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The exciter of the waveguide in a transmission line is the

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The exciter of the waveguide in a transmission line is the

(a) Transmitter

(b) Receiver

(c) Transponder

(d) Antenna

This question was addressed to me at a job interview.

My question is taken from Transients topic in portion Waveguides of Electromagnetic Theory

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Right answer is (d) Antenna

To elaborate: The waveguide is usually excited by the antenna rod. The reflection depends on the phase of excitation and the antenna current.

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