Course curriculum

  • 1

    UNIT-1

    • Introduction to microwave transmission lines Microwave spectrum and bands, applications of microwaves

    • Rectangular Waveguides-Solution of wave equation in rectangular coordinates, TE/TM mode analysis

    • Rectangular Waveguides

    • Mode characteristics- Phase and Group velocities

    • Wavelengths and Impedance Relations, Power Transmission, Impossibility of TEM Mode. Illustrative Problems, Micro strip Lines– Introduction, Effective Dielectric Constant.

    • Q-factor, Cavity resonators-introduction, Rectangular and cylindrical cavities, dominant modes and resonant frequencies, Q-factor and coupling coefficients, Illustrative Problems
  • 2

    Unit-2

    • WAVEGUIDE COMPONENTS AND APPLICATIONS

    • Coupling mechanisms- probe, loop, aperture types. Wave guide discontinuities-waveguide Windows, tuning screws and posts, matched loads.

    • Waveguide attenuators-resistive card, rotary vane Attenuators

    • Waveguide phase shifters-dielectric, rotary vane phase shifters.

    • Directional couplers-2 hole, Bothe hole types, Wave guide multiport junctions-E plane and H plane Tees, Magic Tee
  • 3

    UNIT-3

    • Microwave Tubes: Limitations and Losses of conventional Tubes at Microwave Frequencies, Microwave Tubes – O Type and M Type Classifications, O-type Tubes

    • 2 Cavity Klystrons – Structure, Reentrant Cavities, Velocity Modulation Process and Applegate Diagram, Bunching Process and Small Signal Theory – Expressions for O/P Power and Efficiency

    • Reflex Klystrons – Structure, Velocity Modulation and Applegate Diagram, Mathematical Theory of Bunching, Power Output, Efficiency, Oscillating Modes and O/P Characteristics

    • Helix TWTs: Significance, Types and Characteristics of Slow Wave Structures; Structure of TWT and Amplification Process (qualitative treatment), Suppression of Oscillations, Gain Considerations
  • 4

    UNIT-4

    • M-TYPE TUBES: Introduction, cross field effects, Magnetrons-different types, cylindrical travelling wave magnetron-Hull cutoff and Hartree conditions

    • modes of resonance and PI-mode operation, separation of PI-mode, O/P characteristics, Illustrative Problems

    • MICROWAVE SOLID STATE DEVICES: Introduction, classification, applications, Transfer Electronic Devices, Gunn diode-principles
  • 5

    UNIT-5

    • Scattering Matrix– Significance, Formulation and Properties, S Matrix Calculations for – 2 port Junctions, H plane Tees,

    • S Matrix for E plane and H plane Tees, Magic Tee

    • S Matrix for Directional Coupler, Isolator & Circulator

    • Microwave Measurements: Description of Microwave Bench – Different Blocks and their Features, Errors and Precautions, Microwave Power Measurement, Bolometers.

    • Measurement of Attenuation, Measurement of Low and High VSWR

    • Measurement of Q of Cavity Resonator, Impedance Measurements, Illustrative Problems