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← ScienceWhich electromagnetic radiation consequence occurs when a waveguide width is below resonance?
A)Wave Impedance transformation occurs
B)Evanescent mode power leakage
C)Waveguide characteristic impedance reduces
D)Propagation constant becomes imaginary✓
💡 Explanation
An electromagnetic wave cannot propagate because frequencies below the cutoff result in **Total Internal Reflection** inside guide. Therefore, the propagation constant is imaginary, rather than being real, because there is an exponential decay representing a non-propagating mode.
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