Electronics and Communication Engineering - Exam Questions Papers - Discussion

2. 

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

Answer: Option C

Explanation:

No answer description available for this question.

Jaswant Sing said: (Aug 20, 2016)  
Please explain the solution.

Santhosh said: (Apr 1, 2018)  
The gain of a parabolic dish antenna, G=η√2(Dλ)2=(0.7).√2(13*10820*109)2,

G=30705.
In dB, G=10logG=45dB.

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