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Which risk increases when a dielectric's thickness decreases in capacitively coupled waveguide?

A)Wave propagation mode degradation
B)Increased waveguide bandwidth stability
C)Reduced capacitive coupling strength
D)Suppressed higher-order wave harmonics

💡 Explanation

Wave propagation mode degradation occurs, because a thinner dielectric heightens the effects of surface roughness, causing increased scattering via Rayleigh scattering; therefore, affects mode orthogonality and increases energy leakage, rather than beneficial stability or coupling effects.

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