ANTENNA & WAVE PROPAGATION PAPER 3

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ANTENNA & WAVE PRPAGATION (New) ECE 303 5TH Sem May 2k5

Note: Section A is compulsory. Attempt any Four questions from Section B and two from Section C.

Section A Marks 2 each

1.

1. What is Isotropic radiator?
2. Define directivity.
3. How is antenna efficiency calculated?
4. What does the effective length of an antenna represent?
5. Define antenna bandwidth.
6. Where is parasitic array used?
7. Define the term polarization.
8. What does lower value of Q in an antenna indicate?
9. What is duct propagation?
10. Define skip distance.

Section B Marks 5 each

2. Discuss the features of linear wire antennas.

3. Explain the working of a Horn antenna.

4. Describe the Surface wave propagation for vertical and horizontal dipole.

5. How is antenna temperature measured?

6. Discuss the effect of earth imperfections and atmosphere on space wave propagation.

Section C Marks 10 each

7. Compare the features of various antenna arrays.

8. Compare the ground wave, space wave and ionospheric propagation.

9. Write notes on:
(a) Reflector antenna
(b) Antenna input impedance.