Which effect increases when a microwave waveguide operates near its cutoff frequency?

💡 Explanation

When a waveguide nears cutoff frequency, wave propagation becomes impaired; the signal attenuates sharply because the dominant mode becomes evanescent, transitioning from propagating to non-propagating. Therefore, increased signal attenuation results, rather than power handling issues, group velocity changes, or impedance mismatches which involve different waveguide effects.

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