Question

Find the overall length of an end-fire array with 10 elements and spacing λ/4.

(a) \(\frac{9λ}{4}\)

(b) \(\frac{5λ}{4}\)

(c) \(\frac{5λ}{2}\)

(d) \(\frac{9λ}{2}\)

This question was posed to me in an online interview.

Asked question is from End Fire Array topic in chapter Antenna Array of Antennas

Answer 1

The correct answer is (a) \(\frac{9λ}{4}\)

The explanation: For an N-element end-fire array, the overall length of the array is given by ρ=(N-1)d

⇨ ρ=(N-1)d=(10-1)(λ/4)=9 λ/4