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B.TECH 5th sem Microwaves and Radar paper 2016

UniversityVTU, Belgaum, Karnataka
CourseB.TECH
Semester5
SubjectMicrowaves and Radar
Year2016
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Heman Sharma
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a. Starting from fundamental, derive the expression for the voltage and current at any point on the transmission line.

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b. A transmission line has the following primary constants, R = 10.4  L = 0.00367 H/km, G=0.8 x 10-6 /km, C =0.00835 F/km. Find  and zo.

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c. Define and derive expression for reflection coefficient and transmission coefficient for a transmission line. 

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a. A load of ZR-115-1752 terminates at a lossless 1000 line. Use Smith chart to determine:(i) SWR, (ii) I/P impedance of a 0.2  long line, (ii) the distance from load to first voltage maximum. 

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b. With neat diagram, explain Faraday's rotation isolator.

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 c. With diagram, explain working of two hole direction coupler and also derive s-matrix for the same. 

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a. Explain with a neat diagram the construction and working of PIN diode and Schottkey barrier diode. 

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b. An M-SI-M BARITT diode has the following parameter:

i) Relative dielectric constant of silicon gr = 11.8

ii) Donor concentration, N = 2.8 x 1021/m

iii) Silicon length, L =6

Determine the breakdown voltage and the breakdown electric field.

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c. What is Gunn'effect? Explain with constructional details of a Gunn diode.

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b. State and explain properties of S-parameters.

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c. Two transmission lines of characteristic impedance z1 and Z2 are joined at plane     pp1.Express s-parameter in terms of impedance.

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a. With neat diagram, explain the working of rotary precision phase shifter. 

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b. Explain H-plane Tee junction and derive the S-matrix also.

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c. A 20 MW signal is fed into one of collinear port 1 of a lossless H-plane T-junction.Calculate power delivered through each port when other ports are terminated in matched load. 

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4. Explain the various losses taking place in microstriplines,

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b. Explain the construction and field pattern for microstripline.

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c. Compare stripline and microstripline.

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a. Derive Radar range equation in terms of effective aperture, radar cross section of target and minimum detectable signal power of receivers.

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b. Discuss various application of Radar.

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c. With respect to Radar system, explain:

i) Maximum unambiguous Range

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 With respect to Radar system, explain:

ii) Clutter attenuationc.

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 With respect to Radar system, explain:

iii) Improvement factor

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 With respect to Radar system, explain:

iv) Doppler shift

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a. Explain MTI Radar with neat block diagram 

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 Write short notes on 

ii) C.W. Doppler Radarb.

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 Write short notes on 

iii) Pulsed Radar

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 Write short notes on 

iv) Blind speed

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b. Write short notes on any two:

i) Delay line canceller  


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Derive the following loss in a microwave network in terms of S-parameter:

i) Insertion loss

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Derive the following loss in a microwave network in terms of S-parameter:

ii) Transmission loss

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Derive the following loss in a microwave network in terms of S-parameter:

iii) Reflection loss

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Derive the following loss in a microwave network in terms of S-parameter:

iv) Return loss

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