Question Paper: RF Modelling and Antennas Question Paper - December 2016 - Electronics and Telecom Engineering (Semester 5) - Mumbai University (MU)
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## RF Modelling and Antennas - December 2016

### MU Electronics and Telecom Engineering (Semester 5)

Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary
1(a) Compare Binomial filter and chebyshev filter. 5 marks

1(b) Comapare Broadside and Endfire array. 5 marks

1(c) Find the gain of an Antenna when physical aperature is 52 at 2GHz with efficiency 70%. 5 marks

1(d) Comapare monopole, Dipole and folded dipole antenna. 5 marks

2(a) Design a composit high pass filter by image parameter method with the following specification.
R0 75Ω fc=50MHz,
f=48MHz.
5 marks

2(b) Derive rediation resistance of small dipole. Explain its significance. 5 marks

3(a) Derive Friss transmission formula state its significance in wireless communication. What is maximum power received at a distance of 0.75km over free space for 1Ghz frequency. The system consist of transmitting antenne with 3dB gain and receiving antenna with 17dB gain antenna is fed with 200 W power. 5 marks

3(b) Explain the structure and functioning of Yagi Uda antenna. 5 marks

4(a) Find the radiation pattern for an array of 4 elements fed with same amplitude and opposite phase. Find its HPBW and BWFN. 5 marks

4(b) Draw the structure of microstrip antenna. Discuss its characteristics, limitations and applications. 5 marks

5(a) Describe parabolic reflector antenna and its different feeding methods. 5 marks

5(b) Explain important features of loop antenna. Discuss use of loop antenna in radio direction finding. 5 marks

### Write short notes on: Q6(a,b,c,d)

6(a) Rf field effect transistor 5 marks

6(a) RF behavior of capacitor and inductor 5 marks

6(b) Binomial array 5 marks

6(d) Helical antenna 5 marks