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Radiation and Microwave Techniques Question Paper - Dec 18 - Electronics And Telecomm (Semester 7) - Pune University (PU)
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Radiation and Microwave Techniques - Dec 18
Electronics And Telecomm (Semester 7)
Total marks: 70
Total time: 150 mins
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.
1.a.
Define the antenna polarization and explain linear, circular , elliptical polarization with relevant expression and illustrative diagram.
(8 marks)
00
1.b.
Explain the construction and principle of operation for Yogi Uda antenna.
(6 marks)
00
1.c.
For an air filled rectangular wave guide of dimension a = 2 $\mathrm{cms}$ and b = 1 cms. Calculate cutoff wavelength for $\mathrm{TE}_{10}$ and $\mathrm{TM}_{11}$ mode. Also calculate guide wavelength at 10GHz.
(6 marks)
00
OR
2.a.
For an array of four isotropic sources along z axis separated by a distance of $\lambda / 2$ and a progressive phase shift of $\alpha=0$ , find null direction, maxima direction, direction of side lobe maxima and HPBW.
(8 marks)
00
2.b.
Define & explain following Antenna parameters
(6 marks)
00
i) Directivity
ii)Effective Area
iii) Gain
2.c.
Why waveguides are required at microwave frequencies? Explain
following parameters of waveguide.
(6 marks)
00
i) Cutoff frequency
ii) Guide wavelength
3.a.
Explain the properties of E plane Tee with the help f neat diagram.Also derive its Scattering matrix.
(8 marks)
00
3.b.
Explain faraday's rotation principle .Explain in brief the working principle of an isolator.
(8 marks)
00
OR
4.a.
Define with expression the following parameter of directional coupler
(5 marks)
00
i) Coupling factor
ii) Directiviy
iii) Insertion loss
4.b.
A signal of power 32mw is fed into one of the collinear ports of a loss less H plane Tee. Determine the power in the remaining ports when other ports are terminated by means of matched load.
(6 marks)
00
4.c.
Explain the operation of circulation using two magic tees.
(4 marks)
00
5.a.
what are linear beam tubes? Explain construction, operation & advantage
of TWT amplifier?
(8 marks)
00
5.b.
Explain Gunn effect with the help of two valley model. Also explain V-I
characteristics and applications of Gunn diode.
(8 marks)
00
OR
6.a.
With the help of construction & applegate diagram explain working of
Reflex Klystron?
(8 marks)
00
6.b.
Explain working principle of Tunnel diode.
(5 marks)
00
7.a.
Explain Microwave Satellite Communication System. Also differentiate
between Satellite and Terrestrial Communication System.
(10 marks)
00
7.b.
Explain measurement techniques for VSWR.
(8 marks)
00
OR
8.a.
Explain with neat block diagram power measurement of microwave
generator using:
(10 marks)
00
i) Bolometer
ii) Calorimeter.
8.b.
Explain attenuation measurement using power ration measurement technique. What is the drawback of power ration measurement technique
for attenuation measurement? Explain attenuation measurement using RF substitution method.
(8 marks)
00
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