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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) 150This 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

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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