In a broadside array of 20 isotropic radiators, equally

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In a broadside array of 20 isotropic radiators, equally spaced at distance of λ/2, the beamwidth of the first nulls is—

1. 11.46º
2. 5.73º
3. 10.46º
4. None of these

Correct Option: A

For broad side array beamwidth of first null is given by

2θ = beamwidth = 2 sin^–1		λ
		ηd

where, η = no. of radiators
d = spacing between the radiators
so,

2θ = 2 sin^–1	λ			= 2sin^-1		1
		20 .	λ			10
			2

= 2 × 5.73 = 11.46°