COMPACT FOUR-COMPONENT 2-D FDFD METHOD WITH EQUIVALENT SURFACE IMPEDANCE BOUNDARY CONDITION FOR MULTILAYER METAL-COATED WAVEGUIDE

四分量紧凑格式频域有限差分法对多层镀膜矩形波导传播特性的分析(英文)

A compact four-component two-dimensional （2-D） finite-difference frequency domain （FDFD） method with the equivalent surface impedance boundary condition is used to analyze the dispersion characteristics of multilayer metal-coated waveguides. According to the equivalent surface impedance boundary condition,the relationship between transverse field components on the boundary can be easily depicted. Once the eigen equation is solved,the propagation constant can be obtained as the eigen value for a given frequency. Results of the proposed method agaree well with those of high frequency structure simulator（HFSS）.

在紧凑格式频域有限差分法分析有耗规则导波结构时,传统方法需要6个场分量来描述良导体的表面阻抗边界条件,导致边界上场分量的关系复杂,且也不适用于多层镀膜边界问题。为此利用四分量紧凑格式频域有限差分法,结合等效表面阻抗边界条件可以方便地描述切向场在多层镀膜边界上的关系,不但适用于有耗边界,也适用多层镀膜边界。经过填充系数矩阵得到切向场分量的本征方程,即可计算出特定频率下的传播常数。在相同配置和精度要求下,其结果与高频电磁场仿真软件吻合良好。