1
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
2
GATE ECE 1996
MCQ (Single Correct Answer)
+2
-0.6
A 1 km long microwave link uses two antennas each having 30dB gain. If the power transmitted by one antenna is 1 W at 3 GHz, the power received by the other antenna is approximately
A
98.6 $$\mu $$ W
B
76.8 $$\mu $$ W
C
63.4 $$\mu $$ W
D
55.2 $$\mu $$ W
3
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
4
GATE ECE 1992
MCQ (Single Correct Answer)
+2
-0.6
The beam width-between-first-null of a uniform linear array of N equally-spaced (element spacing = d) equally-excited antennas is determined by
A
N alone and not by d
B
d alone and not by N
C
the ratio (N/d)
D
the product (Nd)
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