Microwave Engineering 5h2c1q

MICROWAVE ENGINEERING UNIT I MICROWAVE N/W CHARACTERIZATION & IVE COMPONENTS Circuit and S parameter representation of N ports- Reciprocity Theorem- Lossless networks and unitary conditions- ABCD parameters-Cascaded networks-Relations between S- Y and ABCD parameters- Effect of changing the reference planes in the S matrix- S Matrix of a Directional Coupler- waveguide tees and rat race coupler- Qualitative discussion on: Waveguide CornersBends- Twists- Matched loads and movable shorts.

UNIT II

MICROWAVE TUBES

Transit time effect- Velocity modulation –current modulation-bunching-Two cavity Klystron amplifier- Reflex Klystron- Slow-Wave structures -Helix Traveling-Wave Tubes- Convection Current- Axial Electric Field- Wave Modes- Bandwidth, Power and Gain Considerations – cross field device –Magnetron-power and frequency considerations

UNIT III

MICROWAVE MEASUREMENTS

Slotted line VSWR measurement- impedance measurement- insertion loss and attenuation measurements- measurement of scattering parameters - Return loss measurement using directional coupler-Introduction to vector network analyzer and its uses- return loss and insertion loss

UNIT IV

Microwave semiconductor devices

Gunn-Effect – Gunn Diode- Differential Negative Resistance- Modes of OperationAmplification- Microwave Generation- Read Diode- Physical Description- Avalanche Multiplication- IMPATT Diodes- TRAPATT Diode- BARITT Diode- Principles of OperationPhysical Structures- Parametric Amplifiers -Nonlinear Reactance and Manley – Rowe Power Relations.

UNIT V

STRIP LINES

Introduction- Microstrip Lines- Derivation of Characteristic Impedance of Microstrip Lines using Quasi Static analysis- Losses in Microstrip Lines- Quality Factor Q of Microstrip Lines- Substrate materials-surface wave excitation- Parallel Strip Lines- Characteristic Impedance- Attenuation Losses- Coplanar Strip Lines- Shielded Strip Lines- Problems- Microstrip based broadband matching networks TOTAL: 45

TUTORIAL : 15 TEXT BOOKS

1. Samuel Y-LIAO : Microwave Devices and Circuits – Pearson/Prentice Hall of India – 3rd Edition (2003) . 2. Annapurna Das and Sisir K-Das: Microwave Engineering – Tata McGraw-Hill (2000).

REFERENCES:

3. R-E- Collin : Foundations for Microwave Engg- – IEEE Press Second Edition (2002) . 4. David M-POZAR : Microwave Engg- – John Wiley & Sons – 2nd Edition (2003) . 5. Rizzi “ microwave engineering-ive circuits “ PHI 2007