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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
PDDC SEMESTER VII- EXAMINATION SUMMER 2017
Subject Code: X71101 Date: 27/04/2017
Subject Name: MICROWAVE ENGINEERING
Time: 02.30PM to 05.00PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1

Define Reflection Coefficient, VSWR, Phase velocity, Group velocity, Guided wavelength, Return loss and Insertion loss.
07

Draw neat diagram of Microwave system. Also list advantages of microwave and its applications.
07
Q.2

Draw equivalent circuit of transmission line and derive basic equations for voltage and current on transmission line. Define characteristic impedance of transmission line.
07

Define impedance matching and also explain single stub matching.
07
OR

A 700 lossless transmission line is fed by a 50 generator. If the line is 200 m long and terminated by load of 500 Determine in dB: reflection loss, transmission loss, and return loss.
07
Q.3

Derive the solution of TE mode in rectangular waveguide.
07

Explain the principle of operation and working of Magnetron with neat diagram.
07
OR
Q.3

Explain Working of reflex klystron. Compare it with two cavity klystron.
07

Explain directional coupler. Define coupling factor, directivity.
07
Q.4

Explain limitation of conventional tubes at Microwave frequencies.
07

Explain in detail applications of Magic Tee.
07
OR
Q.4

Explain in detail Gyrator and Isolator.
07

Explain the solution of H-plane Tee with its s-parameter.
07
Q.5

Draw block diagram of pulse radar and explain each block. List different types of display used.
07

Derive Distributed parameters, characteristic impedance and attenuation
losses for parallel strip lines.
07
OR
Q.5

What do you mean by Doppler effect? Explain operation of MTI radar.
07

What is Gunn effect? Explain working of GaAs diode.
07