Question

The return loss is given as 12 decibel. Calculate the reflection coefficient.

(a) 0.35

(b) 0.55

(c) 0.25

(d) 0.75

The question was asked in an interview for internship.

My enquiry is from Power, Power Loss and Return Loss in division EM Wave Propagation of Electromagnetic Theory

Answer 1

Right choice is (c) 0.25

For explanation I would say: The return loss is given by RL = -20log R. The reflection coefficient can be calculated as R = 10^(-RL/20), by anti logarithm property. For the given return loss RL = 12, we get R = 10^(-12/20) = 0.25.