填充多层互易手征介质金属同轴线传播特性  

Propagation characteristics of metal coaxial lines filled with multi-layer reciprocal chiral media

作　　者：熊天信[1] 邓洪[1] 

机构地区：[1]四川师范大学物理与电子工程学院,成都610066

出　　处：《强激光与粒子束》2006年第10期1657-1662,共6页High Power Laser and Particle Beams

摘　　要：采用在圆柱坐标系中分离变量的方法,推出填充多层互易手征介质的金属同轴线各层电磁场之间的关系,得到其模式特征方程和圆波导模式特征方程,给出了填充两层手征介质金属同轴线部分模式的色散特性的数值计算结果,分析了手征介质参量及两层手征介质厚度变化等对手征同轴线传播特性的影响。如果互易手征介质的手征参数等于零,可得填充普通介质的同轴线的模式特征方程。与填充普通介质的同轴线中的模式相比,手征同轴线中的模式发生了分叉。当同轴线中所填介质的折射率增大时,其模式归一化截止频率和进行基模单模传输的带宽归一化频率都将减小。By employing the method of the separation of variables in the circular-cylindrical system, a recursive formula for the electromagnetic fields in the metal coaxial line filled with multi-layer reciprocal chiral media is derived. The general mode eigenequation is given. In the same way the eigenequation for the metal circular waveguide filled with multi-layer reciprocal chiral media can also be obtained. From the general eigenequations of the metal coaxial line and the metal circular waveguide filled with multi-layer reciprocal chiral media, the mode eigenequations of the coaxial line and the circular waveguide filled with one-layer reciprocal chiral medium can be obtained. When the chiral parameter equals zero, the mode eigenequation of the metal coaxial line filled with ordinary one-layer medium can be obtained. The mode eigenequation is consistent with that of the related scientific literatures. The mode eigenequation shows that the modes have been bifurcated comparing the modes in the coaxial line filled with ordinary one-layer medium. To analyze the propagation characteristics of the metal coaxial line filled with multi-layer reciprocal chiral media, numerical results of the mode in the metal coaxial line filled with two-layer reciprocal chiral media are presented about the mode dispersion characteristics. The numerical results show that the propagation characteristics of the metal coaxial line are influenced by the chiral media and the thickness of the chiral media. When the value of the refractive index of the medium filled in the coaxial line increases, the normalized cutoff frequency and the normalized bandwidth will decrease to transmit single mode in the coaxial line.

关 键 词：同轴线 互易手征介质 传播特性 特征方程 

分 类 号：TN814.5[电子电信—信息与通信工程]