1
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.
2
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
3
GATE ECE 1990
MCQ (Single Correct Answer)
+2
-0.6
Two isotropic antennas are separated by a distance of two wavelengths. If both the antennas are fed with currents of equal phase and magnitude, the number of lobes in the radiation pattern in the horizontal plane are
A
2
B
4
C
6
D
8
4
GATE ECE 1989
MCQ (Single Correct Answer)
+2
-0.6
In the case of ground wave propagation, at far-off distances from the transmitting tower antenna, the Poynting vector is
A
in the truly horizontal direction
B
essentially horizontal but for a small downward component
C
essentially horizontal but for a small upward component
D
directed upward at an angle determined by the "effective height" of the transmitting tower antenna.
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