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Anna University
ANTENNAS AND WAVE PROPAGATION
QUESTION BANK
SUB. CODE/ NAME: EC
2353/ANTENNAS AND WAVE PROPAGATION BRANCH : ECE
YEAR : III
SEM : VI
UNIT I
ELECTROMAGNETIC
RADIATION AND ANTENNA FUNDAMENTALS
PART- A (2 MARK)
1. Define an antenna.
2. What is meant by
radiation pattern?
3. Define Radiation
intensity?
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 are the field
zones?
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.
PART– B (16 MARK)
1. Explain the
retarded vector potential in detail. (16 M)
2. Derive an
expression for the power radiated by the current element and calculate the
radiation resistance. (16 M)
3. Derive an
expression for the far field component of a half wave dipole of an antenna.
(16M)
4. a) Derive the total
power radiated by half wave dipole. (8 M)
b) Show that the
radiation resistance of a half wave dipole is 80?2 (dl/?)2Ohms. (8 M)
5. Explain the
reciprocity theorem in detail. (16 M)
6. Derive an
expression for the electric field and magnetic field due to a current element
at a distance point in free space. (16 M)
7. a) Derive an
expression for the gain of half wave dipole. (8 M)
b) Explain effective
aperture area with its types in detail. (8 M)
8. At what distance is
the radiation component of magnetic field twice the inductance component? At
what distance is it 100 times. (16 M)
UNIT II
WIRE ANTENNAS AND
ANTENNA ARRAYS
PART – A (2 MARK)
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. State Poynting
theorem.
26. What is point
source?
27. What is meant by
array?
28. What is meant by
uniform linear array?
29. 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 parasitic
array?
36. Define beam width
of major lobe?
37. List out the
expression of beam width for broad side array and end fire array.
38. Differentiate
broad side and End fire array?
39. What is the need
for the Binomial array?
40. Define power
pattern?
PART- B (16 MARK)
1. Write short notes
on various forms of arrays
i. Broad side array
ii. End fire array ii. Collinear array iv. Parasitic array(4 M each)
2. Derive the
expression for the far field pattern of an array of 2 – isotropic point sources
i) Equal amplitude and phase ii) Equal amplitude and opposite phase(4 M each)
iii) Unequal amplitude
and any phase(8 M)
3. Explain the principle
of Pattern multiplication. (16 M)
4. Explain the array
of N- sources of equal amplitude and spacing- Broad side case i. Direction of
pattern maxima ii. Direction of pattern minima (4 M each)
iii. Beam width of
major lobe (8 M)
5. Explain the array
of N- sources of equal amplitude and spacing- End fire case i) Direction of
pattern maxima ii. Direction of pattern minima (4 M each)
iii. Beam width of
major lobe (8 M)
6. Write short notes
on. i. Binomial arrays ii. Phased arrays (8 M each)
U
NIT III
APERTURE ANTENNAS
PART – A (2 MARK)
41. What is meant by
similar Point sources?
42. What is meant by
identical Point sources?
43. What is the
principle of the pattern multiplication?
44. What is the
advantage of pattern multiplication?
45. What is tapering
of arrays?
46. What is a binomial
array?
47. What are the
advantages of binomial array?
48. What is the
difference between isotropic and non isotropic source?
49. Define Side Lobe
Ratio.
50. List the arrays
used for array tapering?
51. What is a Short
Dipole?
52. How radiations are
created from a short Dipole?
53. Why a short dipole
is also called an elemental dipole?
54. What is a
Infinitesimal Dipole?
55. Why a short dipole
is called a oscillating dipole?
56. What do you
understand by retarded current?
57. Define induction
field.
58. Define Radiation
field.
59. At what distance
from the dipole is the induction field equal to the radiation field?
60. Define Radiation
Resistance.
PART – B (16 MARK)
1. Explain the
different types of lens antenna? (16 M)
2. Explain the
radiation from a rectangular aperture? (16 M)
3. Explain the
radiation from an elemental area of a plane wave
(or) explain the
radiation from a Huygen's source ? (16 M)
4. Describe the
parabolic reflector used at micro frequencies? (16 M)
5. Write short notes
on luneberg lens? (16 M)
6. Discuss about
spherical waves and biconical antenna? (16 M)
7. Derive the various
field components radiated from circular aperture and also find
beamwidth and
effective area? (12 M)
8. Derive the field
components radiated from a thin slot antenna in an infinite cylinder? (8)
UNIT IV
SPECIAL ANTENNAS AND
ANTENNA MEASUREMENTS
PART- A (2 MARK)
61. What is a dipole
antenna?
62. What is a half
wave dipole?
63. What is the
radiation resistance of a half wave dipole?
64. What is a loop
antenna?
65. Give an expression
of radiation resistance of a small loop
66. How to increase
the radiation resistance of a loop antenna?
67. What are
Electrically Small loop antennas?
68. What are
electrically large loop antennas?
69. List out the uses
of loop antenna?
70. What are the
parameters to be considered for the design of a helical antenna?
71. What are the types
of radiation modes of operation for an helical antenna?
72. Which antenna will
produce circularly polarized waves?
75. List the
applications of helical antenna?
PART – B (16 MARK)
1. Explain the
principle of traveling wave radiator. (16 M)
2. Derive an
expression for the radiated field due to a TWA. (16 M)
3. Obtain the
expression for the field produced by TWA and compare its radiation with
resonant antenna. (16 M)
4. Obtain the
expression for the emf due to loop antenna and explain its use as a Direction
finder. (16 M)
5. Explain the special
features of various types of Horn antennas and frequency independent antennas.
(16 M)
6. With a suitable
diagram, discuss the construction and operation of a Yagi antenna. (16 )
7. Write detailed
notes on (a) Parabolic reflectors (b) Log Periodic antennas (8 M each)
8. (a) Explain the
principle of operation and applications of folded dipoles.
(b) With a suitable
diagram explain the construction and principle of operation of a log –
periodic antenna. (8 M
each)
9. Write short notes
on (a) Slot radiators (b) Loop antennas (8 M each)
10. How does a log
periodic antenna provide a large bandwidth of operation? (16 M)
11. Explain the
principle of operation and applications of loop antenna. (16 M)
12. Write detailed
notes on (a) Horn antennas (b) Frequency independent antennas. (8)
13. Explain the
principle of operation and applications of loop antenna. (16 M)
14. Explain in detail
the working principle of Helical antenna in
(a) Normal mode (b)
Axial mode (8 M each)
76. Define Sky wave.
U
NIT V
RADIO WAVE PROPAGATION
PART – A (2 MARK)
77. Define Troposphere
wave.
78. Define Ground
wave.
79. What are the types
of Ground waves?
81. What is meant by
Space Wave?
82. What is meant by
Surface Wave?
83. What is meant by
fading?
84. What are the types
of fading?
85. What are inverse
and multi path fading?
86. What is meant by
diversity reception?
87. Define Space
diversity Reception.
88. Define frequency
diversity Reception.
89. Define
polarization diversity reception.
90. What is meant by Faraday's
rotation?
91. What are the
factors that affect the propagation of radio waves?
92. Define gyro
frequency.
93. Define critical
frequency.
94. Define
Magneto-Ions Splitting.
95. Define LUHF.
96. Define Refractive
index.
97. Define maximum
Usable Frequency.
98. Define skip
distance.
99. Define Optimum
frequency?
100. Define wave
velocity and Group velocity?
PART – B (16 MARK)
1. Explain briefly the
various modes of Propagation (16 M)
2. Explain Ground Wave
Propagation in detail (16 M)
3. Explain the
Structure of Atmosphere (16 M)
4. Explain the various
layers of Ionosphere (16 M)
5. Explain the effect
of Earth's Magnetic Field on Radio wave Propagation (16 M)
6. Explain Virtual
Height and derive its Expression (16 M)
7. Explain Maximum Usable
Frequency and show how to Calculate MUF (16 M)
8. Explain (a) Skip
Distance (b) Optimum Working Frequency (8 M each)
9. Explain briefly
about Ionospheric abnormalities (16 M)
10. Determine the
Effective Earth's Radius in Space Wave Propagation (16 M)
11. Explain Super
Refraction. (16 M)
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