SRM University 2007 B.Tech Electronics and Communications Engineering Bank : Antennas and Wave Propagation - Question Paper

10. How does a log periodic antenna give a large bandwidth of operation?
11. discuss the principle of operation and applications of loop antenna.
12. Write detailed notes on (a) Horn antennas (b) Frequency independent antennas.
13. discuss the principle of operation and applications of loop antenna.
14. discuss in detail the working principle of Helical antenna in
(a) Normal mode (b) Axial mode
15. discuss in detail the design aspects of Microstip antenna.

UNIT-IV – Radio Wave Propagation
PART-A
1. What are the different modes of Propagation?
2. What is Duct Propagation
3. What do you mean by ground Wave Propagation
4. What do you mean by Sky Wave Propagation
5. What do you mean by Space Wave Propagation
6. What do you mean by Troposphere Scatter Propagation
7. Write short notes on Structure of Troposphere
8. Write short notes on Structure of Ionosphere layers
9. Write short notes on D region
10. Write short notes on Normal E region
11. Write short notes on Sporadic E region
12. Write short notes on F region
13. What is Critical Frequency
14. What is Magneto Ionic Splitting?
15. Define Gyro Frequency
16. Define Virtual Height
17. Define Maximum Usable Frequency(MUF)
18. Define Skip Distance
19. Define Optimum Working Frequency(OWF)
20. State a few Ionospheric abnormalities
21. Define Sun Spot Cycle
22. Define Fading and Mention its kinds
23. What are Whistlers
24. What do you understand by Multi hop Propagation?
25. Write the ranges for different layers of atmosphere.
PART-B
1. Explain briefly the different modes of Propagation
2. Explain Ground Wave Propagation in detail
3. Explain the Structure of Atmosphere
4. Explain the different layers of Ionosphere
5. Explain the effect of Earth’s Magnetic Field on Radio wave Propagation
6. Explain Virtual Height and derive the Expression
7. Explain Maximum Usable Frequency and show how to compute MUF
8. Explain (a) Skip Distance (b) Optimum Working Frequency
9. Explain briefly about Ionospheric abnormalities
10. Determine the Effective Earth’s Radius in Space Wave Propagation
11. Explain Super Refraction.

UNIT V - ANTENNA MEASUREMENTS
PART A
1. What are the kinds of antenna measurements?
2. Define Impedance measurements.
3. Define trend measurements.
4. Define Gain of antenna.
5. Define Radiation Resistance.
6. Define Transmission bandwidth of an antenna.
7. Define Power Gain.
8. Define VSWR.
9. What is standing wave ratio method of impedance measurements?
10. Define Radiation trend measurements.
11. Define Directivity.
12. Define antenna Radiation Efficiency.
13. Define Polarization measurement.
14. Define Antenna Aperture Efficiency.
15. List the various methods used for measuring the Polarization.
16. Define Vertical Incidence measurement.
17. Define Oblique incidence measurement.
18. Give the relation ranging from Vertical and Oblique incidence transmission.
19. Determine the gain and beam width for a parabolic antenna with 10M-diameter dish and dipole feed at 10GHz.
20. Define Beam width of antenna.

PART B

1. Describe the methods for measuring the gain and beam width of antenna.
2. Describe the methods for measuring the Power gain, Radiation efficiency and Transmission bandwidth of an antenna.
3. Describe the Slotted line technique for Impedance measurement.
4. Describe how the radiation trend and Radiation resistance of a provided antenna can be measured experimentally.
5. Derive the relation ranging from oblique and vertical incidence transmission.
6. Write short notes on Vertical incidence measurement of the ionosphere.
7. Write short notes on Oblique incidence measurement of the ionosphere.
8. Describe briefly about Polarization measurements.
9. Derive an expression to determine Antenna efficiency and Antenna Aperture.
10. Derive an expression to determine the Directivity of an antenna.

Earning:   Approval pending.