利用矩量法，首先导出了多端口耦合问题的关于传输模和截止模的等效导纳矩阵的计算公式。
Firstly, a general formulation for equivalent admittance matrix relating propagating modes and cutoff modes to each other is derived by the method of moments for the multi-port coupling problems.
对于短路板融入法，采用镜像原理导出了短路板产生的TE2 0模对相邻辐射裂缝导纳影响的解析表达式。
Using imaging principle an analytical expression of conductance of the slot is derived with the effect of TE20 mode of the adjacent short board for including method.
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