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Which outcome results when a waveguide's dimensions approach zero?

A)Evanescent wave propagation is dominant
B)Higher order TE modes are favored
C)Radiative losses diminish significantly
D)Group velocity approaches speed of light

💡 Explanation

Evanescent wave propagation becomes dominant because below the cutoff frequency, the waveguide cannot support propagating modes therefore the electromagnetic field decays exponentially. It's evanescent propagation rather than radiative, because very thin dimension constrain modes.

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