2024

• A Time-of-flight and radar dataset of a neonatal thorax simulator with synchronized reference sensor signals for respiratory rate detection
  Gleichauf, Johanna; Herrmann, Sven; Niebler, Christine; Kölpin, Alexander
  Scientific Data 11 (1): 110 (2024-12-01)
  Open Access | Publisher DOI
• Contactless radar-based heart rate estimation in palliative care – a feasibility study and possible use in symptom management
  Grießhammer, Stefan; Malessa, Anke; Lu, Hui; Yip, Julia Beatriz; Leuschner, Julie; Christgau, Florian; Albrecht, Nils Christian; Oesten, Marie; Tran, Thanh Truc; Richer, Robert; Heckel, Maria; Eskofier, Björn; Kölpin, Alexander; Steigleder, Tobias; Ostgathe, Christoph
  BMC Palliative Care 23 (1): 273 (2024-11-30)
  Open Access | Publisher DOI
• Multilayer substrate integrated waveguide six-port junctions with embedded resistive films
  Tegowski, Bartosz; Kölpin, Alexander
  International Journal of Microwave and Wireless Technologies (in Press): (2024)
  Open Access | Publisher DOI
• Near-field scattering phenomena in monostatic radar applications derived from physical optics
  Tegowski, Bartosz; Langer, Dominik; Wenzel, Marvin; Albrecht, Nils Christian; Kölpin, Alexander
  IEEE Transactions on Antennas and Propagation (in Press) (2024)
  Publisher DOI
• Mit Bürgerinnen und Bürgern über Forschung und technische Innovationen in der Palliativversorgung ins Gespräch kommen – Pilotierung eines ELSI-Cafés
  Öhl, Natalie; Weisser, A.; Ott, Tabea; Grießhammer, Stefan; Yip, J.; Klinger, I.; Kölpin, Alexander; Miehling, J.; Bräuning, J.; Dabrock, Peter; Steigleder, Tobias; Ostgathe, Christoph; Heckel, Maria
  Zeitschrift für Palliativmedizin 25 (5): e4 (2024)
  Publisher DOI
• Soziale Implikationen von Gesundheitstechnologien in der Palliativversorgung – Entwicklung eines konzeptionellen Rahmenwerks
  Öhl, Natalie; Steigleder, Tobias; Hille, Eva Maria; Braun, Matthias; Weisser, A.; Mühlensiepen, F.; Vossiek, Martin; Eskofier, Björn; Kölpin, Alexander; Forbes, C. C.; Ostgathe, Christoph; Heckel, Maria
  Zeitschrift für Palliativmedizin 25 (5): e3 (2024-08-26)
  Publisher DOI
• A six-port-based tracking system for automated landing of fixed-wing UAVs
  Hübner, Kai Christian; Tegowski, Bartosz; Kölpin, Alexander
  25th International Microwave and Radar Conference (MIKON 2024)
  Publisher DOI
• Nonlinear distortion effects of vibration-sensing interferometric radar systems due to self-RCS
  Tegowski, Bartosz; Kölpin, Alexander
  25th International Microwave and Radar Conference (MIKON 2024)
  Publisher DOI
• A circular switched parasitic array with directors for LoRa applications at 868 MHz
  Reinhold, Lukas; Wasle, Casper; Kölpin, Alexander
  Electronics Letters 60 (13): e13247 (2024-07-08)
  Open Access | Publisher DOI
• EmRad: ubiquitous vital sign sensing using compact continuous-wave radars
  Albrecht, Nils Christian; Langer, Dominik; Krauss, Daniel; Richer, Robert; Abel, Luca; Eskofier, Bjoern M.; Rohleder, Nicolas; Kölpin, Alexander
  IEEE Open Journal of Engineering in Medicine and Biology 5: 725-734 (2024-06-28)
  Open Access | Publisher DOI
• Print! Place! Perform! : additively manufactured surface-mounted bandpass filter in X band
  Tegowski, Bartosz; Langer, Dominik; Sieganschin, Anton; Wenzel, Marvin; Kölpin, Alexander
  IEEE Microwave Magazine 25 (6): 80-87 (2024-06-01)
  Publisher DOI
• A fully integrated radar-based true-speed-over-ground sensor for highly dynamic road vehicles
  Albrecht, Nils Christian; Langer, Dominik; Kölpin, Alexander
  IEEE MTT-S International Microwave Symposium, IMS 2024: 398-401
  Publisher DOI
• Integration approach for radar transceiver MMICs with integrated antennas enabling adaptability to customized passive frontend design
  Langer, Dominik; Albrecht, Nils Christian; Bartels, Frederike; Tegowski, Bartosz; Kölpin, Alexander
  IEEE MTT-S International Microwave Symposium, IMS 2024: 406-410
  Publisher DOI
• A review and tutorial on machine learning-enabled radar-based biomedical monitoring
  Krauss, Daniel; Engel, Lukas; Ott, Tabea; Braeunig, Johanna; Richer, Robert; Gambietz, Markus; Albrecht, Nils Christian; Hille Eva Maria; Ullmann, Ingrid; Braun, Matthias; Dabrock, Peter; Kölpin, Alexander; Koelewijn, Anne D.; Eskofier, Björn; Vossiek, Martin
  IEEE Open Journal of Engineering in Medicine and Biology 5: 680-699 (2024)
  Publisher DOI
• A hybrid-integrated K-/ Ka-band phased array module with dual-polarized shared aperture
  Erkelenz, Kevin; Sielck, Noah; Kölpin, Alexander; Jacob, Arne
  IEEE Transactions on Microwave Theory and Techniques 72 (10): 6130-6139 (2024)
  Publisher DOI
• A modular 61 GHz vital sign sensing radar system for long-term clinical studies
  Wenzel, Marvin; Langer, Dominik; Kölpin, Alexander; Lurz, Fabian
  2024 IEEE Radio and Wireless Week, RWW 2024 - 2024 IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNeT 2024. - Piscataway, NJ, 2024. - Seite 18-21
  Publisher DOI
• Accuracy limitations of interferometric radar owing to the radar cross section of its antenna
  Tegowski, Bartosz; Kölpin, Alexander
  IEEE Transactions on Microwave Theory and Techniques 72 (7): 4317-4324 (2024)
  Publisher DOI
• Contactless transition for wideband double-ridge waveguides
  Jabi, Omar; Weiß, Nico; Riemschneider, Georg Frederik; Riedinger, Ralf; Kölpin, Alexander
  GeMiC 2024 • March 11–13, 2024, Duisburg, Germany. - Piscataway, NJ, 2024. - Seite 163-166
  Publisher DOI
• Empirical study on the antenna-dependent accuracy of continuous-wave radars
  Tegowski, Bartosz; Schulz, Björn; Kölpin, Alexander
  GeMiC 2024 • March 11–13, 2024, Duisburg, Germany. - Piscataway, NJ, 2024. - Seite 105-108
  Publisher DOI
• Width-constrained multilayer SIW components based on adjoined folded SIW transitions
  Tegowski, Bartosz; Jaschke, Thomas; Sieganschin, Anton; Jacob, Arne; Kölpin, Alexander
  GeMiC 2024 • March 11–13, 2024, Duisburg, Germany. - Piscataway, NJ, 2024. - Seite 148-151
  Publisher DOI

2023

• Non-invasive determination of the mass flow rate for particulate solids using microwaves
  Zoad, Amrit; Kölpin, Alexander; Penirschke, Andreas
  Sensors 23 (24): 9821 (2023)
  Open Access | Publisher DOI
• Active Aperture-Shared Phased Array with Dual Polarization Operating at K/Ka-Band
  Sielck, Noah; Zitzmann, Matthias; Erkelenz, Kevin; Sieganschin, Anton; Kölpin, Alexander; Jacob, Arne
  Asia-Pacific Microwave Conference Proceedings (APMC 2023)
  Publisher DOI
• High-accuracy true speed-over-ground measurement approaches for rail vehicles : comparison of highly accurate state of the art true speed-over-ground measurement approaches for rail vehicles
  Reissland, Torsten; Weigel, Robert; Kölpin, Alexander; Lurz, Fabian
  IEEE Microwave Magazine 24 (12): 60-73 (12-2023)
  Publisher DOI
• A heterodyne transceiver for hybrid-integrated K-/Ka-Band phased arrays
  Erkelenz, Kevin; Goeppert, Florian; Sielck, Noah; Kölpin, Alexander; Jacob, Arne
  53rd European Microwave Conference (EuMC 2023)
  Publisher DOI
• Characterization of the influence of clothing and other materials on human vital sign sensing using mmWave radar
  Albrecht, Nils Christian; Weiland, Jan Philipp; Langer, Dominik; Wenzel, Marvin; Kölpin, Alexander
  53rd European Microwave Conference (EuMC 2023)
  Publisher DOI
• Contactless in-bed movement in various scales classification with CW radar
  Lu, Hui; Wenzel, Marvin; Steigleder, Tobias; Klinger, Isabell; Ostgathe, Christoph; Kölpin, Alexander
  20th European Radar Conference (EuRAD 2023)
  Publisher DOI
• Influence of the communication environment on orbital angular momentum (OAM) mode orthogonality
  Wulff, Michael; Wang, Lei; Kölpin, Alexander; Schuster, Christian
  53rd European Microwave Conference (EuMC 2023)
  Publisher DOI
• Metamaterial waveguide based detector for mass-flow measurements of particulate paint solids
  Zoad, Amrit; Kölpin, Alexander; Penirschke, Andreas
  53rd European Microwave Conference (EuMC 2023)
  Publisher DOI
• The Design Process for Monolithically Manufactured Millimeter-Wave Antenna Arrays Using Stereolithography 3D Printing
  Langer, Dominik; Tegowski, Bartosz; Albrecht, Nils Christian; Wenzel, Marvin; Kölpin, Alexander
  IEEE/MTT-S International Microwave Symposium (IMS 2023)
  Publisher DOI
• Mobile-BAT - A novel ultra-low power wildlife tracking system
  Erhardt, Stefan; Koch, Martin; Kiefer, Andreas; Veith, Michael; Weigel, Robert; Kölpin, Alexander
  Sensors 23 (11): 5236 (2023-05-31)
  Open Access | Publisher DOI
• Sensor fusion for the robust detection of facial regions of neonates using neural networks
  Gleichauf, Johanna; Hennemann, Lukas; Fahlbusch, Fabian; Hofmann, Oliver; Niebler, Christine; Kölpin, Alexander
  Sensors 23 (10): 4910 (2023)
  Open Access | Publisher DOI
• Miniaturization of folded circular SIW cavity filters
  Sieganschin, Anton; Tegowski, Bartosz; Kölpin, Alexander; Jacob, Arne
  International journal of microwave and wireless technologies 15 (6): 993-1000 (2023-05-05)
  Open Access | Publisher DOI
• Antenna Phase Center Determination Using a Six-Port-Based Direction-of-Arrival Detector
  Tegowski, Bartosz; Wenzel, Marvin; Kölpin, Alexander
  IEEE Transactions on Antennas and Propagation 71 (5): 4007-4016 (2023-05-01)
  Publisher DOI
• A Compact Stacked SIW Six-Port Junction
  Tegowski, Bartosz; Kölpin, Alexander
  IEEE Microwave and Wireless Technology Letters 33 (5): 515-518 (2023-05)
  Publisher DOI
• Catch Your Breath! Vital Sign Sensing With Radar
  Wenzel, Marvin; Albrecht, Nils Christian; Langer, Dominik; Heyder, Markus; Kölpin, Alexander
  IEEE Microwave Magazine 24 (3): 75-82 (2023)
  Publisher DOI
• Heart Sound Detection Using an Ultra-Wideband FMCW Radar
  Wenzel, Marvin; Kölpin, Alexander; Tegowski, Bartosz; Albrecht, Nils Christian; Langer, Dominik
  IEEE/MTT-S International Microwave Symposium (IMS 2023)
  Publisher DOI
• A novel method for determining the degree of hydrogen loading of LOHC using cavity based permittivity measurements
  Weiß, Nico; Kölpin, Alexander; Wiemann, Irina; Schluecker, Eberhard
  IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNeT 2023)
  Publisher DOI
• Accurate heart beat detection with doppler radar using bidirectional GRU network
  Lu, Hui; Heyder, Markus; Wenzel, Marvin; Albrecht, Nils Christian; Langer, Dominik; Kölpin, Alexander
  IEEE Radio and Wireless Symposium (RWS 2023)
  Publisher DOI
• Long-distance heart sound detection using 122 GHz CW radar with 3D printed high-gain antennas
  Albrecht, Nils Christian; Heyer, Markus; Wenzel, Marvin; Langer, Dominik; Lu, Hui; Kölpin, Alexander
  IEEE Radio and Wireless Symposium (RWS 2023)
  Publisher DOI
• Theoretical Limits and Interpolation based Improvements of a Correlation Based True-Speed-Over-Ground Estimation
  Reissland, Torsten; Weigel, Robert; Kölpin, Alexander; Lurz, Fabian
  IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNeT 2023)
  Publisher DOI
• A planar polarization-agile array with shared aperture at K/Ka-band
  Sielck, Noah; Erkelenz, Kevin; Kölpin, Alexander; Jacob, Arne
  53rd European Microwave Conference (EuMC 2023)
  Publisher DOI
• Compact SIW six-port with improved output matching and isolation
  Tegowski, Bartosz; Kölpin, Alexander
  53rd European Microwave Conference (EuMC 2023)
  Publisher DOI

2022

• Analysis of onboard channel measurements for train communication scenarios in the context towards 6G enabling technologies
  Lichtblau, Johann; Elkholy, Kariem; Kölpin, Alexander
  52nd European Microwave Conference (EuMC 2022)
  Publisher DOI
• Asymmetric Dual-Mode FSIW Filters with High Stopband Rejection
  Erkelenz, Kevin; Sielck, Noah; Sieganschin, Anton; Kölpin, Alexander; Jacob, Arne
  24th International Microwave and Radar Conference (MIKON 2022)
  Publisher DOI
• Broadband Circuit Board Interconnects Based on Anisotropic Conductive Adhesives
  Erkelenz, Kevin; Sielck, Noah; Kölpin, Alexander; Jacob, Arne
  52nd European Microwave Conference (EuMC 2022)
  Publisher DOI
• Higher-Order Filters With Folded Circular SIW Cavities
  Sieganschin, Anton; Tegowski, Bartosz; Kölpin, Alexander; Jacob, Arne
  24th International Microwave and Radar Conference (MIKON 2022)
  Publisher DOI
• Measurement setup for industrial communication techniques under electromagnetic interference
  Schaffenroth, Sebastian; Schmidt, Hans Peter; Kölpin, Alexander
  17th IEEE Sensors Applications Symposium (SAS 2022)
  Publisher DOI
• Self-Diplexing. Dual-Polarized Ka-Band SIW Slot Antenna with Integrated K-Band Patch
  Sielck, Noah; Schwiers, Till; Erkelenz, Kevin; Kölpin, Alexander; Jacob, Arne
  German Microwave Conference (GeMiC 2022)
  
• Phase noise measurements for L-band applications at attosecond resolution
  Springer, Louise; Ludwig, Frank; Mavrič, Uroš; Vasylyuk, Volodymyr; Pryschelski, Heinrich; Hoffmann, Matthias; Schlarb, Holger; Kölpin, Alexander; Jacob, Arne
  IEEE Transactions on Instrumentation and Measurement 71: 8003307 (2022)
  Publisher DOI
• A V-band Low-Power and Compact Down-Conversion Mixer with Low LO Power in 130-nm SiGe BiCMOS Technology
  Sutbas, Batuhan; Jalli Ng, Herman; Wessel, Jan; Kölpin, Alexander; Kahmen, Gerhard
  16th European Microwave Integrated Circuits Conference (EuMIC 2021) (2022)
  Publisher DOI
• Experimental analysis of frequency inverter noise on single pair Ethernet communication
  Schaffenroth, Sebastian; Schmidt, Hans Peter; Kölpin, Alexander
  IEEE International Workshop on Factory Communication Systems (WFCS 2022)
  Publisher DOI
• Towards a multisensor station for automated biodiversity monitoring
  Wägele, Johann Wolfgang; Bodesheim, Paul; Bourlat, Sarah J.; Denzler, Joachim; Diepenbroek, Michael; Fonseca, Vera G.; Frommolt, Karl-Heinz; Geiger, Matthias F.; Gemeinholzer, Birgit; Glöckner, Frank Oliver; Haucke, Timm; Kirse, Ameli Kim; Kölpin, Alexander; Kostadinov, Ivaylo; Kühl, Hjalmar S.; Kurth, Frank; Lasseck, Mario; Liedke, Sascha; Losch, Florian; Müller, Sandra; Petrovskaya, Natalia; Piotrowski, Krzysztof; Radig, Bernd; Scherber, Christoph; Reinhold, Lukas; Schulz, Jan; Steinhage, Volker; Tschan, Georg Florian; Vautz, Wolfgang; Velotto, Domenico; Weigend, Maximilian; Wildermann, Stefan
  Basic and Applied Ecology 59: 105-138 (2022)
  Open Access | Publisher DOI
• Influence of Self-Interference in a Radar System for a Correlation Based True-Speed-Over-Ground Estimation Approach
  Reissland, Torsten; Michler, Fabian; Weigel, Robert; Kölpin, Alexander; Lurz, Fabian
  IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNeT 2022)
  Publisher DOI
• A lightweight robust approach for automatic heart murmurs and clinical outcomes classification from phonocardiogram recordings
  Lu, Hui; Yip, Julia Beatriz; Steigleder, Tobias; Grießhammer, Stefan; Heckel, Maria; Jami, Naga Venkata Sai Jitin; Eskofier, Björn; Ostgathe, Christoph; Kölpin, Alexander
  Computing in Cardiology 49 (Sept.): 165 (2022)
  Publisher DOI
• Influence of sensor position and body movements on radar-based heart rate monitoring
  Herzer, Liv; Mücke, Annika; Richer, Robert; Albrecht, Nils Christian; Heyder, Markus; Jäger, Katharina M.; König, Veronika; Kölpin, Alexander; Rohleder, Nicolas; Eskofier, Björn
  IEEE-EMBS International Conference on Biomedical and Health Informatics (BHI 2022)
  Publisher DOI

2021

• Welcome to IEEE Radio & Wireless Week 2022 [RWW 2022]
  Chuang, Kevin; Kölpin, Alexander
  IEEE Microwave Magazine 22 (12): 26-27 (2021-12-01)
  Publisher DOI
• Radiation-tolerant all-digital PLL/CDR with varactorless LC DCO in 65 nm CMOS
  Biereigel, Stefan; Kulis, Szymon; Moreira, Paulo Rodrigues Simoes; Kölpin, Alexander; Leroux, Paul; Prinzie, Jeffrey
  Electronics 10 (22): 2741 (2021)
  Open Access | Publisher DOI
• Postprocessing and Evaluation for a Radar-Based True-Speed-Over-Ground Estimation System
  Reissland, Torsten; Michler, Fabian; Scheiner, Benedict; Kölpin, Alexander; Weigel, Robert
  IEEE Microwave and Wireless Components Letters 31 (11): 1251-1254 (2021-11-01)
  Publisher DOI
• Single-event effect responses of integrated panar inductors in 65 nm CMOS
  Biereigel, Stefan; Kulis, Szymon; Leroux, Paul; Moreira, Paulo Rodrigues Simoes; Kölpin, Alexander; Prinzie, Jeffrey
  IEEE Transactions on Nuclear Science 68 (11): 2587-2597 (2021)
  Open Access | Publisher DOI
• Mitigation of Coloured Impulsive noise in OFDM receiver
  Schaffenroth, Sebastian; Schmidt, Hans Peter; Kölpin, Alexander
  IEEE International Symposium on Power Line Communications and its Applications (ISPLC 2021)
  Publisher DOI
• A Digital Correction Method for Increased Dynamic Range in Interferometric Six-Port Radars
  Krause, Sven; Michler, Fabian; Kölpin, Alexander; Rudolph, M.; Heinrich, Wolfgang
  IEEE Microwave and Wireless Components Letters 31 (8): (2021-08)
  Publisher DOI
• Multibeam antenna array and software switching for low-complexity low-cost GNSS beamforming
  Sengupta, Nabanita; Rossouw Van Der Merwe, J.; Kölpin, Alexander; Rugamer, Alexander; Kuhl, Matthias; Felber, Wolfgang
  International Conference on Localization and GNSS (ICL-GNSS 2021)
  Publisher DOI
• Automated non-contact respiratory rate monitoring of neonates based on synchronous evaluation of a 3D time-of-flight camera and a microwave interferometric radar sensor
  Gleichauf, Johanna; Herrmann, Sven; Hennemann, Lukas; Krauss, Hannes; Nitschke, Janina; Renner, Philipp; Niebler, Christine; Kölpin, Alexander
  Sensors 21 (9): 2959 (2021-05-01)
  Open Access | Publisher DOI
• A V-Band Low-Power Compact LNA in 130-nm SiGe BiCMOS Technology
  Sutbas, Batuhan; Jalli Ng, Herman; Wessel, Jan; Kölpin, Alexander; Kahmen, Gerhard
  IEEE Microwave and Wireless Components Letters 31 (5): 9366489 (2021-05)
  Publisher DOI
• Low-cost six-port for high-volume frequency measurement systems in the 2.4 GHz ISM-Band
  Scheiner, Benedict; Probst, Florian; Michler, Fabian; Weigel, Robert; Kölpin, Alexander; Lurz, Fabian
  IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNeT 2021)
  Publisher DOI
• Implementation and Assessment of a Radar Based True-Speed-Over-Ground Estimation Approach Utilizing Complex-Valued Correlation
  Reissland, Torsten; Michler, Fabian; Weigel, Robert; Kölpin, Alexander; Lurz, Fabian
  18th European Radar Conference (EuRAD 2021)
  Publisher DOI
• Low-Power Ka- and V-Band Miller Compensated Amplifiers in 130-nm SiGe BiCMOS Technology
  Sutbas, Batuhan; Jalli Ng, Herman; Wessel, Jan; Kölpin, Alexander; Kahmen, Gerhard
  16th European Microwave Integrated Circuits Conference (EuMIC 2021)
  Publisher DOI
• Miniaturized hybrid frequency reader for contactless measurement scenarios using resonant surface acoustic wave sensors
  Scheiner, Benedict; Probst, Florian; Michler, Fabian; Weigel, Robert; Kölpin, Alexander; Lurz, Fabian
  Sensors 21 (7): 2367 (2021-03-29)
  Open Access | Publisher DOI
• Radiation hardness assurance through system-level testing: risk acceptance, facility requirements, test methodology, and data exploitation
  Coronetti, Andrea; Alía, Rubén Garcia; Budroweit, Jan; Rajkowski, Tomasz; Da Costa Lopes, Israel; Niskanen, Kimmo; Söderström, Daniel; Cazzaniga, Carlo; Ferraro, Rudy; Danzeca, Salvatore; Mekki, Julien; Manni, Florent; Dangla, David; Virmontois, Cedric; Kerboub, Nourdine; Kölpin, Alexander; Saigne, Frederic; Wang, Pierre; Pouget, Vincent; Touboul, Antoine; Javanainen, Arto; Kettunen, Heikki; Germanicus, Rosine
  IEEE Transactions on Nuclear Science 68 (5): 9360625, 958-969 (2021-05-01)
  Open Access | Publisher DOI
• Contactless analysis of heart rate variability during cold pressor test using radar interferometry and bidirectional LSTM networks
  Shi, Kilin; Steigleder, Tobias; Schellenberger, Sven; Michler, Fabian; Malessa, Anke; Lurz, Fabian; Rohleder, Nicolas; Ostgathe, Christoph; Weigel, Robert; Kölpin, Alexander
  Scientific Reports 11 (1): 3025 (2021-12-01)
  Open Access | Publisher DOI
• Micrometer Sensing With Microwaves: Precise Radar Systems for Innovative Measurement Applications
  Michler, Fabian; Scheiner, Benedict; Reissland, Torsten; Weigel, Robert; Kölpin, Alexander
  IEEE Journal of Microwaves 1 (1): 202-217 (2021-01-01)
  Publisher DOI
• PAWR 2021 Committees
  Carvalho, B.; Chuang, Kevin; Kölpin, Alexander
  IEEE Topical Conference on RF/Microwave Power Amplifiers for Radio and Wireless Applications (PAWR 2021)
  Publisher DOI
• Ultra-Low Power Radar Based Presence Detection
  Lurz, Fabian; Kölpin, Alexander
  European Microwave Week (EuMW 2021), Workshop on Advanced mm-Wave Radar System Solutions for Industrial and Consumer Sensing
  

2020

• Low-profile and low-cost transmitarray antenna at 122 GHz based on unit-cells with 1-bit phase resolution
  Frank, Martin; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  Electronics Letters 24 (56): 1293-1295 (2020-11-26)
  Publisher DOI
• RWW 2021 technical program chair's message
  Kölpin, Alexander
  IEEE Microwave Magazine 12 (21): 9250340, 16-17 (2020-12-01)
  Publisher DOI
• Continuous In-Bed Monitoring of Vital Signs Using a Multi Radar Setup for Freely Moving Patients
  Schellenberger, Sven; Shi, Kilin; Michler, Fabian; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  Sensors 20 (20): 5827 (2020)
  Open Access | Publisher DOI
• Rotary Coupler in Microstrip Line Design for Data Transmission in the 2.45GHz ISM Band
  Scheiner, Benedict; Beck, Christopher; Lurz, Fabian; Frank, Martin; Michler, Fabian; Weigel, Robert; Kölpin, Alexander
  23rd International Microwave and Radar Conference (MIKON 2020)
  Publisher DOI
• A highly adaptable ultra-low weight wireless sensor network for tracking and monitoring of airborne vertebrates
  Duda, Niklas; Weigel, Robert; Kölpin, Alexander
  23rd International Microwave and Radar Conference (MIKON 2020)
  Publisher DOI
• Low-Weight Wireless Sensor Node With Sensor-Data-Enhanced Dual-Frequency RSSI-Based Distance Estimation
  Duda, Niklas; Weigel, Robert; Kölpin, Alexander
  IEEE Transactions on Microwave Theory and Techniques 10 (68): 9095234 (2020-10)
  Publisher DOI
• An automatic gain and offset control circuit for DC-Coupled continuous-wave radar systems
  Michler, Fabian; Schoenhaerl, Stefan; Schellenberger, Sven; Shi, Kilin; Scheiner, Benedict; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE MTT-S International Microwave Symposium (2020)
  Publisher DOI
• Automatic non-contact monitoring of the respiratory rate of neonates using a structured light camera
  Gleichauf, Johanna; Niebler, Christine; Kölpin, Alexander
  Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBS 2020)
  Publisher DOI
• IEEE Radio and Wireless Week 2020 [Conference Report]
  Caverly, Robert H.; Carvalho, B.; Chuang, Kevin; Kölpin, Alexander; Maune, Holger
  IEEE Microwave Magazine 21 (6): 9084310 (2020-06)
  Publisher DOI
• Thinking small: Next-generation sensor networks close the size gap in vertebrate biologging
  Ripperger, Simon P.; Carter, Gerald G.; Page, Rachel A.; Duda, Niklas; Kölpin, Alexander; Weigel, Robert; Hartmann, Markus; Nowak, Thorsten; Thielecke, Jörn; Schadhauser, Michael; Robert, Joerg; Herbst, Sebastian; Meyer-Wegener, Klaus; Wägemann, Peter; Schröder-Preikschat, Wolfgang; Cassens, Björn; Kapitza, Rüdiger; Dressler, Falko; Mayer, Frieder
  PLoS Biology 18 (4): e3000655 (2020-04-01)
  Publisher DOI
• Channel Measurements for the Evaluation of Evolving Next Generation Wireless Railway Communication Applications
  Elkholy, Kariem; Lichtblau, Johann; Reissland, Torsten; Weigel, Robert; Kölpin, Alexander
  German Microwave Conference, GeMIC: 9080239 (2020-03)
  
• Measurement Platform for Physical-Layer Analysis of Industrial and Automotive Ethernet
  Gercikow, Alexander; Schaffenroth, Sebastian; Schmidt, Hans Peter; Kölpin, Alexander
  IEEE Sensors Applications Symposium (SAS 2020)
  Publisher DOI
• Methods for clock signal characterization using FPGA resources
  Biereigel, Stefan; Kulis, Szymon; Moreira, Paulo Rodrigues Simoes; Prinzie, Jeffrey; Leroux, Paul; Kölpin, Alexander
  Journal of Instrumentation 3 (15): P03012 (2020-03)
  Publisher DOI
• A dataset of clinically recorded radar vital signs with synchronised reference sensor signals
  Schellenberger, Sven; Shi, Kilin; Steigleder, Tobias; Malessa, Anke; Michler, Fabian; Hameyer, Laura; Neumann, Nina; Lurz, Fabian; Weigel, Robert; Ostgathe, Christoph; Kölpin, Alexander
  Scientific Data 1 (7): Article No. 291 (2020)
  Open Access | Publisher DOI
• A dataset of radar-recorded heart sounds and vital signs including synchronised reference sensor signals
  Shi, Kilin; Schellenberger, Sven; Will, Christoph; Steigleder, Tobias; Michler, Fabian; Fuchs, Jonas Benjamin; Weigel, Robert; Ostgathe, Christoph; Kölpin, Alexander
  Scientific data 1 (7): Article No. 50 (2020)
  Open Access | Publisher DOI
• Heavy ion induced single event effects characterization on an RF-agile transceiver for flexible multi-band radio systems in newspace avionics
  Budroweit, Jan; Jaksch, Mattis; Alía, Rubén Garcia; Coronetti, Andrea; Kölpin, Alexander
  Aerospace 7 (2): 14 (2020-02-01)
  Publisher DOI
• Low-Weight Noninvasive Heart Beat Detector for Small Airborne Vertebrates
  Duda, Niklas; Ripperger, Simon; Mayer, Frieder; Weigel, Robert; Kölpin, Alexander
  IEEE Sensors Letters 2 (4): 8984242 (2020-02)
  Publisher DOI
• Universal low-cost transmitarray antenna design at 61 GHz for beam steering with different feed antennas
  Frank, Martin; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  International ITG Workshop on Smart Antennas (WSA 2020)
  
• An Automatic Detection and Data Downlink System for Miniature Bat Loggers
  Erhardt, Stefan; Koller, Josef; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS: 247-250 (2020-01)
  Publisher DOI
• An Ultra Broadband Multi-Tone Six-Port Radar for Distance Measurements in K-Band Waveguides
  Heining, Simon; Michler, Fabian; Scheiner, Benedict; Hassan, Emadeldeen; Kölpin, Alexander; Weigel, Robert; Lurz, Fabian
  IEEE Radio and Wireless Symposium, RWS: 9050025 (2020)
  Publisher DOI
• Miniaturized Ultra-Wideband Antenna Design for Human Implants
  Frank, Matthias; Lurz, Fabian; Kempf, Markus; Rober, Jürgen; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS : 9050119 48-51-51 (2020-01)
  Publisher DOI
• A Radar-Based Vital Sign Sensing System for In-Bed Monitoring in Clinical Applications
  Michler, Fabian; Shi, Kilin; Schellenberger, Sven; Lenhard, Thilo; Dassel, Florian; Scheiner, Benedict; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  Proceedings of the 2020 German Microwave Conference, GeMIC : 9080218 (2020)
  
• Automatic Signal Quality Index Determination of Radar-Recorded Heart Sound Signals Using Ensemble Classification.
  Shi, Kilin; Schellenberger, Sven; Michler, Fabian; Steigleder, Tobias; Malessa, Anke; Lurz, Fabian; Ostgathe, Christoph; Weigel, Robert; Kölpin, Alexander
  IEEE Transactions on Biomedical Engineering 3 (67): 8731709 (2020)
  Publisher DOI
• Design and Assembly of Miniature Long-Term Trackers for Migrating Bats
  Erhardt, Stefan; Tost, F.; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  GeMIC - German Microwave Conference: 9080178 (2020)
  
• Low-cost direction-of-arrival measurements using multiplexed antenna switching
  Dorn, Christian; Erhardt, Stefan; Weigel, Robert; Kölpin, Alexander; Lurz, Fabian
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNeT: 9037602 (2020)
  Publisher DOI
• Nothing Beats SNR: Single-Digit Micrometer Ranging Using a Low-Power CW Radar Featuring a Low-Weight 3D-Printed Horn Antenna
  Scheiner, Benedict; Michler, Fabian; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE Microwave Magazine 1 (21): 8913696 (2020)
  Publisher DOI
• On the impact of system nonlinearities in continuous-wave radar systems for vital parameter sensing
  Michler, Fabian; Shi, Kilin; Schellenberger, Sven; Scheiner, Benedict; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks (WiSNeT 2020): 9037603, 13-15 (2020)
  Publisher DOI

2019

• Vampire Bats that Cooperate in the Lab Maintain Their Social Networks in the Wild
  Ripperger, Simon; Carter, Gerald G.; Duda, Niklas; Kölpin, Alexander; Cassens, Björn; Kapitza, Rüdiger; Josic, Darija; Berrío-Martínez, Jineth; Page, Rachel A.; Mayer, Frieder
  Current Biology 23 (29): 4139-4144.e4 (2019-12-02)
  Publisher DOI
• Frequency readjustment of excitation signals for resonant surface acoustic wave sensors in the 2.45 GHz ISM band
  Scheiner, Benedict; Lurz, Fabian; Michler, Fabian; Weigel, Robert; Kölpin, Alexander
  Asia-Pacific Microwave Conference Proceedings, APMC (2019-December): 9038210 (2019)
  Publisher DOI
• Sensor enhanced dual frequency RSSI distance estimation for low weight wireless sensor nodes
  Duda, Niklas; Weigel, Robert; Kölpin, Alexander
  Asia-Pacific Microwave Conference Proceedings, APMC: 9038327 (2019-12)
  Publisher DOI
• Support Vector Machine-Based Instantaneous Presence Detection for Continuous Wave Radar Systems
  Schellenberger, Sven; Shi, Kilin; Steigleder, Tobias; Michler, Fabian; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  Asia-Pacific Microwave Conference Proceedings, APMC: 1465-1467 (2019-12)
  Publisher DOI
• Characterization of the Wireless Onboard Channel during Tunnel Crossing in High-Speed Rail Traffic
  Lichtblau, Johann; Lurz, Fabian; Sanftl, Benedikt; Weigel, Robert; Kölpin, Alexander
  SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC 2019)
  Publisher DOI
• Low-Cost Transmitarray Antenna Designs in V-Band based on Unit-Cells with 1 Bit Phase Resolution
  Frank, Martin; Scheiner, Benedict; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  Frequenz 73 (11-12) : (2019-10-18)
  Publisher DOI
• Squircle-Based Calibration Algorithm for Six-Port Radar
  Linz, Sarah; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE Transactions on Microwave Theory and Techniques 10 (67): 8798881 (2019-10-01)
  Publisher DOI
• Synchronization approaches and improvements for a low-complexity power line communication system
  Reisslan, Torsten; Kuba, Matthias; Rober, Jörg; Kölpin, Alexander; Weigel, Robert; Lurz, Fabian
  IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids, SmartGridComm: 8909724 (2019-10-01)
  Publisher DOI
• An open-source speech codec at 450 bit/s with pseudo-wideband mode
  Erhardt, Stefan; Kurin, T.; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  European Radar Conference, EuRAD: 8904470 (2019-10)
  
• Wireless Composite Right/Left-Handed Transmission Line Sensor for Permittivity Measurements
  Zoad, Amrit; Kölpin, Alexander; Penirschke, Andreas
  European Microwave Conference, EuMC: 8910839 (2019-10)
  Publisher DOI
• In-situ testing of a multi-band software-defined radio platform in a mixed-field irradiation environment
  Budroweit, Jan; Mueller, Steffen; Jaksch, Mattis; Alía, Rubén Garcia; Coronetti, Andrea; Kölpin, Alexander
  Aerospace 10 (6): 106, 1-12 (2019)
  Open Access | Publisher DOI
• An Ensemble LSTM Architecture for Clinical Sepsis Detection
  Schellenberger, Sven; Shi, Kilin; Wiedemann, Jan Philipp; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  Computing in Cardiology : 9005457 (2019-09-01)
  Publisher DOI
• Development of a novel channel model for train-onboard communication in commuter traffic at 100 km/h
  Lichtblau, Johann; Lurz, Fabian; Sanftl, Benedikt; Weigel, Robert; Kölpin, Alexander
  Kleinheubach Conference, KHB: 8890196 (2019-09-01)
  
• Evaluation of a robust correlation-based true-speed-over-ground measurement system employing a FMCW radar
  Reissland, Torsten; Lenhart, Bjoern; Lichtblau, Johann; Sporer, Michael; Weigel, Robert; Kölpin, Alexander
  International Journal of Microwave and Wireless Technologies 7 (11): 686-693 (2019-09)
  Publisher DOI
• Respiration Extraction from Radar Heart Sound Measurements
  Schellenberger, Sven; Shi, Kilin; Michler, Fabian; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference: 6533-6536 (2019-07-01)
  Publisher DOI
• An Error Compensation Algorithm for Indirect Resonant Planar Relative Permittivity Sensor Principles up to 100 GHz
  Lau, Isabella; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications, IMWS-AMP, IEEE MTT-S: 8880090 (2019-07)
  Publisher DOI
• Influence of the PCB Manufacturing Process on the Measurement Error of Planar Relative Permittivity Sensors Up to 100 GHz
  Lau, Isabella; Hajian, Ali; Michler, Fabian; Gold, Gerald; Lurz, Fabian; Schmid, Ulrich; Helmreich, Klaus; Weigel, Robert; Kölpin, Alexander
  IEEE Transactions on Microwave Theory and Techniques 7 (67): 8698275 (2019-07)
  Publisher DOI
• Segmentation of Radar-Recorded Heart Sound Signals Using Bidirectional LSTM Networks
  Shi, Kilin; Schellenberger, Sven; Weber, Leon; Wiedemann, Jan Philipp; Michler, Fabian; Steigleder, Tobias; Malessa, Anke; Lurz, Fabian; Ostgathe, Christoph; Weigel, Robert; Kölpin, Alexander
  Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS: 8857863 (2019-07)
  Publisher DOI
• Simultaneous inductive power and data transmission system for smart applications
  Trautmann, Martin; Sanftl, Benedikt; Weigel, Robert; Kölpin, Alexander
  IEEE Circuits and Systems Magazine 3 (19): 8792433 (2019-07)
  Publisher DOI
• Wireless Sensor Platform for Detection of Vital Parameters of Bats
  Duda, Niklas; Ripperger, Simon; Tschapka, Marco; Mayer, Frieder; Weigel, Robert; Kölpin, Alexander
  Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS: 8856769 (2019-07)
  Publisher DOI
• A clinically evaluated interferometric continuous-wave radar system for the contactless measurement of human vital parameters
  Michler, Fabian; Shi, Kilin; Schellenberger, Sven; Steigleder, Tobias; Malessa, Anke; Hameyer, Laura; Neumann, Nina; Lurz, Fabian; Ostgathe, Christoph; Weigel, Robert; Kölpin, Alexander
  Sensors (Switzerland) 11 (19): 2492 (2019-06-01)
  Open Access | Publisher DOI
• Extended ellipse-based reconstruction algorithm for six-port radar
  Linz, Sarah; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS: 8714294 (2019-05-14)
  Publisher DOI
• Measurements for onboard communication in a high-speed train up to 330 km/h for selected scenarios at 2.45 GHz
  Lichtblau, Johann; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS : 8714281 (2019-05-14)
  Publisher DOI
• Phased array approach for vehicle-to-infrastructure communication in train stations
  Lichtblau, Johann; Michler, Fabian; Scheiner, Benedict; Lurz, Fabian; Graebner, Martin; Hundhausen, Mira; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS: 8714204 (2019-05-14)
  Publisher DOI
• Pulse wave velocity detection using a 24 GHz six-port based doppler radar
  Michler, Fabian; Shi, Kilin; Schellenberger, Sven; Scheiner, Benedict; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS: 8714521 (2019-05-14)
  Publisher DOI
• A Small and Lightweight Ultra-Low Power GSM Cell Tracker
  Erhardt, Stefan; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 8711804 (2019-05-09)
  Publisher DOI
• Compressed Sensing Based Near-Field Radar Target Imaging and Localization Employing Normalized Iterative Hard Thresholding
  Reissland, Torsten; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 8711811 (2019-05-09)
  Publisher DOI
• Non-Invasive Low Power ECG for Heart Beat Detection of Bats
  Duda, Niklas; Barthule, Alexander; Ripperger, Simon; Mayer, Frieder; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 8711816 (2019-05-09)
  Publisher DOI
• A composite right/left-handed transmission line sensor for permittivity measurements
  Zoad, Amrit; Kölpin, Alexander; Penirschke, Andreas
  European Microwave Conference in Central Europe, EuMCE: 8874740 (2019-05)
  
• Low-cost Transmitarray Antenna Designs with ±70° Beam Steering Range in V-Band
  Frank, Martin; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  GeMiC 2019 - 2019 German Microwave Conference: 8698118 (2019-04-23)
  Publisher DOI
• Low-power contactless LC-tank based respiratory sensor
  Scheiner, Benedict; Schellenberger, Sven; Shi, Kilin; Heusinger, Elisabeth; Michler, Fabian; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  Electronics Letters 6 (55): 304-306 (2019-03-21)
  Publisher DOI
• Novel Approach for Virtual Coupling of Trains Using Different Modulation and Coding Schemes
  Lichtblau, Johann; Scheiner, Benedict; Michler, Fabian; Graebner, Martin; Sanftl, Benedikt; Weigel, Robert; Kölpin, Alexander
  International Conference on Intelligent Rail Transportation, ICIRT 2018: 8641557 (2019-02-13)
  Publisher DOI
• Proximity sensors on common noctule bats reveal evidence that mothers guide juveniles to roosts but not food
  Ripperger, Simon; Günther, Linus; Wieser, Hanna; Duda, Niklas; Hierold, Martin; Cassens, Björn; Kapitza, Rüdiger; Kölpin, Alexander; Mayer, Frieder
  Biology Letters 2 (15): 20180884 (2019-02-01)
  Publisher DOI
• (Micro)Metering with microwaves: A low-cost, low-power, high-precision radar system
  Michler, Fabian; Scheiner, Benedict; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE Microwave Magazine 1 (20): 8575185 (2019-01-01)
  Publisher DOI
• 122 GHz low-cost substrate integrated waveguide based leaky-wave antenna design
  Frank, Matthias; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS: 8714239 (2019-01)
  Publisher DOI
• An Open-Source Speech Codec at 450 bit/s with Pseudo-Wideband Mode
  Erhardt, Stefan; Kurin, Thomas; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  European Microwave Conference, EuMC : 8910691 (2019)
  Publisher DOI
• Compact low-cost substrate integrated waveguide fed antenna for 122 GHz radar applications
  Frank, Matthias; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  International Journal of Microwave and Wireless Technologies 4 (11): 408-412 (2019)
  Publisher DOI
• Design of a rotary coupler for data transmission on fast rotating mechanical shafts and roboter arms
  Scheiner, Benedict; Lurz, Fabian; Michler, Fabian; Lau, Isabella; Lichtblau, Johann; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS: 8714480 (2019)
  Publisher DOI
• Electronically Reconfigurable 6 × 6 Element Transmitarray at K-Band Based on Unit Cells With Continuous Phase Range
  Frank, Matthias; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE Antennas and Wireless Propagation Letters 4 (18): 8661610 (2019)
  Publisher DOI
• Frequency response characterization of surface acoustic wave resonators using a six-port frequency measurement system
  Scheiner, Benedict; Lurz, Fabian; Michler, Fabian; Weigel, Robert; Kölpin, Alexander
  Kleinheubach Conference, KHB : 8890082 (2019)
  
• In-Situ-Linearization for Instantaneous Frequency Measurement Systems
  Scheiner, Benedict; Lurz, Fabian; Michler, Fabian; Weigel, Robert; Kölpin, Alexander
  European Microwave Conference, EuMC : 8910810 (2019)
  Publisher DOI

2018

• Antenna and Package Design for 61- and 122-GHz Radar Sensors in Embedded Wafer-Level Ball Grid Array Technology
  Frank, Martin; Reissland, Torsten; Lurz, Fabian; Voelkel, Matthias; Lambrecht, Franziska; Kiefl, Stefan; Ghesquiere, Pol; Jalli Ng, Herman; Kissinger, Dietmar; Weigel, Robert; Kölpin, Alexander
  IEEE Transactions on Microwave Theory and Techniques 12 (66): 8515104 (2018-12-01)
  Publisher DOI
• Robust Correlation based True-Speed-over-Ground Measurement System employing a FMCW Radar
  Reissland, Torsten; Lenhart, Bjoern; Lichtblau, Johann; Sporer, Michael; Weigel, Robert; Kölpin, Alexander
  European Radar Conference, EuRAD: 8546663 (2018-11-26)
  Publisher DOI
• An Accurate Free Space Method for Material Characterization in W- Band Using Material Samples with Two Different Thicknesses
  Lau, Isabella; Frank, Martin; Shi, Kilin; Lurz, Fabian; Talai, Armin; Weigel, Robert; Kölpin, Alexander
  European Microwave Conference, EuMC: 8541437 (2018-11-20)
  Publisher DOI
• Enhanced GSM Broadcast Receiver Using the Phase Output of a Sub-GHz Transceiver
  Erhardt, Stefan; Gaede, Bernhard; Weigel, Robert; Kölpin, Alexander
  European Microwave Conference, EuMC: 8541538 (2018-11-20)
  Publisher DOI
• Performance Analysis of an Ultra Wideband Transceiver for Real- Time Localization
  Michler, Fabian; Deniz, Harun; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  European Microwave Conference, EuMC: 8541672 (2018-11-20)
  Publisher DOI
• Six-Port Based Multitone and Low-Power Radar System for Waveguide Measurements in Smart Factories
  Scheiner, Benedict; Lurz, Fabian; Michler, Fabian; Linz, Sarah; Weigel, Robert; Kölpin, Alexander
  European Microwave Conference, EuMC: 8541518 (2018-11-20)
  Publisher DOI
• BATS: adaptive ultra low power sensor network for animal tracking
  Duda, Niklas; Nowak, Thorsten; Hartmann, Markus; Schadhauser, Michael; Cassens, Björn; Wägemann, Peter; Nabeel, Muhammad; Ripperger, Simon; Herbst, Sebastian; Meyer-Wegener, Klaus; Mayer, Frieder; Dressler, Falko; Schröder-Preikschat, Wolfgang; Kapitza, Rüdiger; Robert, Joerg; Thielecke, Jörn; Weigel, Robert; Kölpin, Alexander
  Sensors (Switzerland) 10 (18): 3343 (2018-10-07)
  Open Access | Publisher DOI
• A Resonant Substrate Integrated Waveguide Measurement System for True Relative Permittivity Extraction of PCB Materials up to 90 GHz
  Lau, Isabella; Michler, Fabian; Talai, Armin; Weigel, Robert; Kölpin, Alexander
  IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications, IMWS-AMP : 8457133 (2018-09-06)
  Publisher DOI
• Detecting Respiratory Effort-Related Arousals in Polysomnographic Data Using LSTM Networks
  Schellenberger, Sven; Shi, Kilin; Mai, Melanie; Wiedemann, Jan Philipp; Steigleder, Tobias; Eskofier, Björn; Weigel, Robert; Kölpin, Alexander
  Computing in Cardiology (2018-September): 8744065 (2018-09)
  Publisher DOI
• Status of Six-Port Technology for Wireless Sensing Applications
  Haddadi, Kamel; Loyez, Christophe; Lallemand, Simon; Gong, Shaofang; Kölpin, Alexander
  International Conference on Electromagnetics in Advanced Applications, ICEAA: 8520535 (2018-09)
  Publisher DOI
• Radar-based heart sound detection
  Will, Christoph; Shi, Kilin; Schellenberger, Sven; Steigleder, Tobias; Michler, Fabian; Fuchs, Jonas Benjamin; Weigel, Robert; Ostgathe, Christoph; Kölpin, Alexander
  Scientific Reports 1 (8): 11551 (2018-12-01)
  Open Access | Publisher DOI
• Contactless person identification using cardiac radar signals
  Shi, Kilin; Will, Christoph; Weigel, Robert; Kölpin, Alexander
  IEEE International Instrumentation and Measurement Technology Conference, I2MTC: 1-6 (2018-07-10)
  Publisher DOI
• A review on six-port radar and its calibration techniques
  Linz, Sarah; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  International Microwave and Radar Conference, MIKON: 80-83 (2018-07-05)
  Publisher DOI
• Compact PCB delay line for six-port based instantaneous frequency measurement
  Lurz, Fabian; Scheiner, Benedict; Linz, Sarah; Weigel, Robert; Kölpin, Alexander
  International Microwave and Radar Conference, MIKON: 87-90 (2018-07-05)
  Publisher DOI
• Influence of train interior on train-onboard communication
  Lichtblau, Johann; Sanftl, Benedikt; Kraus, Christian; Weigel, Robert; Kölpin, Alexander
  International Microwave and Radar Conference, MIKON: 605-606 (2018-07-05)
  Publisher DOI
• High-Precision Interferometric Radar for Sheet Thickness Monitoring
  Mann, Sebastian; Will, Christoph; Reissland, Torsten; Lurz, Fabian; Lindner, Stefan; Linz, Sarah; Weigel, Robert; Kölpin, Alexander
  IEEE Transactions on Microwave Theory and Techniques 6 (66): 3153-3166 (2018-06)
  Publisher DOI
• A contactless system for continuous vital sign monitoring in palliative and intensive care
  Shi, Kilin; Will, Christoph; Steigleder, Tobias; Michler, Fabian; Weigel, Robert; Ostgathe, Christoph; Kölpin, Alexander
  Annual IEEE International Systems Conference, SysCon: 1-8 (2018-05-30)
  Publisher DOI
• Reader architectures for wireless surface acoustic wave sensors
  Lurz, Fabian; Ostertag, Thomas; Scheiner, Benedict; Weigel, Robert; Kölpin, Alexander
  Sensors (Switzerland) 6 (18): 1734 (2018-06)
  Open Access | Publisher DOI
• Enhanced mobile node design for small size animal borne wireless sensor nodes with encounter detection and localization
  Duda, Niklas; Weigel, Robert; Kölpin, Alexander
  German Microwave Conference, GeMiC: 123-126 (2018-04-10)
  Publisher DOI
• Fast dual-synthesizer for six-port in-situ linearization in the 2.4 GHz ISM-band
  Scheiner, Benedict; Lurz, Fabian; Michler, Fabian; Lindner, Stefan; Linz, Sarah; Weigel, Robert; Kölpin, Alexander
  German Microwave Conference, GeMiC: 223-226 (2018-04-10)
  Publisher DOI
• Frequency agile filter for image frequency rejection in an adjustable receiver frontend
  Lautenbacher, Thomas; Fischer, Georg; Fehr, Matthias; Weigel, Robert; Kölpin, Alexander
  German Microwave Conference, GeMiC: 138-141 (2018-04-10)
  Publisher DOI
• Circuit design for a radiation tolerant 2.4 GHz synthesizer based on COTS components
  Mueller, Steffen; Och, Andreas; Danzeca, Salvatore; Alía, Rubén Garcia; Brugger, Markus; Weigel, Robert; Kölpin, Alexander
  Topical Workshop on Internet of Space, TWIOS : 3-16 (2018-03-09)
  Publisher DOI
• Design challenges of a highly integrated SDR platform for multiband spacecraft applications in radiation enviroments
  Budroweit, Jan; Kölpin, Alexander
  Topical Workshop on Internet of Space, TWIOS: 9-12 (2018-03-09)
  Publisher DOI
• Low-power frequency synthesizer for multi-tone six-port radar
  Lurz, Fabian; Hofstetter, Patrick; Lindner, Stefan; Linz, Sarah; Michler, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet : 84-87 (2018-03-09)
  Publisher DOI
• Real-time GSM broadcast receiver on a Cortex-M4 microcontroller
  Erhardt, Stefan; Pflaum, Felix; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 55-58 (2018-03-09)
  Publisher DOI
• Ultra-low-power sensor node with wake-up-functionality for smart-sensor-applications
  Pflaum, Felix; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 107-110 (2018-03-09)
  Publisher DOI
• Automation of the Storing-In Part of a Hydrogen-Storage System using Liquid Organic Hydrogen Carriers
  Milella, Vito Oronzo; Kölpin, Alexander; Schluecker, Eberhard
  Energy Technology 3 (6): 547-557 (2018-03-01)
  Publisher DOI
• Design and characterization of antenna arrays in eWLB package for 61 GHz radar applications
  Frank, Martin; Ghesquiere, Pol; Kiefl, Stefan; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS: 14-17 (2018-02-28)
  Publisher DOI
• Examination of OFDM for wireless train-onboard communication
  Lichtblau, Johann; Sanftl, Benedikt; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS: 184-187 (2018-02-28)
  Publisher DOI
• Fully integrated remote radio head and improved data transmission for inductive power transfer systems
  Sanftl, Benedikt; Trautmann, Martin; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS: 174-177 (2018-02-28)
  Publisher DOI
• Microstrip-to-waveguide transition in planar form using a substrate integrated waveguide
  Scheiner, Benedict; Mann, Sebastian; Lurz, Fabian; Michler, Fabian; Erhardt, Stefan; Lindner, Stefan; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS: 18-20 (2018-02-28)
  Publisher DOI
• A planar 24 GHz switched-beam antenna based on Pin diodes for remote sensing applications
  Michler, Fabian; Scheiner, Benedict; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  Asia-Pacific Microwave Conference, APMC (2018): 8617541 (2019-01-16)
  Publisher DOI
• Contactless carotid pulse measurement using continuous wave radar
  Shi, Kilin; Schellenberger, Sven; Steigleder, Tobias; Michler, Fabian; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  Asia-Pacific Microwave Conference Proceedings (APMC 2018)
  Publisher DOI
• Evaluation of ISAR-based autofocus methods for estimation of true-speed-over-ground using a 24 GHz FMCW-Radar
  Reissland, Torsten; Lenhart, Bjoern; Lichtblau, Johann; Sporer, Michael; Kölpin, Alexander; Weigel, Robert
  Asia-Pacific Microwave Conference, APMC: 8617123 (2019-01-16)
  Publisher DOI
• Microw(h)att?! Ultralow-Power Six-Port Radar
  Lurz, Fabian; Michler, Fabian; Scheiner, Benedict; Weigel, Robert; Kölpin, Alexander
  IEEE Microwave Magazine 1 (19): 91-98 (2018)
  Publisher DOI
• Porösizierte Glaskeramik-Substrate für die Radarsensorik
  Talai, Armin; Kölpin, Alexander; Bittner, Achim; Steinhäußer, Frank; Schmid, Ulrich
  Porösizierte Glaskeramik-Substrate für die Radarsensorik. In: Tille T. (eds) Automobil-Sensorik 2. Springer Vieweg, Berlin, Heidelberg (2018)
  Publisher DOI

2017

• Receiving GSM broadcast channels with an ultra-low power sub-GHz transceiver
  Erhardt, Stefan; Weigel, Robert; Kölpin, Alexander
  European Microwave Week, European Microwave Conference, EuMW, EuMC: 380-383 (2017-12-19)
  Publisher DOI
• Zero-bias schottky power detector design for six-port based radar systems
  Michler, Fabian; Lindner, Stefan; Lurz, Fabian; Erhardt, Stefan; Weigel, Robert; Kölpin, Alexander
  European Microwave Week, EuMW, European Microwave Conference, EuMC 2017: 228-231 (2017-12-19)
  Publisher DOI
• A 24 GHz Dual-Polarized and Robust Dielectric Rod Antenna
  Sporer, Michael; Weigel, Robert; Kölpin, Alexander
  IEEE Transactions on Antennas and Propagation 12 (65): 8076919 (2017-12)
  Publisher DOI
• Local pulse wave detection using continuous wave radar systems
  Will, Christoph; Shi, Kilin; Schellenberger, Sven; Steigleder, Tobias; Michler, Fabian; Weigel, Robert; Ostgathe, Christoph; Kölpin, Alexander
  IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology 2 (1): 8082495 (2017-12)
  Publisher DOI
• A 24 GHz waveguide based radar system using an advanced algorithm for I/Q offset cancelation
  Will, Christoph; Linz, Sarah; Mann, Sebastian; Lurz, Fabian; Lindner, Stefan; Weigel, Robert; Kölpin, Alexander
  Advances in Radio Science (15): 249-258 (2017-10-25)
  Open Access | Publisher DOI
• A multilayer reconfigurable transmitarray in k-band for beam steering applications
  Frank, Matthias; Weigel, Robert; Kölpin, Alexander
  International Conference on Electromagnetics in Advanced Applications, ICEAA: 8065361 (2017-10-11)
  Publisher DOI
• Increasing the signal-to-noise ratio in APD-based scanning LiDAR sensors on the transmission side
  Fersch, Thomas; Weigel, Robert; Kölpin, Alexander
  IEEE Conference on Recent Advances in Lightwave Technology, CRALT: 8066038 (2017-10-11)
  Publisher DOI
• Smart communication and relative localization system for firefighters and rescuers
  Lurz, Fabian; Müller, Simon; Lindner, Stefan; Linz, Sarah; Gardill, Markus; Weigel, Robert; Kölpin, Alexander
  IEEE MTT-S International Microwave Symposium Digest: 8058885 (2017-10-04)
  Publisher DOI
• Dimensioning and comparison of common compensation topologies for IPT systems
  Trautmann, Martin; Ohlendorf, Marius; Sanftl, Benedikt; Weigel, Robert; Kölpin, Alexander
  IEEE International Symposium on Circuits and Systems: 8050511 (2017-09-25)
  Publisher DOI
• A FPGA correlation receiver for CDMA encoded LiDAR signals
  Fersch, Thomas; Alam, Md Ferdous; Weigel, Robert; Kölpin, Alexander
  Conference on PhD Research in Microelectronics and Electronics, PRIME: 7974164 (2017-07-10)
  Publisher DOI
• A Survey on Analog-to-Digital Converter Performance with Respect to Ionizing Radiation
  Mueller, Steffen; Weigel, Robert; Kölpin, Alexander
  European Conference on Radiation and Its Effects on Components and Systems, RADECS: 8696150 (2017-07-02)
  Publisher DOI
• Advanced In-Situ Instrumentation of RF Circuits for Mixed-Field Irradiation Testing Purpose
  Mueller, Steffen; Danzeca, Salvatore; Alía, Rubén Garcia; Brugger, Markus; Weigel, Robert; Kölpin, Alexander
  European Conference on Radiation and Its Effects on Components and Systems, RADECS: 8696117 (2017-07-02)
  Publisher DOI
• Advanced template matching algorithm for instantaneous heartbeat detection using continuous wave radar systems
  Will, Christoph; Shi, Kilin; Weigel, Robert; Kölpin, Alexander
  IEEE MTT-S International Microwave Bio Conference, IMBioC: 7965797 (2017-06-30)
  Publisher DOI
• Error compensation of the temperature influence on radar based displacement measurements
  Will, Christoph; Mann, Sebastian; Michler, Fabian; Reissland, Torsten; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  Asia-Pacific Microwave Conference Proceedings, APMC: 89-92 (2017-06-28)
  Publisher DOI
• In-line material characterization sensors operating at 10GHz and 77GHz
  Frank, Martin; Talai, Armin; Weigel, Robert; Kölpin, Alexander
  Asia-Pacific Microwave Conference Proceedings, APMC: 1306-1309 (2017-06-28)
  Publisher DOI
• Mixer assisted interferometric six-port system for accurate distance measurements
  Lindner, Stefan; Lurz, Fabian; Linz, Sarah; Weigel, Robert; Kölpin, Alexander
  European Microwave Week, EuMW, European Microwave Conference, EuMC 2017: 291-294 (2017-06-28)
  Publisher DOI
• Increased data rate using higher-order digital modulation for simultaneous inductive data and power transfer systems
  Sanftl, Benedikt; Trautmann, Martin; Kleinhenz, Markus; Weigel, Robert; Kölpin, Alexander
  Wireless Power Transfer Conference, WPTC: 7953843 (2017-06-19)
  Publisher DOI
• A CDMA Modulation Technique for Automotive Time-of-Flight LiDAR Systems
  Fersch, Thomas; Weigel, Robert; Kölpin, Alexander
  IEEE Sensors Journal 11 (17): 7887680 (2017-06-01)
  Publisher DOI
• Design of a 24 GHz reconfigurable transmitarray element with continuous phase range
  Frank, Martin; Weigel, Robert; Kölpin, Alexander
  European Conference on Antennas and Propagation, EUCAP: 7928298 (2017-05-15)
  Publisher DOI
• High-Speed Resonant Surface Acoustic Wave Instrumentation Based on Instantaneous Frequency Measurement
  Lurz, Fabian; Lindner, Stefan; Linz, Sarah; Mann, Sebastian; Weigel, Robert; Kölpin, Alexander
  IEEE Transactions on Instrumentation and Measurement 5 (66): 7827127 (2017-05)
  Publisher DOI
• Robust Resource Allocation for MIMO Wireless Powered Communication Networks Based on a Non-Linear EH Model
  Boshkovska, Elena; Ng, Derrick Wing Kwan; Zlatanov, Nikola; Kölpin, Alexander; Schober, Robert
  IEEE Transactions on Communications 5 (65): 7843670 (2017-05)
  Publisher DOI
• Assessment of Transmitter Initiated Wake-Up Radio Versus Pure Wake-Up Receiver Decoding
  Hierold, Martin; Weigel, Robert; Kölpin, Alexander
  IEEE Microwave and Wireless Components Letters 4 (27): 7885534 (2017-04)
  Publisher DOI
• A direct RF-to-baseband quadrature subsampling receiver using a low cost ADC
  Haberl, Matthias; Sanftl, Benedikt; Trautmann, Martin; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS: 7885970 (2017-03-23)
  Publisher DOI
• SDR implementation of an adaptive low-latency IEEE 802.11p transmitter system for real-time wireless applications
  Kloc, Matej; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS: 7885989 (2017-03-23)
  Publisher DOI
• Detector nonlinearity in Six-port radar
  Linz, Sarah; Will, Christoph; Lurz, Fabian; Lindner, Stefan; Mann, Sebastian; Schober, Robert; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 7878745 (2017-03-14)
  Publisher DOI
• RSSI-based localization with minimal infrastructure using multivariate statistic techniques
  Pflaum, Felix; Erhardt, Stefan; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 7878758 (2017-03-14)
  Publisher DOI
• Segmental polynomial approximation based phase error correction for precise near field displacement measurements using Six-Port microwave interferometers
  Will, Christoph; Linz, Sarah; Mann, Sebastian; Lurz, Fabian; Lindner, Stefan; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 7878746 (2017-03-14)
  Publisher DOI
• A robust light-weight protocol stack for data transmission within inductive power transfer systems
  Sanftl, Benedikt; Magel, Thomas; Trautmann, Martin; Weigel, Robert; Kölpin, Alexander
  APMediaCast 2016: 7878179 (2017-03-13)
  Publisher DOI
• A Coplanar Waveguide Resonator Based In-Line Material Characterization Sensor for Bulk and Metallized Dielectrics
  Talai, Armin; Gold, Gerald; Frank, Martin; Mann, Sebastian; Weigel, Robert; Kölpin, Alexander
  Frequenz 3-4 (71): 173-183 (2017-03-01)
  Publisher DOI
• Enhancing the real-time performance of a wireless hardware-in-the-loop test system in ISM bands
  Kloc, Matej; Weigel, Robert; Kölpin, Alexander
  Advances in Wireless and Optical Communications, RTUWO: 7821877 (2017-01-17)
  Publisher DOI
• A low-cost laser barrier based vectorial velocity measurement system
  Lindner, Stefan; Weigel, Robert; Kölpin, Alexander
  IEEE Sensors: 7808494 (2017-01-05)
  Publisher DOI
• Concentration and temperature dependent selectivity of the LTCC porosification process with phosphoric acid
  Steinhäußer, Frank; Talai, Armin; Göltl, Gwen; Steiger-Thirsfeld, Andreas; Bittner, Achim; Weigel, Robert; Kölpin, Alexander; Schmid, Ulrich
  Ceramics International 1 (43): 714-721 (2017-01-01)
  Publisher DOI
• Challenges in Miniaturized Automotive Long-Range Lidar System Design
  Fersch, Thomas; Weigel, Robert; Kölpin, Alexander
  SPIE Commercial + Scientific Sensing and : (2017)
  Publisher DOI
• Comparison of laser safe scanning patterns for second generation LiDAR deflection units
  Fersch, Thomas; Weigel, Robert; Kölpin, Alexander
  Proceedings International Radar Symposium (2017)
  Publisher DOI

2016

• Making real-Time hardware-in-The-loop testing of automotive electronic control units wireless
  Kloc, Matej; Weigel, Robert; Kölpin, Alexander
  International Conference on Advanced Technologies for Communications: 7764816 (2016-12-01)
  Publisher DOI
• A fast and precise Six-Port-based IFM technique for wireless resonant SAW sensing
  Weigel, Robert; Lurz, Fabian; Lindner, Stefan; Mann, Sebastian; Linz, Sarah; Kölpin, Alexander
  IEEE International Ultrasonics Symposium, IUS: 7728613 (2016-11-01)
  Publisher DOI
• Test Method for Contactless On-Wafer MEMS Characterization and Production Monitoring
  Linz, Sarah; Oesterle, Florian; Lindner, Stefan; Mann, Sebastian; Weigel, Robert; Kölpin, Alexander
  IEEE Transactions on Microwave Theory and Techniques 11 (64): 7587394 (2016-11)
  Publisher DOI
• Six-port based interferometry for precise radar and sensing applications
  Kölpin, Alexander; Lurz, Fabian; Linz, Sarah; Mann, Sebastian; Will, Christoph; Lindner, Stefan
  Sensors (Switzerland) 10 (16): 1556 (2016-09-01)
  Open Access | Publisher DOI
• A planar reconfigurable focal plane array antenna for 24 GHz
  Sporer, Michael; Weigel, Robert; Kölpin, Alexander
  IEEE MTT-S International Microwave Symposium Digest (2016-August): 7540286 (2016-08-09)
  Publisher DOI
• Robust beamforming for SWIPT systems with non-linear energy harvesting model
  Boshkovska, Elena; Kölpin, Alexander; Ng, Derrick Wing Kwan; Zlatanov, Nikola; Schober, Robert
  IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC: 7536860 (2016-08-09)
  Publisher DOI
• Reliabe data link for power transfer control in an inductive charging system for electric vehicles
  Sanftl, Benedikt; Joffe, Christopher; Trautmann, Martin; Weigel, Robert; Kölpin, Alexander
  IEEE MTT-S International Conference on Microwaves for Intelligent Mobility, ICMIM: 7533929 (2016-08-04)
  Publisher DOI
• Precise and fast frequency determination of resonant SAW sensors by a low-cost Six-Port interferometer
  Lurz, Fabian; Lindner, Stefan; Mann, Sebastian; Linz, Sarah; Weigel, Robert; Kölpin, Alexander
  IEEE Instrumentation and Measurement Technology Conference: 7520390 (2016-07-22)
  Publisher DOI
• A novel approach for reliable communications within inductive power transfer systems
  Sanftl, Benedikt; Pflaum, Felix; Trautmann, Martin; Weigel, Robert; Kölpin, Alexander
  IEEE Wireless Power Transfer Conference, WPTC: 7498830 (2016-06-23)
  Publisher DOI
• A cost-efficient 61 GHz high-resolution radar sensor for industrial positioning and distance measurement
  Wibbing, Sascha; Mann, Sebastian; Lurz, Fabian; Erhardt, Stefan; Lindner, Stefan; Weigel, Robert; Kölpin, Alexander
  International Conference on Microwave, Radar and Wireless Communications, MIKON: 7491940 (2016-06-14)
  Publisher DOI
• Permittivity reduction and surface modification by porosification of LTCC
  Steinhäußer, Frank; Talai, Armin; Weigel, Robert; Kölpin, Alexander; Bittner, Achim; Schmid, Ulrich
  Ceramics International 7 (42): 8925-8931 (2016-05-15)
  Publisher DOI
• Pulse plated silver metallization on porosified LTCC substrates for high frequency applications
  Steinhäußer, Frank; Talai, Armin; Sandulache, Gabriela; Weigel, Robert; Kölpin, Alexander; Hansal, Wolfgang; Bittner, Achim; Schmid, Ulrich
  Microelectronics Reliability (60): 93-100 (2016-05-01)
  Publisher DOI
• A grounded coplanar waveguide resonator based in-line material characterization sensor
  Talai, Armin; Mann, Sebastian; Weigel, Robert; Kölpin, Alexander
  German Microwave Conference, GeMiC: 7461654 (2016-04-27)
  Publisher DOI
• Determining linearity of wideband FMCW-systems based on low-cost Six-Port technology
  Wibbing, Sascha; Lurz, Fabian; Mann, Sebastian; Lindner, Stefan; Linz, Sarah; Weigel, Robert; Kölpin, Alexander
  German Microwave Conference, GeMiC: 7461637 (2016-04-27)
  Publisher DOI
• Differential measuring dual six-port concept and antenna design for an inline foil thickness sensor
  Mann, Sebastian; Linz, Sarah; Erhardt, Stefan; Lindner, Stefan; Lurz, Fabian; Maune, Holger; Weigel, Robert; Kölpin, Alexander
  German Microwave Conference, GeMiC: 7461581 (2016-04-27)
  Publisher DOI
• The influence of rain on small aperture LiDAR sensors
  Fersch, Thomas; Buhmann, Alexander; Kölpin, Alexander; Weigel, Robert
  German Microwave Conference, GeMiC: 7461562 (2016-04-27)
  Publisher DOI
• Digital phase correction for multiplexed ADCs in low-cost Six-Port interferometers
  Lurz, Fabian; Dorn, Christian; Lindner, Stefan; Linz, Sarah; Mann, Sebastian; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 7444321 (2016-03-30)
  Publisher DOI
• Implementation of simultaneous energy and data transfer in a contactless connector
  Trautmann, Martin; Joffe, Christopher; Pflaum, Felix; Sanftl, Benedikt; Weigel, Robert; Heckel, Thomas; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 7444333 (2016-03-30)
  Publisher DOI
• Improved calibration procedure for six-port based precise displacement measurements
  Staszek, Kamil; Linz, Sarah; Lurz, Fabian; Mann, Sebastian; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 7444322 (2016-03-30)
  Publisher DOI
• Instantaneous heartbeat detection using a cross-correlation based template matching for continuous wave radar systems
  Will, Christoph; Shi, Kilin; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks: 7444314 (2016-03-30)
  Publisher DOI
• Low-weight wireless sensor node for animal encounter detection and dual-band localization
  Hierold, Martin; Hartmann, Markus; Ripperger, Simon; Mayer, Frieder; Heuberger, Albert; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet : 7444311 (2016-03-30)
  Publisher DOI
• Progress of Six-Port technology for industrial radar applications
  Vinci, Gabor; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks: 7444319 (2016-03-30)
  Publisher DOI
• Substrate integrated waveguide fed antenna for 61 GHz ultra-short-range interferometric radar systems
  Mann, Sebastian; Lurz, Fabian; Linz, Sarah; Lindner, Stefan; Will, Christoph; Wibbing, Sascha; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 7444323 (2016-03-30)
  Publisher DOI
• Intelligent signal processing routine for instantaneous heart rate detection using a Six-Port microwave interferometer
  Will, Christoph; Shi, Kilin; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS: 7432820 (2016-03-11)
  Publisher DOI
• Automated proximity sensing in small vertebrates: design of miniaturized sensor nodes and first field tests in bats
  Ripperger, Simon; Josic, Darija; Hierold, Martin; Kölpin, Alexander; Weigel, Robert; Hartmann, Markus; Page, Rachel A.; Mayer, Frieder
  Ecology and Evolution 7 (6): 2179-2189 (2016-04-01)
  Open Access | Publisher DOI
• Embedded cavity based dielectric loss measurements for LTCC substrates up to 110 GHz
  Talai, Armin; Steinhäußer, Frank; Bittner, Achim; Schmid, Ulrich; Weigel, Robert; Schwanke, Dieter; Rittweg, Thomas; Kölpin, Alexander
  IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization, NEMO: 7415066 (2016-02-19)
  Publisher DOI
• From radio telemetry to ultra-low-power sensor networks: Tracking bats in the wild
  Dressler, Falko; Ripperger, Simon; Hierold, Martin; Nowak, Thorsten; Eibel, Christopher; Cassens, Björn; Mayer, Frieder; Meyer-Wegener, Klaus; Kölpin, Alexander
  IEEE Communications Magazine 1 (54): 7378438 (2016-01-01)
  Publisher DOI
• Frequency separation stage design for a reliable data link in an IPT system for electric vehicles
  Trautmann, Martin; Sanftl, Benedikt; Weigel, Robert; Kölpin, Alexander
  IEEE 2nd Annual Southern Power Electronics Conference, SPEC 2016: 7846000 (2016-12)
  Publisher DOI

2015

• Protocol design for ultra-low power wake-up systems for tracking bats in the wild
  Dressler, Falko; Bloessl, Bastian; Hierold, Martin; Hsieh, Chia Yu; Nowak, Thorsten; Weigel, Robert; Kölpin, Alexander
  IEEE International Conference on Communications: 7249335 6345-6350 (2015-09-09)
  Publisher DOI
• A method for the determination of the complex permittivity by detuned ring resonators for bulk materials up to 110 GHz
  Talai, Armin; Steinhäußer, Frank; Bittner, Achim; Schmid, Ulrich; Weigel, Robert; Kölpin, Alexander
  International Journal of Microwave and Wireless Technologies 3-4 (7): 251-260 (2015-06-25)
  Publisher DOI
• Distance measurements and limitations based on guided wave 24 GHz dual tone Six-port radar
  Lindner, Stefan; Barbon, Francesco; Linz, Sarah; Mann, Sebastian; Weigel, Robert; Kölpin, Alexander
  International Journal of Microwave and Wireless Technologies 3-4 (7): 425-432 (2015-06-25)
  Publisher DOI
• A semi double-ridged quasi TE-waveguide based microwave bulk material characterization system
  Talai, Armin; Mann, Sebastian; Steinhäußer, Frank; Schmid, Ulrich; Weigel, Robert; Bittner, Achim; Kölpin, Alexander
  IEEE MTT-S International Microwave Symposium, IMS: 7166937 (2015-05)
  Publisher DOI
• Ultra-short-range, precise displacement measurement setup with a near field slot-line antenna and a dedicated spiral calibration
  Linz, Sarah; Lurz, Fabian; Sporer, Michael; Lindner, Stefan; Mann, Sebastian; Weigel, Robert; Kölpin, Alexander
  IEEE MTT-S International Microwave Symposium, IMS: 7167116 (2015-05)
  Publisher DOI
• In-containment signal conditioning and transmission via power lines within high dose rate areas of nuclear power plants
  Mueller, Steffen; Dennerlein, Juergen; Janke, Iryna; Weber, Johannes; Weigel, Robert; Kölpin, Alexander
  International Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications, ANIMMA: 7465532 (2015-04)
  Publisher DOI
• Microwave interferometer radar-based vital sign detection for driver monitoring systems
  Vinci, Gabor; Lenhard, Thilo; Will, Christoph; Kölpin, Alexander
  IEEE MTT-S International Conference on Microwaves for Intelligent Mobility, ICMIM: 7117940 (2015-04)
  Publisher DOI
• A high-sensitivity radar system featuring low weight and power consumption
  Mann, Sebastian; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE Microwave Magazine 2 (16): 07032054 (2015-03-01)
  Publisher DOI
• 100 GHz reflectometer for sensitivity analysis of MEMS sensors comprising an intermediate frequency Six-port receiver
  Linz, Sarah; Oesterle, Florian; Talai, Armin; Lindner, Stefan; Mann, Sebastian; Barbon, Francesco; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 7127403 (2015-01)
  Publisher DOI
• A low power 24 GHz radar system for occupancy monitoring
  Lurz, Fabian; Mann, Sebastian; Linz, Sarah; Lindner, Stefan; Barbon, Francesco; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS: 7129719 (2015-01)
  Publisher DOI
• ADC depending limitations for Six-Port based distance measurement systems
  Lindner, Stefan; Barbon, Francesco; Linz, Sarah; Lurz, Fabian; Mann, Sebastian; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 7127396 (2015-01)
  Publisher DOI
• Combined localization and data transmission in energy-constrained wireless sensor networks
  Nowak, Thorsten; Kölpin, Alexander; Dressler, Falko; Hartmann, Markus; Patino, Lucila; Thielecke, Jörn
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 7127395 (2015-01)
  Publisher DOI
• Diode detector design for 61 GHz substrate integrated waveguide Six-Port radar systems
  Mann, Sebastian; Erhardt, Stefan; Lindner, Stefan; Lurz, Fabian; Linz, Sarah; Barbon, Francesco; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 7127415 (2015-01)
  Publisher DOI
• Low-weight wireless sensor network for encounter detection of bats
  Hierold, Martin; Ripperger, Simon; Josic, Darija; Mayer, Frieder; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 7127416 (2015-01)
  Publisher DOI
• Underwater interferometric radar sensor for distance and vibration measurement
  Sporer, Michael; Lurz, Fabian; Schluecker, Eberhard; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 7127405 (2015-01)
  Publisher DOI
• System design for encounter detection of distributed wireless sensors
  Hierold, Martin; Ripperger, Simon; Mayer, Frieder; Weigel, Robert; Kölpin, Alexander
  German Microwave Conference, GeMiC: 7107833 (2015)
  Publisher DOI

2014

• A simplified equivalent model for microwave characteristics of porosified LTCC
  Talai, Armin; Steinhäußer, Frank; Bittner, Achim; Schmid, Ulrich; Weigel, Robert; Kölpin, Alexander
  URSI General Assembly and Scientific Symposium, URSI GASS: 6929397 (2014-10-17)
  Publisher DOI
• Distance measurements based on Guided Wave 24GHz dual tone six-port radar
  Lindner, Stefan; Barbon, Francesco; Linz, Sarah; Mann, Sebastian; Weigel, Robert; Kölpin, Alexander
  European Microwave Week 2014: Connecting the Future, EuMW 2014 , EuMC 2014: 6991206 57-60 (2014-10)
  Publisher DOI
• Graphical based characterisation and modelling of material gradients in porosified LTCC
  Steinhäußer, Frank; Talai, Armin; Steiger-Thirsfeld, Andreas; Kölpin, Alexander; Weigel, Robert; Bittner, Achim; Schmid, Ulrich
  Journal of the European Ceramic Society 11 (34): 2833-2838 (2014-09)
  Publisher DOI
• Electromagnetic analysis of conductor track surface roughnesses from 1 GHz to 110 GHz
  Talai, Armin; Steinhäußer, Frank; Gmeiner, Björn; Wegener, Moritz; Bittner, Achim; Deisinger, Ulrike; Schmid, Ulrich; Roosen, Andreas; Weigel, Robert; Kölpin, Alexander
  International Conference on Electromagnetics in Advanced Applications, ICEAA: 6903887 (2014-08)
  Publisher DOI
• Estimation error analysis and compensation of dual Six-Port based DOA detection
  Vinci, Gabor; Linz, Sarah; Kölpin, Alexander
  IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, APWC: 6905543 (2014-08)
  Publisher DOI
• Evaluation of the impact of antenna parameters on the performance of Six-port radar
  Linz, Sarah; Vinci, Gabor; Lindner, Stefan; Mann, Sebastian; Lurz, Fabian; Barbon, Francesco; Weigel, Robert; Kölpin, Alexander
  IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, APWC: 6905552 (2014-08)
  Publisher DOI
• Multiport technology: new perspectives and applications
  Tatu, Serioja Ovidiu; Serban, Adriana; Kölpin, Alexander; Helaoui, Mohamed
  Journal of Electrical and Computer Engineering (2014): 194649, 1-4 (2014)
  Open Access | Publisher DOI
• 61 GHz millimeter wave voltage variable attenuator based on flip-chip mounted PIN-diodes
  Mann, Sebastian; Lurz, Fabian; Lindner, Stefan; Barbon, Francesco; Linz, Sarah; Weigel, Robert; Kölpin, Alexander
  International Conference on Microwaves, Radar and Wireless Communications, MIKON: 6899966 (2014-06)
  Publisher DOI
• A microwave interferometer based contactless quasi-TEM waveguide position encoder with micrometer accuracy
  Mann, Sebastian; Lindner, Stefan; Lurz, Fabian; Barbon, Francesco; Linz, Sarah; Weigel, Robert; Kölpin, Alexander
  IEEE MTT-S International Microwave Symposium Digest: 6848655 (2014-06)
  Publisher DOI
• Selftest strategies for microwave interferometry for high-precision industrial distance measurements
  Kölpin, Alexander; Linz, Sarah; Barbon, Francesco; Lindner, Stefan; Mann, Sebastian; Lurz, Fabian; Weigel, Robert
  International Conference on Microwaves, Radar and Wireless Communications, MIKON: 6899991 (2014-06)
  Publisher DOI
• Six-Port based direction finding and ranging
  Kölpin, Alexander; Weigel, Robert
  International Conference on Microwaves, Radar and Wireless Communications, MIKON: 6899826 (2014-06)
  Publisher DOI
• Numerical investigations on the quasi-stationary response of antennas to wideband LFMCW excitation
  Gardill, Markus; Kay, Dennis; Weigel, Robert; Kölpin, Alexander
  European Signal Processing Conference: 6952333 (2014-05)
  
• The influence by trapezoidal conductor shapes on ring-resonator based material characterization up to 110 GHz
  Talai, Armin; Weigel, Robert; Kölpin, Alexander; Steinhäußer, Frank; Bittner, Achim; Schmid, Ulrich
  International Conference on Numerical Electromagnetic Modeling and Optimization for RF, Microwave, and Terahertz Applications, NEMO: 6995723 (2014-05)
  Publisher DOI
• A tank level sensor based on Six-Port technique comprising a quasi-TEM waveguide
  Mann, Sebastian; Lindner, Stefan; Barbon, Francesco; Linz, Sarah; Talai, Armin; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 6825512 (2014-01)
  Publisher DOI
• Fast in-situ diode detector characterization for Six-Port interferometer receivers
  Barbon, Francesco; Lindner, Stefan; Mann, Sebastian; Linz, Sarah; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet: 6825501 (2014-01)
  Publisher DOI
• A low-cost 2.4GHz frequency measurement system for microsecond time domain pulses based on Six-Port technology
  Lurz, Fabian; Lindner, Stefan; Mann, Sebastian; Linz, Sarah; Barbon, Francesco; Weigel, Robert; Kölpin, Alexander
  European Microwave Conference: 6986397 (2014)
  Publisher DOI
• A permittivity characterization method by detuned ring-resonators for bulk materials up to 110 GHz
  Talai, Armin; Steinhäußer, Frank; Bittner, Achim; Schmid, Ulrich; Weigel, Robert; Kölpin, Alexander
  European Microwave Conference: 6986385 (2014)
  Publisher DOI
• Extended range distance measurements based on frequency and power compensated Six-Port receiver
  Barbon, Francesco; Lindner, Stefan; Mann, Sebastian; Linz, Sarah; Weigel, Robert; Kölpin, Alexander
  European Microwave Conference: 6986541 (2014)
  Publisher DOI
• I/Q imbalance compensation for Six-port interferometers in radar applications
  Linz, Sarah; Vinci, Gabor; Lindner, Stefan; Mann, Sebastian; Lurz, Fabian; Barbon, Francesco; Weigel, Robert; Kölpin, Alexander
  European Microwave Conference: 6986542 (2014)
  Publisher DOI
• Multiport technology
  Tatu, Serioja Ovidiu; Serban, Adriana; Helaoui, Mohamed; Kölpin, Alexander
  IEEE Microwave Magazine 7 (15): 6954653 (2014)
  Publisher DOI
• Open-ended dielectric-filled waveguide antenna for underwater usage
  Sporer, Michael; Weigel, Robert; Kölpin, Alexander
  European Microwave Conference: 6986779 (2014)
  Publisher DOI
• System and signal design for an energy-efficient multi-frequency localization system
  Nowak, Thorsten; Hierold, Martin; Kölpin, Alexander; Hartmann, Markus; Troger, Hans-Martin; Thielecke, Jorn
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet (2014)
  Publisher DOI
• Ultra-wideband small modular array antenna based on column-coupled Vivaldi subarrays
  Gardill, Markus; Weigel, Robert; Kölpin, Alexander
  European Conference on Antennas and Propagation, EuCAP: 6902616 (2014)
  Publisher DOI
• Water temperature measurement by microwave six-port interferometry at 24 GHz
  Talai, Armin; Mann, Sebastian; Weigel, Robert; Kölpin, Alexander
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, WiSNet (2014): 6825498 10-12 (2014)
  Publisher DOI

2013

• WiSNet2014
  Kölpin, Alexander; Khanna, Rahul
  IEEE Microwave Magazine 7 (14): 6668896 (2013-12-23)
  Publisher DOI
• A compact, versatile six-port radar module for industrial and medical applications
  Linz, Sarah; Vinci, Gabor; Mann, Sebastian; Lindner, Stefan; Barbon, Francesco; Weigel, Robert; Kölpin, Alexander
  Journal of Electrical and Computer Engineering (2013): 382913, 1-10 (2013)
  Open Access | Publisher DOI
• Electromagnetic analysis of fringed microstrip lines on porosified LTCC
  Talai, Armin; Steinhauser, Frank; Gmeiner, Björn; Bittner, Achim; Rude, Ulrich; Schmid, Ulrich; Weigel, Robert; Kölpin, Alexander
  International Conference on Electromagnetics in Advanced Applications, ICEAA: 6632433 (2013-12-02)
  Publisher DOI
• A finite 3D field simulation method for permittivity gradient implementation of a novel porosification process in LTCC
  Talai, Armin; Steinhäußer, Frank; Schmid, Ulrich; Weigel, Robert; Bittner, Achim; Kölpin, Alexander
  IEEE MTT-S International Microwave Symposium Digest: 6697583 (2013-12-01)
  Publisher DOI
• A novel, W-band microwave based contactless test method for mechanical sensitivity analysis of MEMS
  Oesterle, Florian; Vinci, Gabor; Weigel, Robert; Kölpin, Alexander
  IEEE MTT-S International Microwave Symposium Digest: 6697701 (2013-12-01)
  Publisher DOI
• A new approach on MEMS sensor batch testing using an analogue parallel test methodology for massive reduction of test time
  Oesterle, Florian; Weigel, Robert; Kölpin, Alexander
  IEEE Sensors: 6688626 (2013-11)
  Publisher DOI
• Dual Six-Port based direction-of-arrival detector for FMCW radar tracking in the ISM band at 24GHz
  Vinci, Gabor; Lindner, Stefan; Mann, Sebastian; Barbon, Francesco; Weigel, Robert; Kölpin, Alexander
  IEEE Sensors: 6688520 (2013-11)
  Publisher DOI
• A high performance line filter for narrowband power line communication testbed applications
  Mueller, Steffen; Lurz, Fabian; Weigel, Robert; Kölpin, Alexander
  IEEE International Conference on Smart Grid Communications, SmartGridComm: 6688039 (2013-10)
  Publisher DOI
• Electromagnetic field analysis with advanced structural modeling of microstrips on porosified LTCC
  Talai, Armin; Weigel, Robert; Kölpin, Alexander; Gmeiner, Björn; Rude, Ulrich; Steinhäußer, Frank; Bittner, Achim; Schmid, Ulrich
  European Microwave Week (EuMC 2013)
  
• Evaluation of a microwave based contact-free testing method for mechanical sensitivity analysis of MEMS for inline integration of on-wafer measurements
  Oesterle, Florian; Gardill, Markus; Weigel, Robert; Kölpin, Alexander
  European Microwave Conference (EuMC 2013)
  
• Six-Port microwave interferometer radar for mechanical vibration analysis
  Vinci, Gabor; Lindner, Stefan; Mann, Sebastian; Barbon, Francesco; Linz, Sarah; Weigel, Robert; Kölpin, Alexander
  European Microwave Week, EuMW; EuRAD: 10th European Radar Conference: 6689170 (2013-10)
  
• Six-Port technology for precise geometrical measurement applications - An overview
  Kölpin, Alexander; Vinci, Gabor; Lindner, Stefan; Mann, Sebastian; Barbon, Francesco; Linz, Sarah; Oesterle, Florian; Weigel, Robert
  43th European Microwave Conference (EuMC 2013)
  
• Single-element based ultra-wideband antenna array concepts for wireless high-precision 2-D local positioning
  Gardill, Markus; Fischer, Georg; Weigel, Robert; Kölpin, Alexander
  Advances in Radio Science (11): 297-305 (2013-09-03)
  Open Access | Publisher DOI
• 61 GHz Six-Port radar frontend for high accuracy range detection applications
  Mann, Sebastian; Vinci, Gabor; Lindner, Stefan; Linz, Sarah; Barbon, Francesco; Weigel, Robert; Kölpin, Alexander
  IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, IEEE APWC: 6624910 (2013-09)
  Publisher DOI
• Design of an ultra-wideband monocone circular antenna array for vehicle-integrated industrial local positioning applications
  Gardill, Markus; Fischer, Georg; Weigel, Robert; Kölpin, Alexander
  European Conference on Antennas and Propagation, EuCAP: 6546684 (2013-08-14)
  
• A Large deflection model of silicon membranes for testing intrinsic stress of MEMS microphones by measuring pull-in voltage
  Oesterle, Florian; Fink, Franz; Kuhn, Harald; Dehe, Alfons; Weigel, Robert; Kölpin, Alexander
  The International Society for Optical Engineering (8763): 876326 (2013-08-12)
  Publisher DOI
• Dual tone approach for unambiguous six-port based interferometric distance measurements
  Lindner, Stefan; Barbon, Francesco; Mann, Sebastian; Vinci, Gabor; Weigel, Robert; Kölpin, Alexander
  IEEE MTT-S International Microwave: 6697581 (2013-06)
  Publisher DOI
• Six-port radar sensor for remote respiration rate and heartbeat vital-sign monitoring
  Vinci, Gabor; Lindner, Stefan; Barbon, Francesco; Mann, Sebastian; Hofmann, Maximilian; Duda, Alexander; Weigel, Robert; Kölpin, Alexander
  IEEE Transactions on Microwave Theory and Techniques 5 (61): 6473856 (2013-03-11)
  Publisher DOI
• A fully integrated 120-GHz six-port receiver front-end in a 130-nm SiGe BiCMOS technology
  Laemmle, Benjamin; Schmalz, Klaus; Borngraeber, Johannes; Scheytt, Christoph; Weigel, Robert; Kölpin, Alexander; Kissinger, Dietmar
  IEEE 13th Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems, SiRF, RWW: 6489455 (2013-01)
  Publisher DOI
• Design of a robust and low-cost monocone antenna element for use in vehicle roof-mounted antenna arrays
  Gardill, Markus; Fischer, Georg; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS: 6486658 (2013-01)
  Publisher DOI
• Ultra-wideband small antenna subarray module with narrow elevation pattern
  Gardill, Markus; Schneider, Jurij; Oesterle, Florian; Fischer, Georg; Weigel, Robert; Kölpin, Alexander
  IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, IEEE APWC: 6624934 (2013)
  Publisher DOI

2012

• Promise of a better position
  Vinci, Gabor; Lindner, Stefan; Barbon, Francesco; Weigel, Robert; Kölpin, Alexander
  IEEE Microwave Magazine 7 (13): 6355801 (2012-12-04)
  Publisher DOI
• 24 GHz six-port medical radar for contactless respiration detection and heartbeat monitoring
  Vinci, Gabor; Lindner, Stefan; Barbon, Francesco; Hofmann, Sebastian; Fischer, Georg; Kissinger, Dietmar; Kölpin, Alexander
  European Microwave Week, EuMW, European Radar Conference, EuRAD: 6450726 (2012-11)
  
• An area-efficient 130 nm CMOS baseband processing unit for 24 GHz FMCW radar positioning
  Ferizi, Alban; Baust, Philipp; Jung, Melanie; Fischer, Georg; Weigel, Robert; Kölpin, Alexander
  International Symposium on Signals, Systems and Electronics: 6374292 (2012-10)
  Publisher DOI
• Filter design aspects in analog receiver front-ends for frequency scanning applications
  Dehm-Andone, Gunther; Mzyk, Raphael; Hausknecht, Frank; Fischer, Georg; Weigel, Robert; Kölpin, Alexander
  International Symposium on Signals, Systems and Electronics: 6374312 (2012-10)
  Publisher DOI
• Initial calibration procedure of a six-port receiver system for complex data reception
  Lindner, Stefan; Barbon, Francesco; Vinci, Gabor; Weigel, Robert; Kölpin, Alexander
  European Microwave Week, EuMW, European Radar Conference, EuRAD: 6450730 (2012-10)
  
• A wideband unidirectional antenna array element with stable radiation pattern
  Gardill, Markus; Weigel, Robert; Kölpin, Alexander
  IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, APWC: 6324927 (2012-09)
  Publisher DOI
• Six-port based high-resolution smart antenna alignment sensor
  Vinci, Gabor; Barbon, Francesco; Lindner, Stefan; Weigel, Robert; Kölpin, Alexander
  IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, APWC: 6324912 (2012-09)
  Publisher DOI
• A 77-GHz SiGe integrated six-port receiver front-end for angle-of-arrival detection
  Laemmle, Benjamin; Vinci, Gabor; Maurer, Linus; Weigel, Robert; Kölpin, Alexander
  IEEE Journal of Solid-State Circuits 9 (47): 6236224 (2012-07-17)
  Publisher DOI
• A six-port interferometer based micrometer-accuracy displacement and vibration measurement radar
  Barbon, Francesco; Vinci, Gabor; Lindner, Stefan; Weigel, Robert; Kölpin, Alexander
  IEEE MTT-S International Microwave Symposium Digest: 6259624 (2012-06)
  Publisher DOI
• A smart jamming system for UMTS/WCDMA cellular phone networks for search and rescue applications
  Zorn, Stefan; Gardill, Markus; Rose, Richard; Goetz, Alexander; Weigel, Robert; Kölpin, Alexander
  IEEE MTT-S International Microwave Symposium Digest: 6257769 (2012-06)
  Publisher DOI
• A wide-range 77 GHz Direction of Arrival detector with integrated dual six-port receiver
  Vinci, Gabor; Barbon, Francesco; Laemmle, Benjamin; Weigel, Robert; Kölpin, Alexander
  IEEE MTT-S International Microwave Symposium Digest: 6259622 (2012-06)
  Publisher DOI
• Antenna evaluation for wireless data transmission in magnetic resonance imaging
  Wiehl, Michael; Ferlin, Simone; Weigel, Robert; Kölpin, Alexander
  International Symposium on Antenna Technology and Applied Electromagnetics, ANTEM: 6262286 (2012-06)
  Publisher DOI
• The enhanced six-port architecture: A measurement based proof of concept
  Kölpin, Alexander; Lindner, Stefan; Vinci, Gabor; Laemmle, Benjamin; Weigel, Robert
  IEEE Topical Conference on Wireless Sensors and Sensor Networks, RWW, WiSNet: 6172143 29-32 (2012-05-07)
  Publisher DOI
• A practical beamsteering algorithm with low phase fluctuation for WCDMA/HSUPA uplink using transmit power control bits as feedback
  Schroeter, Simon; Weigel, Robert; Fischer, Georg; Kölpin, Alexander
  International Conference on Microwaves, Radar and Wireless Communications, MIKON (2): 6233563 (2012-05)
  Publisher DOI
• Analysis of key modules in an analog front-end for scanning receiver systems
  Mzyk, Raphael; Dehm-Andone, Gunther; Hausknecht, Frank; Fischer, Georg; Weigel, Robert; Kölpin, Alexander
  International Conference on Microwaves, Radar and Wireless Communications, MIKON (1): 6233481 (2012-05)
  Publisher DOI
• Channel impulse response inside a magnetic resonance imaging device at 0.8 GHz to 27 GHz
  Wiehl, Michael; Schwarzer, Stefan; Fischer, Georg; Weigel, Robert; Kölpin, Alexander
  International Conference on Microwaves, Radar and Wireless Communications, MIKON (1): 6233474 (2012-05)
  Publisher DOI
• High-Q split ring resonators for tuning and Balun applications
  Lautenbacher, Thomas; Mzyk, Raphael; Weigel, Robert; Fischer, Georg; Kölpin, Alexander
  International Conference on Microwaves, Radar and Wireless Communications, MIKON (1): 6233484 (2012-05)
  Publisher DOI
• Six-port technology for traffic safety
  Kölpin, Alexander; Vinci, Gabor; Laemmle, Benjamin; Lindner, Stefan; Barbon, Francesco; Weigel, Robert
  IEEE Microwave Magazine 3 (13): 6179893 (2012-05)
  Publisher DOI
• Design and implementation of a fixed-point radix-4 FFT optimized for local positioning in wireless sensor networks
  Ferizi, Alban; Hoeher, Bernhard; Jung, Melanie; Fischer, Georg; Kölpin, Alexander
  International Multi-Conference on Systems, Signals and Devices, SSD: 6197958 (2012-03)
  Publisher DOI
• Design aspects of scanning receiver systems
  Mzyk, Raphael; Dehm-Andone, Gunther; Hausknecht, Frank; Fischer, Georg; Weigel, Robert; Kölpin, Alexander
  German Microwave Conference, GeMiC: 6185164 (2012-03)
  
• Signal processing strategies for six-port based direction of arrival detector systems
  Barbon, Francesco; Vinci, Gabor; Lindner, Stefan; Weigel, Robert; Kölpin, Alexander
  International Multi-Conference on Systems, Signals and Devices, SSD: 6197973 (2012-03)
  Publisher DOI
• The six-port technology: A low-cost concept for precise position measurements
  Kölpin, Alexander; Vinci, Gabor; Barbon, Francesco; Lindner, Stefan; Fischer, Georg; Weigel, Robert
  International Multi-Conference on Systems, Signals and Devices, SSD 2012: 6198100 (2012-03)
  Publisher DOI
• Wide-range, dual six-port based Direction-Of-Arrival detector
  Vinci, Gabor; Barbon, Francesco; Laemmle, Benjamin; Weigel, Robert; Kölpin, Alexander
  German Microwave Conference, GeMiC: 6185176 (2012-03)
  
• A 77 GHz direction of arrival detector system with SiGe integrated six-port receiver
  Vinci, Gabor; Laemmle, Benjamin; Barbon, Francesco; Weigel, Robert; Kölpin, Alexander
  IEEE Radio and Wireless Symposium, RWS, RWW: 6175346 (2012-01)
  Publisher DOI

2011

• An integrated 77-GHz six-port receiver front-end for angle-of-arrival detection
  Laemmle, Benjamin; Vinci, Gabor; Maurer, Linus; Weigel, Robert; Kölpin, Alexander
  IEEE Bipolar/BiCMOS Circuits and Technology Meeting: 6082786 (2011-12-19)
  Publisher DOI
• A novel, wide angle, high resolution direction-of-arrival detector
  Vinci, Gabor; Barbon, Francesco; Weigel, Robert; Kölpin, Alexander
  European Microwave Week, EuMW, European Radar Conference, EuRAD: 6101014 (2011-10)
  
• A power sensor unit for the localization of GSM mobile phones for search and rescue applications
  Zorn, Stefan; Bozsik, Gabor; Rose, Richard; Goetz, Alexander; Weigel, Robert; Kölpin, Alexander
  IEEE Sensors: 6127162 (2011-10)
  Publisher DOI
• Demonstrator of a scanning receiver subsystem for cognitive professional wireless microphone systems
  Schroeter, Simon; Zimmermann, Lars; Schwender, Oliver; Fischer, Georg; Kölpin, Alexander
  Technical Symposium at ITU Telecom World, ITU WT 11: 6100954 (2011-10)
  
• The enhanced six-port receiver: A new concept for simultaneous data reception and direction of arrival detection
  Kölpin, Alexander; Vinci, Gabor; Laemmle, Benjamin; Weigel, Robert
  IEEE MTT-S International Microwave Symposium: 5972688 (2011-06)
  Publisher DOI
• An ultrawideband antenna for FMCW-radar positioning systems
  Vinci, Gabor; Waldmann, Benjamin; Weigel, Robert; Kölpin, Alexander
  European Conference on Antennas and Propagation, EUCAP: 5782379 (2011-04)
  
• A high accuracy direction-of-arrival and misalignment angle detector
  Vinci, Gabor; Barbon, Francesco; Weigel, Robert; Kölpin, Alexander
  German Microwave Conference, GeMiC: 5760697 (2011-03)
  
• Triggering UMTS user equipment inter-RAT cell reselection using noise jammers
  Gardill, Markus; Zorn, Stefan; Weigel, Robert; Kölpin, Alexander
  German Microwave Conference, GeMiC: 5760696 (2011-03)
  
• Voltage controlled oscillator with frequency tripler in MHMIC technology for V-Band applications
  Hofmann, Maximilian; Winkler, Simone; Wu, Ke; Weigel, Robert; Kölpin, Alexander
  German Microwave Conference, GeMiC: 5760789 (2011)
  

2010

• Directional couplers from 30 to 140GHz in silicon
  Laemmle, Benjamin; Schmalz, Klaus; Scheytt, Christoph; Kölpin, Alexander; Weigel, Robert
  Asia-Pacific Microwave Conference, APMC: 5728463 (2010-12)
  
• Six-Port-based Direction-Of-Arrival detection system
  Vinci, Gabor; Kölpin, Alexander; Barbon, Francesco; Weigel, Robert
  Asia-Pacific Microwave Conference Proceedings, APMC: 5728280 (2010-12)
  
• The six-port in modern society
  Kölpin, Alexander; Vinci, Gabor; Laemmle, Benjamin; Kissinger, Dietmar; Weigel, Robert
  IEEE Microwave Magazine 7 SUPPL. (11): 5590352 (2010-12)
  Publisher DOI

2009

• Employing six-port technology for phase-measurement-based calibration of automotive radar
  Vinci, Gabor; Kölpin, Alexander; Weigel, Robert
  Asia Pacific Microwave Conference, APMC: 5385312 (2009-12)
  Publisher DOI
• Introducing new design guidelines for dualband CRLH structures formed by transmission lines and lumped components
  Kölpin, Alexander; Pape, Benedikt; Weigel, Robert
  IEEE MTT-S International Microwave Workshop Series on Wireless Sensing, Local Positioning and RFID, IMWS: 5307868 (2009-09)
  Publisher DOI

2008

• Six-Port Receiver Analog Front-End: Multilayer Design and System Simulation
  Winter, Sebastian M.; Kölpin, Alexander; Weigel, Robert
  IEEE Transactions on Circuits and Systems II: Express Briefs 3 (55): 254-258 (2008-03-08)
  Publisher DOI
• Six-port receiver local oscillator power selection for maximum output SNR
  Winter, Sebastian M.; Ehm, Henning J.; Kölpin, Alexander; Weigel, Robert
  IEEE Radio and Wireless Symposium, RWS: 4463451 151-154 (2008-01)
  Publisher DOI

2007

• Diode power detector DC operating point in six-port communications receivers
  Winter, Sebastian M.; Ehm, Henning J.; Kölpin, Alexander; Weigel, Robert
  European Microwave Conference (EUMC 2007)
  Publisher DOI
• Analysis of system parameters of a six-port communications receiver with analog I/Q regeneration
  Winter, Sebastian M.; Ehm, Henning J.; Kölpin, Alexander; Weigel, Robert
  Conference Proceedings of the International Symposium on Signals, Systems and Electronics: 4294491 (2007-07)
  Publisher DOI
• A six-port receiver's analog front-end of reduced size based on a multi-layer layout
  Kölpin, Alexander; Winter, Sebastian M.; Weigel, Robert
  IEEE MTT-S International Microwave Symposium digest(): 4263997 1011-1014 (2007-06)
  Publisher DOI

2006

• A sixport receiver's analog front-end for the K-band based on a rapid-prototyped PCB
  Kölpin, Alexander; Winter, Sebastian M.; Weigel, Robert; Eireiner, Thomas
  13th IEEE Mediterranean Electrotechnical Conference, MELECON: 360-362 (2006-05)
  Publisher DOI