Question

Which of the following statement is true?

(a) Standing waves occur when mismatches occurs

(b) Standing waves occur when no mismatches occurs

(c) Minimum value of SWR is 0

(d) Maximum value of SWR is 1

The question was asked by my college director while I was bunking the class.

I would like to ask this question from Standing Wave Ratio Method in chapter Modern Antennas & Antenna Measurements of Antennas

Answer 1

Correct answer is (a) Standing waves occur when mismatches occurs

Explanation: When there is mismatch, reflections occur and this causes for the occurrence of the standing waves. The standing wave ratio is defined as the maximum voltage to minimum voltage.

\(S=\frac{V_{max}}{V_{min}} =\frac{1+ρ}{1-ρ}\) And reflection coefficient \(ρ=\frac{P_{ref}}{P_{inc}}. \) Therefore S ranges from 1 to infinity.