AE20 Microwave Theory and Techniques

1. Introduction 2 hours

1.1. Introduction to Microwaves.

1.2. Microwave region and band designations.

1.3. Advantages and application of Microwaves.

1.4. Review of Electromagnetics-Maxwells Equations, Wave equations, TE and TM modes.

I [1, 2]

2. Transmission Lines 8 hours

2.1 Review of transmission line theory.

2.2 Two wire parallel transmission lines: voltage and current relationships in a transmission line, characteristic impedance, reflection coefficient, input impedance.

2.3 Standing waves: VSWR.

2.4 Impedance matching.

2.5 Stub matching.

2.6 Smith Chart.

I [3]; II [3 (3.5, 3.6)]

3. Microwave Transmission Lines 14 hours

3.1 Multiconductor Transmission lines: Coaxial, Strip lines, micro strip lines.

3.2 Parallel striplines.

3.3 Coplanar striplines.

3.4 Shielded strip lines.

3.5 Wave guides: Rectangular, Circular wave guides, Solution of wave equations, TE, TM modes, Dominant mode, Field patterns, cut-off frequencies, wave impedance, attenuation, power handling capacities.

3.6 Open wave guide structures.

3.7 Microwave integrated circuits.

3.8 Cavity resonators: rectangular and circular cavity resonators, resonant frequency, field expressions, field patterns, quality factor, re-entrant cavity, coupling to cavities.

I [4 (4.1, 4.2 (4.2.1-4.2.5), 4.3, 4.4, 4.5), 5]; II [11 (11.1-11.4)]

4. Microwave Components 8 hours

4.1 Wave guide junctions.

4.2 Scattering parameters.

4.3 Microwave T-junctions: E, H, Magic Tees and their scattering matrices, Rat-race junction.

4.4 Directional couplers.

4.5 Wave guide joints.

4.6 Wave guide bends, corners, transitions.

4.7 Other components: twists, irises, posts and tuning screws, coupling probes and loops.

4.8 Ferrite devices: isolators, circulators, phase shifters and attenuators.

I [6]

5. Microwave Measurements 8 hours

5.1 Typical microwave bench set up.

5.2 Measurement of frequency.

5.3 Measurement of power.

5.4 Attenuation.

5.5 Phase shifter.

5.6 VSWR.

5.7 Impedance.

5.8 Insertion loss.

5.9 Dielectric constant.

5.10 Noise factor.

5.11 Q of a cavity resonator.

I [7]

6. Microwave Tubes and Semiconductor Devices 12 hours

6.1 High frequency limitations.

6.2 Klystron amplifier.

6.3 Klystron oscillator.

6.4 TWT.

6.5 Magnetron.

6.6 Microwave transistors.

6.7 MESFETs.

6.8 Varactor diodes.

6.9 Parametric amplifiers.

6.10 PIN.

6.11 SBD.

6.12 Transferred Electron devices: Gunn diode.

6.13 Avalanche Transit Time devices: IMPATT, TRAPATT, BANTT.

6.14 MASERS.

I [ 8, 9]

7. Microwave Communication Systems 8 hours

7.1 Propagation modes.

7.2 Analog microwave communications: LOS, OTH, LOS range calculation, repeaters, tropospheric wave field strength calculation.

7.3 Fading.

7.4 Duct propagation.

7.5 Digital microwave communications.

7.6 Microwave antennas.

7.7 Typical applications-satellite communications and radars as typical applications.

I [10, 11(11.1-11.7, 11.9, 11.11-11.15)]

Text Books:

I. M.Kulkarni "Microwave and Radar Engineering" Third Edition, Umesh Publications (2003)

II.S. Y. Liao "Microwave Devices and Circuits" Third Edition, PHI (1990)

Reference Books:

1. R.E.Collin "Foundations of Microwave Engineering, McGraw Hill (1992)

2. Om.P.Gandhi "Microwave Engineering and Applications" Maxwell Macmillan International Ed. (1989)