Question

Which of the following is the correct condition of an ordinary end-fire array?

(a) β=±kd

(b) β=kd

(c) β > kd

(d) β < ±kd

This question was posed to me during an online exam.

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

Answer 1

The correct option is (a) β=±kd

Easy explanation: For an end-fire array maximum radiation is along the axis of array so

 θ=0° or 180°

=> β=kd when θ=180°

=> β=-kd when θ=0°