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Name of the College : Kings College Of Engineering
Department : Electronics & Communication Engineering
Subject : Antennea & Wave Propagation
Website : kings.ac.in
Document Type : Question Bank

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Antennea & Wave Propagation Question Paper

Unit I

Antenna Fundamentals:
Part – A : (2 Marks)
1. Define an antenna.
2. What is meant by radiation pattern?
3. Define Radiation intensity

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4. Define Beam efficiency
5. Define Directivity
6. What are the different types of aperture?
7. Define different types of aperture
8. Define Aperture efficiency
9. What is meant by effective height?
10. What is the field zone?

11. What is meant by Polarization?
12. What is meant by front to back ratio?
13. Define antenna efficiency
14. What is radiation resistance?
15. What is meant by antenna beam width?
16. What is meant by reciprocity Theorem?
17. What is meant by isotropic radiator?
18. Define gain.
19. Define self impedance.
20. Define mutual impedance
21. What is meant by cross field?
22. Define axial ratio
23. What is meant by Beam Area?
24. What is duality of antenna?
25. What is point source?
26. What is meant by array?
27. What is meant by uniform linear array.?
28. What are the types of array?
30. What is Broad side array?
31. Define End fire array
32. What is collinear array?
33. What is the condition on phase for the end fire array with increased directivity?
34. Define array factor.
35. Define beam width of major lobe?
36. List out the expression of beam width for broad side array and end fire array.

Part – B :
1. With neat sketch, explain the operation of helical antenna? (16)
2. Obtain the expression for the field and the radiation pattern produced by a 2 element array of infinitesimal with distance of separation 1/2 and currents of unequal magnitude and phase shift 180 degree? (16)
3. Derive the expression for far field components of a small loop antenna. (16)
4. Derive the expression for electric field of a broadside array of n sources and also find the maximum direction minimum direction and half power point direction? (16)
5. Design a 4 element broadside array of 1/2 spacing between elements, the pattern is to be optimum with a side lobe level 19.1 db. Find main lobe maximum? (16)
6. Explain pattern multiplication? (8)
7. Derive the expression for electric field of an end fire of n sources and also find the maximum direction minimum direction and half power point direction? (16)
8. Write short notes a radiation resistance? (8)
9. Calculate the maximum effective aperture of a 1/2 antenna? (8)
10. Derive the maxima directions, minima directions, and half power point direction for an array of two point sources with equal amplitude and opposite phase? (16)
11. Explain the various types of amplitude distributions in details? (16)

Unit II

Radiation Fields Of Wire Antennas :
Part – A :(2 Marks)
1. What is the radiation resistance of a half wave dipole?
2. What is a Short Dipole?
3. How radiations are created from a short Dipole?
4. Why a short dipole is also called an elemental dipole?
5. What is a Infinitesimal Dipole?
6. Why a short dipole is called a oscillating dipole?
7. What do you understand by retarded current?
8. Define induction field
9. Define Radiation field
10. At what distance from the dipole is the induction field equal to the radiation field?
11. Define Radiation Resistance
12. Give the expression for the effective aperture of a short dipole
13. What is a dipole antenna?
14. What is a half wave dipole?
15. Give the expression for the effective aperture of a Half wave Dipole
16. What is a loop antenna?
17. Give an expression of radiation resistance of a small loop
18. How to increase the radiation resistance of a loop antenna
19. What are the types of loop antennas?
20. What are Electrically Small loop antennas?
21. What are electrically large loop antennas?
22. List out the uses of loop antenna
23. What is capacitance hat?
24. Define top loading
25. Define retardation time

Part – B :
1. Derive the expression for the radiated field from a short dipole? (16)
2. Starting from first principles obtain the expression for the power radiated by a half wave dipole? (16)
3. Derive the expression for power radiated and find the radiation resistance of a half wave dipole? (16)
4. Derive the radian resistance, Directivity and effective aperture of a half wave dipole? (8)
5. Derive the fields radiated from a quarter wave monopole antenna? (8)
6. Find the radiation resistance of elementary dipole with linear current distribution? (8)
7. Derive the radian resistance, Directivity and effective aperture of a Hertzian dipole? (8)
8. Derive the power radiated and radiation resistance of current element. (8)
9. Explain in detail assumed current distribution for wire antennas (8)
10. Write in brief about the use of capacitance hat and loading coil for short antennas. (8)

Unit III

Traveling Wave (Wide Band) Antennas :
Part – A : ( 2 Marks)
1. Name and draw a frequency independent antenna
2. What is yagi -uda antenna?
3. What do you mean by parasitic element?
4. What do you mean by driven elements?
5. What is the purpose of using more directors in yagi uda antenna?
6. Why folded dipole antenna is used in yagi antenna?
7. What is beam antenna?
8. Which antenna is referred to super gain or super directive antenna?
9. What is a frequency independent antenna?
10. Why log periodic antenna is named so far?
11. What is the condition for an antenna to be frequency independent?
12. What is LPDA?
13. What are the different regions in log periodic antenna and how are they differentiated?
14. Give the expression for design ratio, spacing factor and frequency ration of log periodic antenna.
15. What are the applications of log periodic antenna?
16. What are the applications of Rhombic antenna?
17. Define rhombic antenna.
18. What are the two types of rhombic antenna de
19. What are the limitations of rhombic antenna?
20. What do you mean by self-impedance?
21. What is mutual impedance?
22. What is the effect of decreasing angle a?
23. Define a raveling wave antenna.
24. What is the advantage of traveling wave antenna?
25. What is beverage or wave antenna?
26. What is the type of radiation pattern produced when a wave travels in a wire? Draw the pattern.

Part – B :
1. Explain the radiation from a travelling wave on a wire ? (8)
2. What is Yagi-uda Antenna? Explain the construction and operation of Yagi-uda Antenna .Also explain its general characteristics? (16)
3. Explain the construction, operation and design for a rhombic antenna ? (16)
4. Explain the geometry of a log periodic antenna? Give the design equations and uses of log periodic antenna ? (16)
5. Discuss in details about?(a)Self impedance(b)Mutual impedance ? (8)