计算波导加载谐振腔谐振频率的新方法

基于边界元法, 提出了一种新的简单有效的计算速调管输出系统波导加载腔的谐振频率、场分布的方法。计算了一种矩形波导加载矩形谐振腔的常见结构。利用主模TE10波激励, 在波导的端口处采用推导出的Ｒobin-type边界条件, 通过扫频的方式, 观测选定场点的值, 极值对应系统的谐振频率。数值结果表明:波导加载谐振腔的谐振频率要低于同尺寸谐振腔的频率, 谐振腔内的电场分布也受到耦合孔的影响。利用边界元法计算波导加载腔这样的半开放系统, 具有实现简单、计算精确度高、数据输入少、计算时间短等优点。

Abstract

A simple and effective method based on boundary element method, is proposed for computer determination of the resonant frequency and field distribution of the waveguide-loaded cavity in klystron output system. This paper calculates a common rectangular-waveguide-loaded rectangular cavity. The TE10 mode wave is used as the input wave, and the Robin-type boundary condition is used in the output waveport. The maximum of the electric field is searched, which corresponds to the eigenfrequency. The obtained eigenfrequency is lower than that of the cavity of the same size and loaded with no waveguide, and the field distribution is under the influence of coupling hole. It is shown that this method needs less computing time and resources in solving the half-open system like a waveguide-loaded cavity with high precision.

参考文献

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李纪三, 王勇, 刘文鑫. 计算波导加载谐振腔谐振频率的新方法[J]. 强激光与粒子束, 2012, 24(1): 3. Li Jisan, Wang Yong, Liu Wenxin. Resonant frequency computation of waveguide-loaded cavity with boundary element method[J]. High Power Laser and Particle Beams, 2012, 24(1): 3.

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