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Which consequence results when a dielectric of limited thickness limits wave propagation within a parallel-plate waveguide?

A)Cutoff frequency increases substantially
B)Characteristic impedance approaches zero
C)Reflections increase within operating band
D)Spurious modes are effectively suppressed

💡 Explanation

Increased reflections occur because impedance mismatch arises from boundary conditions imposed during wave propagation via the Fresnel equations. Therefore, impedance is impacted, rather than cutoff which depends on waveguide geometry, and spurious modes can be excited instead if conditions permit alternative pathways.

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