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← ScienceWhich consequence results when an antenna attempts to emit frequencies below waveguide cutoff?
A)Reactive power dominates feedpoint impedance✓
B)Radiation resistance increases substantially
C)Antenna gain improves unexpectedly
D)Spurious harmonic emission appears
💡 Explanation
Reactive power dominates because below cutoff frequency, the waveguide acts as a reactive element. The Evanescent wave appears and stores, rather than radiates, energy; therefore, impedance becomes reactive rather than primarily resistive. Harmonics are unrelated.
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