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What is a standard gain horn used for?

  • A.Measuring the polarisation purity of a circularly polarised antenna
  • B.Calibrating the frequency response of a spectrum analyser input
  • C.Providing a known gain against which other antennas are compared
  • D.Illuminating a compact range reflector to form the plane wave

Answer: C

Its gain can be computed accurately from its dimensions and verified by the three antenna method, which makes it the working standard for gain transfer measurements. Feeds, polarisation sources and instrument calibration are separate roles, though a horn may be pressed into any of them. Predictability rather than performance is what qualifies an antenna as a standard, and the pyramidal horn is predictable because its aperture field follows from the waveguide mode.

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