填充多层互易手征介质金属圆波导的传播特性  

Propagation Characteristics of Metal Circular Waveguide Filled with Multilayer Reciprocal Chiral Media

作　　者：熊天信[1] 杨儒贵[2] 

机构地区：[1]四川师范大学物理与电子工程学院,四川成都610066 [2]西南交通大学电磁所,四川成都610031

出　　处：《西南交通大学学报》2008年第5期588-594,共7页Journal of Southwest Jiaotong University

基　　金：四川省教育厅重点项目(2003A079)

摘　　要：采用分离变量法,导出了填充多层互易手征介质的圆波导的模式特征方程,进而可得填充普通介质的圆波导的模式特征方程.为揭示填充多层互易手征介质圆波导的传播特性,给出了填充1层和2层互易手征介质圆波导部分模式的色散特性数值计算结果.结果表明,影响圆波导传播特性的主要因素是互易手征介质的折射率;当互易手征介质的磁导率变化,而折射率、手征参数和2层介质的半径之比不变时,其归一化截止频率明显变化;当2层互易手征介质参数不变,改变它们的半径之比时,对其低次模归一化截止频率影响很小,因此,想通过改变2层互易手征介质的半径之比达到显著改变其低次模归一化截止频率和归一化带宽不可取.With the method of separation of variables, the general mode eigenequation of the metal circular waveguide filled with multilayer reciprocal chiral media was given. From the general eigenequation, the mode eigenequation of metal circular waveguide filled with an ordinary medium can be obtained. To reveal the propagation characteristics, numerical results for some modes in the metal circular waveguide filled with one or two layers of reciprocal chiral media were presented. The research results show that the main factor influencing the propagation characteristics is the refractive index of the reciprocal chiral media filled in it. When the permeability of the reciprocal chiral media filled in it is changed but the refractive index, chiral parameters and the ratio of the outer radii of the first and the second layers are given, the normalized cut-off frequency will obviously change. When the parameters of the reciprocal chiral media filled in it are given but the ratio of the outer radii of the two layers is changed, the normalized cut-off frequency of low-order modes changes slightly. Therefore, changing the ratio of the outer radii of the two layers is not a good approach to change the normalized cut-off frequency of low-order modes and normalized bandwidth of the metal circular waveguide.

关 键 词：电磁场 传播特性 特征方程 圆波导 互易手征介质 

分 类 号：TN814.5[电子电信—信息与通信工程]