Question

What is the phase excitation difference for a broadside array?

(a) 0

(b) π/2

(c) π

(d) 3π/2

This question was addressed to me in exam.

I would like to ask this question from Broadside Array topic in division Antenna Array of Antennas

Answer 1

The correct choice is (a) 0

For explanation I would say: The maximum array factor occurs when \(\frac{sin \frac{Nφ}{2}}{\frac{Nφ}{2}}\) maximum that is  \(\frac{Nφ}{2}=0.\)

And φ=kdcosθ+β

=> kdcosθ+β=0 For a broadside maximum radiation is normal to axis of array so θ=90

=> β=0