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For an infinite transmission line, the characteristic impedance is given by 50 ohm. Find the input impedance.

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For an infinite transmission line, the characteristic impedance is given by 50 ohm. Find the input impedance.

(a) 25

(b) 100

(c) 2500

(d) 50

The question was asked in an online interview.

My doubt is from Transmission Line Equations in division Transmission Lines of Electromagnetic Theory

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Right option is (d) 50

Explanation: From the transmission line equation, the infinite line will have an input impedance same as that of the characteristic impedance. Thus Zin = Zo for l->∞. This shows that the line will be matched. The input impedance for the given case is 50 ohm.

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