Aperture Efficiency
This is applied to aperture antennas such as a parabolic antenna and is a measure of the reduction in power gain caused by non-uniform aperture illumination. In a typical situation the reflector is illuminated with a reduced power-density at the edge compared with the centre, in order to reduce sidelobes and other effects. This causes a reduction in gain: the ratio of the gain of the tapered aperture distribution to the theoretical gain of a uniformly illuminated aperture is the aperture efficiency.
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