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What is the effective length of a short dipole compared with its physical length?

  • A.About half of it
  • B.Equal to it
  • C.About twice it
  • D.About a quarter of it

Answer: A

Because the current tapers from a maximum at the feed to zero at each end, the average is half the peak and the effective length is half the physical length. For a half wave dipole the sinusoidal distribution gives an effective length of lambda over pi, about 0.32 wavelengths against a physical 0.5. The quantity matters because it converts an incident field strength into a terminal voltage, which is the basis of every field strength measurement that is ever made.

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