Question

If the antenna dimension is two times the wavelength of the signal then the First null beam width will be _____

(a) 35

(b) 140

(c) 70

(d) 280

This question was posed to me during an online interview.

I'd like to ask this question from Aperture Antenna in section Aperture Antenna of Antennas

Answer 1

The correct choice is (c) 70

The best I can explain: The first null beam-width is given by 140λ/D.

⇨ \(\frac{140\lambda}{D} = \frac{140}{2}=70.\)