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The input impedance of a quarter wave line 50 ohm and load impedance of 20 ohm is(a) 50(b) 20(c) 1000(d) 125The question was asked during an online exam.This is a very interesting question from Input and Characteristic Impedances in portion Transmission Lines of Electromagnetic Theory |
Answer» RIGHT option is (d) 125 Easiest EXPLANATION: The characteristic impedance will be the geometric MEAN of the INPUT impedance and the load impedance. Thus Zo^2 = Zin ZL. On substituting for Zo = 50 and ZL = 20, we get the input impedance as 50^2/20 = 125 ohm. |
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