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

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Code: 9A04606

B.Tech IV Year II Semester (R09) Supplementary Examinations July 2018
MICROWAVE ENGINEERING
(Electronics & Communication Engineering)
(For 2009 (LC), 2010, 2011, 2012 regular & 2011 (LC), 2012, 2013 lateral admitted batches only)

Time: 3 hours Max. Marks: 70

Answer any FIVE questions
All questions carry equal marks
*****
1 (a) Draw the field patterns of TE
11
, TE
21
, TM
11
and TM
21
modes in rectangular waveguide.
(b) Justify why TE
10
is dominant mode in rectangular waveguide.

2 (a) State the factors up on which the attenuations constant of a parallel strip line are dependent.
(b) Derive an expression for the attenuation factor of a micro strip line.

3 (a) Explain the construction and working of two choke type movable short circuit used in microwave
circuits.
(b) Write short note on tuning screws and ports.

4 (a) Write the properties of scattering matrix.
(b) Obtain scattering matrix of E-plane Tee junction.

5 (a) What do you mean by O-type tubes? Explain difference between O-type and M-type tubes.
(b) Derive the expression for the distance between cavities of klystron for maximum bunching.

6 (a) What is BWO? Explain its operation with a neat sketch.
(b) Discuss about the performance characteristics and applications of BWO.

7 (a) Draw the schematic diagram of an n-type GaAs diode and explain its operation.
(b) Derive the criterion for classifying the modes of operation for Gunn effect diodes.

8 (a) What is spectrum analyzer? List the types of spectrum analyzer. List some application of
spectrum analyzer.
(b) Describe a microwave bench.

*****
AS
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