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A receiving antenna aligned at right angles to the polarisation of an incoming linearly polarised wave picks up

  • A.the whole of the available power
  • B.a signal reduced by three decibels
  • C.nothing, in the ideal case
  • D.half the available power

Answer: C

The field has no component along the antenna, so no voltage is induced. In practice cross-polar rejection of twenty or thirty decibels is achieved rather than perfect nulling, and that rejection is exploited to reuse a frequency on two polarisations.

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