谐振腔一端为平面反射镜，一端为金属栅网。
利用等效原理和矩量法导出了由半空间中平面波在主谐振腔中激励的等效磁流的表达式；
The equivalence principle and moment method are used to derive the expression of equivalent magnetic current in the main cavity excited by the plane wave in the half-space.
本文应用一般型谐振腔的变分方程，推导了平面型谐振腔谐振频率的特征方程。
The variational equation for general resonant cavities is used to derive the characteristic formula for the resonant frequency of the arbitrarily planar reso aators.
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