GATE EC 2000 Electromagnetics Solution Q 8

GATE EC 2000 Electromagnetics Solution Q 8

For an 8 feet (2.4 m) parabolic dish antenna operating at 4 GHz, the minimum distance required for far field measurement is closest to _.

(a) 7.5 cm

(b) 15 cm

(c) 15 m

(d) 150 m

Ans :- (d)

Explanation

d=\frac{2l^2}\lambda \lambda=\frac{3\times10^8}{4\times10^9}=7.5 d=\frac{2\times2.4\times2.4}{7.5}=1.536\;m

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