用FDTD法计算部分介质填充波导的截止频率  

FDTD method analysis of cut off frequency of Waveguides Partially Filled with Dielectric

作　　者：姚斌[1] 郑勤红[1] 帅春江[1] 张学庆[1] 刘玲丽[1] 

机构地区：[1]云南师范大学物理与电子信息学院,云南昆明650092

出　　处：《云南师范大学学报（自然科学版）》2006年第4期52-55,共4页Journal of Yunnan Normal University:Natural Sciences Edition

基　　金：国家自然科学基金资助项目(10365002);云南自然科学基金资助项目(2004A028M)

摘　　要：给出用时域有限差分(FDTD)方法计算电磁场问题的差分格式,详细介绍了FDTD法分析介质填充波导截止频率的计算过程。实例计算了空心矩形波导的截止频率,并与理论值进行比较;计算了填充部分介质时矩形波导和双脊波导的截止频率,获得了三脊波导的归一化截止频率谱图,给出填充不同介质时各主模式的截止频率。This paper presents the method of computation for waveguides partially filled with dielectric by using finite-difference time--domain（FDTD） method. In order to demonstrate the availability of the method, the resonant frequency of empty rectangular waveguide was calculated and a comparison was given. As an application, representative computational examples, including dielectric -rod-loaded rectangular and double-ridged waveguides, are given to validate the theory, and to demonstrate the degree of its efficiency. At last, resonant frequency of tri-ridged waveguide partially filled with dielectric are presented.

关 键 词：时域有限差分法 脊波导 截止频率 

分 类 号：O451[理学—无线电物理]