Wireless Systems for Mobile Applications

Lecturer: Prof. Alexander Kölpin

Contents:

• Mobile radio channel: radio channel properties, radio channel modeling, modulation techniques, digital modulation

• Mobile communication systems: Car-2-X, hybrid and ultra-low power communication systems (wake-up receivers, sub-GHz systems, RFID)

• Radar: Pulse, Doppler and Continuous Wave, FMCW radar

Microwave Semiconductor Devices and Circuits I

Lecturer: Prof. Alexander Kölpin

Contents:

• Amplifier: S-Parameters, stability, gain definitions; Bipolar Junction Transistor and HBT, MESFET and HEMT; Circuit applications, nonlinear distortions, low noise and power amplifier

• Mixer: Conversion matrix analysis; pn- and Schottky-diode, FET; Circuit applications, conversion gain and noise figure

• Oszillator: Oscillation start-up, steady state operation, stability; IMPATT-diode, Gunn-element, FET; oscillator stabilization

• Linear passive circuits: Planar microwave circuits, quarterwave matching circuits and discontinuities, lowpass-filter and bandpass-filter synthesis

• Design of active circuits

Machine Learning in Electrical Engineering and Information Technology

Lecturer: Prof. Alexander Kölpin

Contents:

Modern high-frequency systems benefit massively from machine learning methods. In applications where rule-based algorithms reach their limits, these data-driven approaches enable a significant increase in resolution and accuracy. This is exemplified by current research challenges, namely for the classification of targets in autonomous driving radar systems, radar-based gesture recognition for smart home applications and device control as well as in the field of medical technology for the contactless monitoring of human vital signs.

Circuit Theory

Lecturer: Prof. Alexander Kölpin

Contents:

• Circuit theorems

• N-port circuits

• Periodic excitation of linear circuits

• Transient analysis in time domain

• Transient analysis in frequency domain; Laplace Transform

• Frequency behaviour of passive one-ports

Microwave Engineering

Lecturer: Prof. Alexander Kölpin

Contents:

• Antennas: Analysis - Characteristics - Realizations

• Radio Wave Propagation

• Transmitter: Power Generation with Vacuum Tubes and Transistors

• Receiver: Preamplifier - Heterodyning - Noise

• Selected System Applications

Microwave Semiconductor Devices and Circuits II

Lecturer: Prof. Alexander Kölpin

Contents:

• Frequency multiplier: Harmonic balance, noise in nonlinear circuits; Step Recovery Diode, FET; circuit synthesis, large signal, noise, and stability analysis

• Low Noise Amplifier (LNA) circuit design: Stability and stability circles, gain and gain circles, noise, noise figure and noise figure circles

• Mixer, oscillator: Measurement techniques (Network analyzer, Spectrum analyzer, Frequency generator)

• Design of active circuits

Additionally to this module a practical exercise is offered where students design, build and evaluate komponents of a X-band satellite receiver (Low-Noise Amplifier, Mixer, Oscillator) in small groups.

Seminar on Microwave Engineering

Contents:

• Seminar talks on selected subjects