GATE EC 1992 Electromagnetics Solution Q 3

GATE EC 1992 Electromagnetics Solution Q 3

The beamwidth between first nulls of a uniform linear array of N equally spaced (element spacing = d), equally excited antennas, is determine by_____.

(a) N alone and not by d

(b) d alone and not by N

(c) the ratio, (N/d)

(d) the product, (Nd)

Ans :- (d)

Explanation

For Broadside Array

BWFN=\frac{2\pi}{Nd}

End fire array

BWFN=\frac43\sqrt{\frac{2\lambda}{Nd}}

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