Microwave Networks and Circuits

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Microwave Networks and Circuits

Course Description

Transmission lines: microstrip line, stripline. Coaxial line. One-port and multi-port microwave networks, impedance, admittance, transmission and scattering matrices, signal flow graphs. Two-port networks: attenuator, ferrite isolator, phase shifter. Three-port networks: circulator, power dividers. Four-port networks: directional couplers and hybrids. Microwave resonators and filters. Microwave semiconductor devices: PIN diode, varactor diode, Schottky diode, bipolar transistor, HBT, MOSFET, MESFET, HEMT. Microwave amplifiers: power gain definitions, stability, amplifier design for specified gain and noise figure. Microwave oscillators: Gunn oscillator, transistor oscillator, injection-locking, phase noise. Mixer, mixing.

Learning Outcomes

analyze networks and circuits with distributed parameters
explain the operation and application of multi-port microwave circuits
design microstrip transmission lines and circuits consisting of such lines
explain operation principles and applications of microwave semiconductor devices
design simple active microwave circuits with semiconductor elements
explain the operation of the microwave oscillator
explain the principles of frequency synthesis
explain the principles of mixing and frequency conversion

Forms of Teaching

Lectures

Lectures present theoretical concepts, existing mathematical models and examples from practice.

Exercises

Classroom exercises allow the application of concepts from lectures in solving practical examples.

Independent assignments

Independent tasks deepen understanding and develop independence in solving practical problems.

Laboratory

The laboratory complements the development of problem-solving skills through self-contained and team solving of more complex problems.

Grading Method

	Continuous Assessment		Exam
Type	Threshold	Percent of Grade	Threshold	Percent of Grade
Laboratory Exercises	50 %	0 %	0 %	0 %
Mid Term Exam: Written	0 %	25 %	0 %
Final Exam: Written	50 %	25 %
Final Exam: Oral		50 %
Exam: Written			50 %	50 %
Exam: Oral				50 %

Comment:

Week by Week Schedule

Port and reference plane. One-port network. Impedance. Foster's reactance theorem. Two-port and multi-port networks. Impedance and admittance matrices (Z-, Y-parameters). Power waves, scattering parameters. Transmission matrix (ABCD-parameters). Reciprocal network, matched network, lossless network.
Quarter-wave impedance transformer. Coaxial transmission line. Stripline, microstrip line.
Signal flow graphs. Graph decomposition. Mason's rule. Two-port networks (attenuator, ferrite isolator, phase shifter).
Three-port networks (ferrite circulator, T-junction, resistive power divider, Wilkinson power divider).
Directions coupler (symmetrical and asymmetrical). Waveguide and transmission line couplers, hybrids. Quadrature hybrid, 180° hybrid, even and odd mode analysis.
Serial and parallel resonant circuit, quality factor and bandwidth. Transmission line resonators, cavity resonators, dielectric resonators. Excitation of resonators. Coupling with external circuits.
Filter synthesis. Maximally flat response filters. Equal-ripple response filters. Elliptic function filters. Impedance and frequency scaling. Richard's transformation. Kuroda's identities. Microwave filter prototypes.
Midterm exam
PIN diode. Varactor diode. Schottky diode. Gunn element. Microwave avalanche diodes. Microwave bipolar transistors, HBT. Microwave field effect transistors, MOSFET, MESFET, HEMT.
Power gain definitions. Amplifier stability, stability circles. Unilateral amplifier, unilateral figure of merit. Amplifier design for specified gain. Amplifier design for specified noise figure.
Collpits and Hartley oscillator circuits. Voltage controlled oscillator. Crystal oscillators. Oscillators with one-port device (Gunn oscillator). Microwave transistor oscillators.
Injection locking. Oscillator phase noise.
Direct frequency synthesizers. Phase-locked loop frequency synthesizers. Digital look-up frequency synthesizers.
Mixer circuits, analysis and design of mixers.
Final exam