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When the length of the transmission line is same as that of the wavelength, then which condition holds good?

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in Electromagnetic Theory by (188k points)
When the length of the transmission line is same as that of the wavelength, then which condition holds good?

(a) Zin = Zo

(b) Z = Zo

(c) ZL = Zo

(d) Zin = ZL

The question was posed to me in an interview for job.

My query is from Transmission Line Equations in chapter Transmission Lines of Electromagnetic Theory

1 Answer

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Best answer
Correct option is (d) Zin = ZL

Explanation: When the transmission line has a length same as that of the wavelength of the wave propagating through it, the input impedance will be same as the load impedance. This is the case where the wave is not amplified. The transmission line acts as a buffer.

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