1
GATE ECE 2008
MCQ (Single Correct Answer)
+2
-0.6
At 20 GHz, the gain of a parabolic dish antenna of 1 meter diameter and 70% efficiency is
A
15 dB
B
25 dB
C
35 dB
D
45 dB
2
GATE ECE 2007
MCQ (Single Correct Answer)
+2
-0.6
A $$\lambda /2$$ dipole is kept horizontally at a height of $${\lambda _0}/2$$ above a perfectly conducting infinite ground plane. The radiation pattern in the plane of the dipole ($$\overrightarrow E $$ plane) looks approximately as
A
GATE ECE 2007 Electromagnetics - Antennas Question 35 English Option 1
B
GATE ECE 2007 Electromagnetics - Antennas Question 35 English Option 2
C
GATE ECE 2007 Electromagnetics - Antennas Question 35 English Option 3
D
GATE ECE 2007 Electromagnetics - Antennas Question 35 English Option 4
3
GATE ECE 2006
MCQ (Single Correct Answer)
+2
-0.6
A mast antenna consisting of a 50 meter long vertical conductor operates over a perfectly conducting ground plane. It is base-fed at frequency of 600 kHz. The radiation resistance of the antenna in ohms is
A
$${{2\,\,{\pi ^2}} \over 5}$$
B
$${{\,\,{\pi ^2}} \over 5}$$
C
$${{4\,\,{\pi ^2}} \over 5}$$
D
$$20\,\,\,{\pi ^2}$$
4
GATE ECE 2005
MCQ (Single Correct Answer)
+2
-0.6
Two identical and parallel dipole antennas are kept apart by a distance $$\lambda /4$$ of in the H-plane. They are fed with equal currents but the right most antenna has a phase shift of +90°. The radiation pattern is given as
A
GATE ECE 2005 Electromagnetics - Antennas Question 37 English Option 1
B
GATE ECE 2005 Electromagnetics - Antennas Question 37 English Option 2
C
GATE ECE 2005 Electromagnetics - Antennas Question 37 English Option 3
D
GATE ECE 2005 Electromagnetics - Antennas Question 37 English Option 4
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