Gain is four pi times the ratio of an antenna’s radiation intensity in a given direction to the total power accepted by the antenna.
Realized gain is four pi times the ratio of an antenna’s radiation intensity in a given direction to the total power incident upon the antenna port(s)
Gain 不考虑端口驻波影响
Realized gain考虑端口驻波影响
HFSS里面，对于GAIN，是用4*pi*U/Pacc，Pacc字面上理解就是端口从激励源接受的功率，而realized gain用的是Pincident，就是全部的入射功率，当端口共轭匹配的时候，Pacc就等于Pincident,实际不可能做到完全匹配，所以Pincident始终是大于Pacc的，所以，看方向图的时候，realized gain比gain小。
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