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The minimum impedance of a transmission line 75 ohm with a standing wave ratio of 4 is

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The minimum impedance of a transmission line 75 ohm with a standing wave ratio of 4 is

(a) 75

(b) 300

(c) 18.75

(d) 150

This question was addressed to me during an interview for a job.

Enquiry is from Input and Characteristic Impedances topic in chapter Transmission Lines of Electromagnetic Theory

1 Answer

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Best answer
Right choice is (c) 18.75

For explanation: The minimum impedance of a line is given by Zmin = Zo/S. On substituting for Zo = 75 and S = 4, we get Zmin = 75/4 = 18.75 units.

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