MICROWAVE ENGINEERING

MICROWAVE ENGINEERING UNIT I MICROWAVE N/W CHARACTE RIZATION RIZATION & PASSIVE COMPONENTS

Circuit and S parameter parameter representation representation of N ports- Reciprocity Theorem- Lossless networks and unitary conditions- ABCD paramet pa rameters-Cascaded ers-Cascaded networks-Relations between S- Y and ABC D parametersparameters- Effect of changing changing the reference planes in i n the S matrixmatrix- S Matrix Matrix of a Directional Coupler- waveguide wavegui de tees and rat race coupler- Quali Qualitative tative discussion on: Waveguide CornersC ornersBends- TwistsTwi sts- Matched Matched loads and movable shorts.

UNIT II

MICROWAVE TUBE S

Transit time effecteffect- Velocity modulation –current modulation-bunching-Tw o cavity Klystron Kl ystron amplifier- Reflex Klystr Kl ystronon- Slow-Wave Slow -Wave structures structures -Heli -Helix x Traveling-Wave Tubes- Convection Con vection Current- Axial Electric E lectric FieldField - Wave ModesModes- Bandwidth, Bandwid th, Power and Gain Considerations Consi derations – cross field device –Magnetr – Magnetron-power on-power and frequency considerations

UNIT III

MICROWAVE MEASUREMENT MEASU REMENTS S

Slotted line li ne VSWR VS WR measurement- impedance measurement- insertion insertion loss l oss and attenuation measurementsmeasurements- measurement of scattering scattering parameters parameters - Return loss measurement using directional coupl er-Introduct er-Introduction ion to vector network analyzer and i ts uses- return return loss and insertion loss

UNIT IV

Microwave Microwave semiconductor devices

Gunn-Effect Gunn-Effect – Gunn DiodeDi ode- Diff Di fferential erential Negative N egative ResistanceResi stance- Modes of OperationOperation Amplification- Microwave GenerationGeneration- Read Diode- Physical Description- Avalanche Multiplication- IMPATT Diodes- TRAPATT Diode- BARITT Diode- Principles of OperationPhysical Struct S tructuresures- Parametric Parametric Amplifiers -Nonlinear Reactance and Manley – Row e Power  Relations.

UNIT V

STRIP LINES

IntroductionIntroduction- Microstrip Microstrip LinesL ines- Derivation of Characteristic Impedance of Microstrip Microstrip Lines Lin es using Quasi Static analysisanal ysis- Losses in i n Microstrip Lines- Quality Quali ty Factor Q of Microstrip Microstrip LinesLin es- Substrate materials-surface materials-surface wave excitation- Parallel Parall el Strip S trip Lines- Characteristic Impedance- Attenuation Attenuation Losses- Coplanar Strip Lines- Shiel ded Strip Lines- Problems- Microstrip 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-passive circuits “ PHI 2007