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← ScienceWhich consequence results when the Fraunhofer distance is exceeded during microwave antenna radiation?
A)Far-field power density approximations fail✓
B)Wave impedance collapses catastrophically occurs
C)Near-field standing waves dominate propagation
D)Antenna gain experiences total unexpected reversal
💡 Explanation
When exceeding the Fraunhofer distance, far-field approximations are invalid because field behavior diverges from idealized models rather than impedance collapse. This changes the wave characteristic because Fresnel diffraction effects dominate; therefore, power density calculations become less accurate rather than other catastrophic failures.
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