1
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
2
GATE ECE 1992
MCQ (Single Correct Answer)
+2
-0.6
Two dissimilar antennas having their maximum directivities equal
A
must have their beamwidths also equal
B
cannot have their beamwidths equal because they are dissimilar antennas
C
may not necessarily have their maximum power gains equal
D
must have their effective aperture areas (capture areas) also equal.
3
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)
4
GATE ECE 1991
MCQ (Single Correct Answer)
+2
-0.6
In a board side array of 20 isotropic radiators, equally spaced at a distance of $$\lambda /2$$, the veam width between first nulls is
A
51.3 degrees
B
11.46 degrees
C
22.9 degrees
D
102.6 degrees
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