Question

Condition for the half power width of the Array factor is given by ___________

(a) \(\frac{Nᴪ}{2}=±1.391 \)

(b) \(\frac{Nᴪ}{2}=±3\)

(c) \(\frac{Nᴪ}{2}=±0.5\)

(d) \(\frac{Nᴪ}{2}=±1\)

The question was asked in a job interview.

This intriguing question comes from N-element Linear Array in portion Antenna Array of Antennas

Answer 1

Correct option is (a) \(\frac{Nᴪ}{2}=±1.391 \)

The best I can explain: Array factor is the function of antenna positions in the array and its weights. Half power beamwidth is also known as the 3 decibel points. The half power beam widths of the array factor will occur at \(\frac{Nᴪ}{2}=±1.391. \)