Download JNTUA B.Tech 4-2 R13 2018 April AS 9A04606 Microwave Engineering Question Paper

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Code: 9A04606

B.Tech IV Year II Semester (R09) Supplementary Examinations April 2018

MICROWAVE ENGINEERING

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(Electronics & Communication Engineering)

Time: 3 hours

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Max. Marks: 70

Answer any FIVE questions

All questions carry equal marks

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1. (a) Discuss how the microwave spectrum is categorized into different bands.
   (b) What is the need of microwave frequency? Explain different applications of microwaves.
   

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2. (a) Draw the microstrip line schematic diagram and explain how signal propagates in it.
   (b) Explain the methods of exciting a resonator cavity.
   

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3. Explain the construction and working of precision variable attenuator. Discuss its frequency response and reflection losses.


4. A three port circulator has an insertion loss of 1 dB, an isolation of 20 dB and VSWR of 1.2. Find the output power at port 2 and 3 for an input power of 100 mW at port 1.



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5. (a) Why two-cavity klystron is widely used in microwave amplifiers?
   (b) Derive an expression for power output of a 2-cavity klystron amplifier specify maximum valve of efficiency that can be obtained.
   


6. With neat diagrams and relevant equations, explain about cylindrical and coaxial magnetron.

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7. (a) What are the various frequency modes in which Gunn effect oscillator can be made to oscillate? Explain each mode in detail.
   (b) Draw the current waveform of an n-type GaAs and discuss.
   



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8. (a) Write short notes on the measurement of noise factor.
   (b) Distinguish between slotted-line technique and wave meter techniques of frequency measurement.
   

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