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The reflection coefficient of a transmission line having characteristic and load impedances as 50 and 30 ohm respectively is(a) 1/4(b) 1/8(c) 1/2(d) 3/4This question was posed to me by my school teacher while I was bunking the class.Question is taken from Reflection and Transmission Coefficients topic in chapter Transmission Lines of Electromagnetic Theory

Answer»

Correct ANSWER is (a) 1/4

The EXPLANATION: The reflection coefficient of a transmission line is givenby, R = ZL – ZO/ZL + Zo, where ZL and Zo is the load and characteristic impedances RESPECTIVELY. On SUBSTITUTING ZL = 30 and Zo = 50, the reflection coefficient R = 50 – 30/50 + 30 = 20/80 = 1/4.



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