采用等效馈源及凿孔表面的反射与传输系数导出了部分为凿孔表面的反射器天线等效反射系数及天线噪声温度的计算公式。计算表明对于部分为网状表面（25m直径以外）的40m天线，只要孔的直径（圆孔）或边长（方孔）约为十分之一波长，即使部分网面的孔积率达到70％，反射面等效反射系数近似于1，而引入的附加噪温约为零K。

The calculation formula of the equivalent reflection coefficient and noise temperature of reflector antenna with the partially perforated surface are derived by the reflection and transmission coefficients and the equivalent feed. The calculation shows that only the hole diameter of circular hole or the length of side of square hole is about one ten of wave-length for 40 m antenna with partial mesh surface (except the antenna with diameter of 25 m), even the porosity of the mesh surface is 70%, the equivalent reflection coefficient of the reflector surface is approximate to 1 and the introduced additional noise temperature is about zero rise.

TN820