Question

Antenna’s efficiency is given by the ratio of __________

(a) Losses

(b) Physical aperture to effective aperture

(c) Signal power to noise power

(d) Effective aperture to physical aperture

I got this question by my college director while I was bunking the class.

The doubt is from Practical Link Budget Design Using Path Loss Models topic in portion Mobile Radio Propagation: Large – Scale Path Loss of Wireless/Mobile

Answer 1

Correct answer is (d) Effective aperture to physical aperture

To elaborate: The larger the antenna aperture the larger is the resulting signal power density in the desired direction. The ratio of effective aperture to the physical aperture is the antenna’s efficiency.