GATE EC 1997 Electromagnetics Solution Q 3

GATE EC 1997 Electromagnetics Solution Q 3

A parabolic dish antenna has conical beam 2^o wide. The directivity of the antenna is approximately_____.

(a) 20 dB

(b) 30 dB

(c) 40 dB

(d) 50 dB

Ans :- (c)

Explanation

For an antenna with a conical (or approximately conical) beam with a half-power beamwidth of θ degrees,

D=\frac2{1-\cos\;\left(\theta/2\right)}

It would be approximately around 10,000 considering the options.

So, D = 40 dB

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