【摘要】 利用电磁场的等效原理 ,将一个开放微波腔等效于一个闭合边界微波腔 (即封闭微波腔 )和开放边界 (即行波吸收边界 )两部分 ,然后利用等效封闭微波腔的本征模式及其与开放边界的耦合 ,建立了关于开放微波腔模式 (即模式场分布、频率、品质因子 )的耦合方程组 ,其中开放边界为行波吸收边界 .以X波段六腔渡越振荡管为例进行分析 ,将该振荡管等效为封闭微波腔和同轴输出结构两部分 ,用SUPPERFISH获得封闭腔的各个模式场分布及频率 ,然后根据封闭微波腔与开放边界的耦合 ,求得六腔渡越振荡管的工作模频率为 9 2 5GHz ,品质因子为 115 2 ,与实验测量结果基本符合更多还原

【Abstract】 In the paper, an open cavity is divided into two parts: closed part and open part. The closed part means the closed cavity, and the open part is equivalent to the absorbing traveling boundary. According to Maxwell theory, there exists a coupling equation between the modes of the closed cavity and those of the open part. Utilizing the method, the X-band six-cavity transit time oscillator is calculated; the calculated frequency and the Q value of the working mode are very close to the measured values.更多还原