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Antenna & Wave PropagationBeamwidth

At a half-power point, the field magnitude relative to its maximum is approximately?

  • A0.5
  • B0.707
  • C1.414
  • D2
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Correct Answer: B. 0.707
Explanation: Power is proportional to field magnitude squared, so half power corresponds to field magnitude 1/sqrt(2)≈0.707 of maximum.
Reference: Standard antenna and wave propagation: beamwidth
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