1
GATE ECE 2000
MCQ (Single Correct Answer)
+2
-0.6
For an 8 feet (2.4 m) parabolic disk antenna operating at 4 GHz, the minimum distance required for far field measurement is closest to
A
7.5 cm
B
15 cm
C
15 m
D
150 m
2
GATE ECE 1999
MCQ (Single Correct Answer)
+2
-0.6
A transmitting antenna radiates 251 W isotropically. A receiving antenna, located 100m away from the transmitting antenna, has an effective aperture of 500 cm2. The total power received by the antenna is
A
10 nW
B
1 $$\mu $$ W
C
20 $$\mu $$ W
D
100 $$\mu $$ W
3
GATE ECE 1997
MCQ (Single Correct Answer)
+2
-0.6
A parabolic dish antenna has a conical beam 20 wide. The directivity of the antenna is approximately
A
20 dB
B
30 dB
C
40 dB
D
50 dB
4
GATE ECE 1996
MCQ (Single Correct Answer)
+2
-0.6
A transverse electromagnetic wave with circular polarization is received by a dipole antenna. Due to polarization mismatch, the power transfer efficiency from the wave to the antenna is reduced to about
A
50%
B
35.3%
C
25%
D
05
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