Radiation & Microwave Theory (RMT) SPPU Insem Question Paper Sep 2024

Questions

1. Q1

   1. a)

      A free space microwave link operating at 10GHz consists of transmitting and receiving antennas each having gain of 30dB. The distance between the two antennas is 20km and the power radiated by the transmitter antenna is 15W. Calculate the received power and path loss in db.

      [5]
   2. b)

      Explain the following terms : i) Antenna gain ii) Radiation Intensity iii) Directivity

      [6]
   3. c)

      Explain radiation pattern of antenna.

      Also asked:Aug 2025

      [4]
   OR

2. Q2

   1. a)

      Define Antenna. Explain types of antenna.

      [5]
   2. b)

      Explain : i) Bandwidth ii) Beamwidth iii) Effective area

      [6]
   3. c)

      Describe various field regions of radiation for antennas. 2

      [4]

3. Q3

   1. a)

      An air filled rectangular waveguide of inside dimensions 7cm × 3.5cm operates in the dominant TE10 mode i) find the cut off frequency ii) determine the phase velocity of the wave in the guide at a frequency of 3.5GHZ.

      [5]
   2. b)

      Describe advantages and applications of Microwaves in detail.

      [6]
   3. c)

      Explain various types of coupling methods.

      [4]
   OR

4. Q4

   1. a)

      Write short note on stripline.

      [4]
   2. b)

      Find the resonant frequencies of the dominant mode of an air filled rectangular cavity of dimensions 5cm × 4cm × 2.5cm. The dominant mode for rectangular cavity resonator is TE 101 .

      [4]
   3. c)

      What is a waveguide? Describe the following parameters of waveguide : i) Cutoff frequency ii) Group velocity iii) Phase velocity iv) Guided wavelength 

      [7]