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What is the three antenna method used for?

  • A.Measuring the pattern of an antenna in three principal planes at once
  • B.Comparing three antennas to select the best performing of the group
  • C.Establishing the far field distance experimentally rather than by formula
  • D.Determining absolute gain without a calibrated reference antenna

Answer: D

Measuring the transmission between each of the three possible pairs gives three equations from which all three antenna gains follow, with no calibrated standard needed. It is the route by which a primary gain standard is established in the first place. Pattern measurement, selection testing and range validation are all different procedures. A measurement scheme that bootstraps absolute values out of relative ones is an elegant and widely reused idea.

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