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What would be the directivity of a linear broadside array in dB consisting 5 isotropic elements with element spacing λ/4?

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What would be the directivity of a linear broadside array in dB consisting 5 isotropic elements with element spacing λ/4?

(a) 9.37

(b) 3.97

(c) 6.53

(d) 3.79

I got this question in semester exam.

The query is from Broadside Array topic in chapter Antenna Array of Antennas

1 Answer

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Right answer is (b) 3.97

The best explanation: Directivity \(D=\frac{2Nd}{λ}=\frac{2×5×\frac{λ}{4}}{λ}=2.5\)

D (dB) = 10log2.5=3.97 dB

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