Question

If physical aperture of antenna is 0.02m^2 and aperture efficiency is 0.5, then what is the value of effective aperture?

(a) 0.0004m^2

(b) 0.001m^2

(c) 0.01m^2

(d) 25m^2

This question was posed to me during an interview.

My question comes from Effective Aperture in chapter Antenna Parameters of Antennas

Answer 1

The correct option is (c) 0.01m^2

To explain I would say: Effective aperture Aem=Aeη=0.02×0.5=0.01 m^2