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Which type of transmission line accepts the TEM wave?

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Which type of transmission line accepts the TEM wave?

(a) Copper cables

(b) Coaxial cable

(c) Rectangular waveguides

(d) Circular waveguides

I have been asked this question at a job interview.

This is a very interesting question from Transverse Electric Magnetic Waves(TEM) in chapter Waveguides of Electromagnetic Theory

1 Answer

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Right option is (b) Coaxial cable

Explanation: Hollow transmission lines support TE and TM waves only. The TEM wave is possible only in the coaxial cable transmission line, which is not hollow.

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