Question Paper: Microwave And Radar Engineering Question Paper - May 18 - Electronics And Telecomm (Semester 7) - Mumbai University (MU)
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## Microwave And Radar Engineering - May 18

### Electronics And Telecomm (Semester 7)

Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question No. 1 is compulsory.
(2) Attempt any three from remaining five questions.
(3) Assume suitable data if required.
(4) Figures in brackets on the right hand side indicate full marks.

1(a) What is meant by RADAR range?
(5 marks) 00

1(b) Discuss the characteristics of microwaves.
(5 marks) 00

1(c) Given the circuit shown in Fig. 1(C), design a lumped element matching network at 60 MHz that would transform Load impedance Z$_L$= 100-j25$\Omega$ into an input impedance of Z= 25+j15$\Omega$. Take Z$_0$= 50$\Omega$.

(10 marks) 00

2(a) With a neat functional diagram explain the working principle of Cylindrical Magnetron.
(10 marks) 1470

2(b) Write a short note on circular waveguide.
(10 marks) 987

3(a) Explain working of TRAPATT.
(10 marks) 1000

3(b) Radar operating at 1.5 GHz uses a peak pulse power of 2.5 MW and has a range of 100 nmi for objects whose radar cross section is 1m$^2$. If the minimum receivable power of the receiver is 2*10$^{-13}$ Watt, what is the smallest diameter of the antenna reflector could have assuming it to be a full paraboloid with $\eta$=0.65
(10 marks) 1008

4(a) Explain any one bio-medical application using microwave.
(10 marks) 00

4(b) match a load impedance Z$_L$= 60-j80 to a 50$\Omega$ line using a double stub tuner. The stubs are open circuited and are spaced $\lambda$/8 apart. The match frequency is 2 GHz.
(10 marks) 1454

5(a) With block diagram explain the MTI radar system. Give its limitations.
(10 marks) 1004

5(b) Explain Doppler Shift and its role in pulsed and CW RADAR.
10 marks) 1002

Q6) Write a short note on following:

• a) Phase shifters
• b) Reflex Klystron
• c) Gunn diode 998

• d) Clutter 1006

(20 marks) 00