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The axial ratio of an elliptically polarised wave is

  • A.the ratio of the wavelength to the antenna dimension
  • B.the ratio of the major to the minor axis of the ellipse
  • C.the ratio of the electric to the magnetic field amplitude
  • D.the ratio of the phase to the group velocity

Answer: B

It is unity for circular polarisation and infinite for linear, so it measures how far a wave departs from the circular case. Antennas intended for satellite links are specified by it, since a mismatch in polarisation costs signal.

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