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An example for lossless propagation is

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An example for lossless propagation is

(a) Dielectric waveguide propagation

(b) Conductor propagation

(c) Cavity resonator propagation

(d) It is not possible

This question was posed to me during an online interview.

This interesting question is from Lossy and Lossless Dielectrics topic in chapter EM Wave Propagation of Electromagnetic Theory

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The correct option is (d) It is not possible

To elaborate: There are many techniques employed to achieve zero attenuation or maximum propagation. But it is not achievable practically. Thus lossless propagation is not possible practically.

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