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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 1The 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»

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.


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