Question

Consider a transmission line of characteristic impedance 50 ohm. Let it be terminated at one end by +j50 ohm. The VSWR produced by it in the transmission line will be

(a) 1

(b) 0

(c) Infinity

(d) +j

I had been asked this question during an interview for a job.

Query is from Advanced and Tricky Questions in portion Advanced and Tricky Questions of Electromagnetic Theory

Answer 1

The correct option is (c) Infinity

Explanation: The reflection coefficient is given by R = j50 – 50/j50 + 50 = j – 1/j + 1. Thus the reflection coefficient is given by 1. The VSWR = 1 + R/1 – R = 2/0 = infinity.