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The best transmission length for effective transmission of power is(a) L = λ/4(b) L = λ/8(c) L = λ/2(d) L = ∞This question was addressed to me by my school principal while I was bunking the class.This intriguing question comes from Transmission Line Equations in portion Transmission Lines of Electromagnetic Theory

Answer»

Correct OPTION is (B) L = λ/8

Best EXPLANATION: Maximum TRANSMISSION of power will occur, when the transmission line is matched. This implies that the input and CHARACTERISTIC impedances are the same. This condition is possible for l = λ/8 and l = ∞. Since l = ∞ is not feasible, the best option is l = λ/8.



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