1
GATE ECE 2014 Set 4
Numerical
+1
-0
For an antenna radiating in free space, the electric field at a distance of 1 km is found to be 12 m V/m. Given that intrinsic impedance of the free space is 120$$\pi \Omega$$, the magnitude of average power density due to this antenna at a ditance of 2 km from the antenna (in n W/$${m^2}$$) is
2
GATE ECE 2014 Set 4
+1
-0.3
Match column A with column B.

Column
1. Point electromagnetic source
2. Dish antenna
3. Yagi-Uda antenna

Column
P. Highly directional
Q. End fire
R. Isotropic

A
1 = P, 2 = Q, 3 = R
B
1 = R, 2 = P, 3 = Q
C
1 = Q, 2 = P, 3 = R
D
1 = R, 2 = Q, 3 = P
3
GATE ECE 2012
+1
-0.3
The radiation pattern of an antenna in spherical co-ordinates is given by $$F\,(\theta )\, = {\cos ^4}\,\theta \,\,\,;\,\,0\,\, \le \,\,\theta \,\, \le \,\,\pi /2$$\$ The directivity of the antenna is
A
10 dB
B
12.6 dB
C
11.5 dB
D
18 dB
4
GATE ECE 2008
+1
-0.3
For a Hertz dipole antenna, the half power beam width (HPBW) in the E-plane is
A
$${360^ \circ }$$
B
$${180^ \circ }$$
C
$${90^ \circ }$$
D
$${45^ \circ }$$
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