Which effect typically occurs when a microwave signal encounters a narrow waveguide below its cutoff frequency?

💡 Explanation

When a waveguide operates below its cutoff frequency, the mode becomes evanescent, which means no true propagation occurs because energy is stored rather than transmitted, causing the signal to attenuate exponentially. Therefore, exponential attenuation occurs, rather than propagation, resonance, or harmonic generation which require frequencies above cutoff.

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