Question

What happens when a vertical or horizontal polarized antenna receives a circular polarized wave?

(a) Gain increases

(b) Signal strength increases

(c) Signal strength reduces

(d) Cannot receive circular polarized waves

I got this question in exam.

This key question is from Antenna Fundamentals in portion Antennas and Wave Propagation of Avionics

Answer 1

The correct option is (c) Signal strength reduces

Explanation: A vertical or horizontal antenna can receive circular polarized signals, but the signal strength is reduced. When circular polarization is used at both transmitter and receiver, both must use either left- or right-hand polarization if the signal is to be received.