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← TechnologyWhich risk increases when a microwave antenna corrodes?
A)Reflected power at feedpoint rises✓
B)Bandwidth of radiated signal decreases
C)Antenna gain characteristics improve
D)Polarization becomes increasingly circular
💡 Explanation
Antenna corrosion increases surface resistance, causing impedance mismatch because the **skin effect** dictates conductivity concentrates in the outer layers; therefore, more power reflects back, rather than radiating efficiently, and bandwidth characteristics are unaffected.
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