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Reg No.:_ Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SIXTH SEMESTER B.TECH DEGREE EXAMINATION(R&S), MAY 2019

Course Code: EC306
Course Name: Antenna & Wave Propagation

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks Marks
1 a) Define beam solid angle and directivity of an antenna 9
b) Draw the equivalent circuit of a receiver antenna 6
2 a) Derive expression for far field pattern of a half wave dipole antenna and find 10

position of Nulls and BWEN.

b) Explain any one method of gain measurement of an antenna 5
3 ௨ A transmitter antenna transmits 101/2! power at 1001/17 with efficiency 80%.
The gain of the transmitter antenna is 3. The receiver antenna is ೩! ೩ distance 51൩ 8
from transmitter which is identical to transmitter. The effective length of receiver
antenna is 0.34 .Calculate
a) The power density at the receiver antenna
b) Electric field intensity at the receiver antenna.
c) The power received by the receiver antenna.
d) The voltage induced at the input terminal of the antenna

b Explain the concept of retarded potential 7

4 Plot the radiation pattern of a 4 element linear broadside array with isotropic point 15

sources with spacing d -4 . Find BWEN of the array,

5 a) With necessary equations explain the principle of beam steering 10
b) Explain binomial array 5
6 a) Explain the working of a rhombic antenna 10
b) Explain the principle of pattern multiplication 5

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