任意行波管慢波结构中导体和介质损耗的三维有限元分析

Three-dimensional Finite-element Analysis of Conductivity and Dielectric Attenuation in Arbitrary Slow-wave Structure of Traveling-wave Tubes

该文给出一种用于精确计算任意行波管慢波结构中介质和导体损耗的3维有限元分析方法。给出一种新型的慢波结构指定频率本征分析方法。不像传统的指定相移本征分析方法在慢波结构有耗有限元仿真中必须求解一个非线性的广义本征问题,指定频率本征分析方法仅仅需要求解一个线性的广义本征问题,而且慢波结构的导体和介质损耗可以不需要任何的后处理而精确地得出。通过仿真实际的慢波结构,验证了指定频率本征分析方法可以精确地计算出慢波结构的导体和介质损耗。

This paper presents a novel 3-D finite-element analysis method for arbitrary lossy Slow-Wave Structure （SWS） of the traveling-wave tube. In this analysis method, a new Frequency-Specified Eigenmode Analysis （FSEA） for SWSs is proposed and utilized. Unlike the traditional phase-advance-specified eigenmode analysis for SWSs which has to solve a nonlinear Generalized Eigenvalue Problem （GEP）, the new FSEA approach only needs solving a linear GEP and is capable of obtaining the attenuation constant more accurately and directly without any post-processing when simulating the lossy SWSs.