0
640views
RF Modelling And Antennas Question Paper - May 17 - Electronics And Telecomm (Semester 5) - Mumbai University (MU)
1 Answer
0
2views

RF Modelling And Antennas - May 17

Electronics And Telecomm (Semester 5)

Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.

1.a. Compare Binomal filter and chebyshev filter.
(5 marks)

1.b. What is reactive near field. Explain its importance in communication and its applications.
(5 marks)

1.c. Compare Broadside and Endfire array.
(5 marks) 00

1.d. Find the gain of an antenna when physical aperture is 5 $\mathrm{m}^{2}$ at 2 GHz with efficiency 70%.
(5 marks)

2.a. Design a composit high pass filter by image parameter method with the following specification. $\mathrm{R}_{0}=75 \Omega, \mathrm{f}=50 \mathrm{MHz}, \mathrm{f}=48 \mathrm{MHz}$.
(5 marks) 00

2.b. Design a LPF whose input and output ports are matched to 50$\Omega$ impedance with cut off frequency of 3 GHz, equi ripple of 0.5 dB and rejection of atleast 40 dB at approx twice the cut off frequency.
(5 marks)

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

3.b. Derive radiation resistance of small dipole. Explain its significance.
(10 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.
(10 marks)

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

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

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

Write short notes on

6.a. RF field effect transistor
(5 marks)

6.b. Binomial array
(5 marks) 00

6.c. RF behaviour of resistor and capacitor
(5 marks) 00

6.d. Helical antenna
(5 marks) 00

enter image description here

Please log in to add an answer.