- Absolute gain (physics)
The absolute gain of an antenna, for a given direction and
polarization, is the ratio of (a) the power that would be required at the inputof an ideal isotropic radiatorto (b) the power actually supplied to the given antenna, to produce the same radiant intensityin the far-field region.
If no direction is given, the absolute
gainof an antenna corresponds to the direction of maximum effective radiated power. Absolute gain is usually expressed in dB.
Examples of absolute gain are no-
loadgain, full-load gain, and small-signal gain.
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