任意截面波导的模式截面场的数值分析  

The numerical analyses of field distributions of cross section for modes in a waveguide having an arbitrary cross section

作　　者：喻志远[1] 

机构地区：[1]电子科技大学应用物理研究所,四川成都610054

出　　处：《电波科学学报》2001年第3期291-294,314,共5页Chinese Journal of Radio Science

摘　　要：给出了任意截面波导的传输特性的时域差分 ( FDTD)数值方法的一般分析方法。首次提出了用数值方法建立任意截面波导中各模式横向场分量截面场分布的方法。为证明这种方法的有效性 ,计算了常用空气填充的 Ka波段矩形波导中主模 ( H10模 )和一次高阶模式 H2 0 模的截止波长和 Ey场分量 ,其与理论值的完全一致性表明所提出的方法是正确的。This paper presents the general method of numerical analyses of the propagation constants for the waveguides having arbitrary cross section by using the FDTD calculation. It firstly presents the numerical field distributions in the cross section of the waveguide for each mode. In order to demonstrate the availability of the method, we calculated the cutoff frequencies of dominate mode H 10 and the first higher order mode H 20 in a Ka band rectangular waveguide (WG28) and the numerical field distributions for the field component Ey. The excellent agreements between the theoretic values and the calculate dones for the cutoff frequencies and the field distributions show that the presented method is correct. As an application the propagation constants and the field distributions of components En in the cross section for four lowest modesof a new pentagon waveguide are presented.

关 键 词：时域有限差分法 数值场分布 波导 模式截面场 

分 类 号：TN814[电子电信—信息与通信工程]