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An antenna's efficiency is the ratio of

  • A.its gain to its directivity, expressed as a percentage
  • B.its effective aperture to its physical aperture
  • C.its radiation resistance to the sum of the radiation and loss resistances
  • D.its radiation resistance to its loss resistance

Answer: C

The input power divides between the two resistances in proportion to their values, so the fraction radiated is that ratio. The ratio of gain to directivity is numerically the same quantity, which is why the two definitions are sometimes confused.

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