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In the far field of an antenna the Poynting vector is

  • A.essentially imaginary, representing stored energy
  • B.zero, no energy escaping the antenna
  • C.directed back toward the antenna
  • D.essentially real, representing radiated power

Answer: D

Close to the antenna the reactive component dominates and energy surges in and out each cycle; beyond a few wavelengths only the real radiating component survives. The boundary between the two regions is roughly where the measurement of a pattern becomes meaningful.

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