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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。
In the compact format frequency-domain finite difference method for analyzing waveguide with dissipative rules, the traditional method requires six field components to describe the surface impedance boundary conditions of a good conductor, resulting in a complicated relationship between the components of the boundary field and not suitable for multilayer coatings Boundary issue. For this reason, the four-component compact format frequency-domain finite difference method and the equivalent surface impedance boundary conditions are used to describe the relationship between the tangential fields and the multi-layer coating boundary conveniently, which is not only applicable to the depletion boundary but also to the multi-layer coating boundary. After the eigenvalue of the tangential field component is obtained by filling the coefficient matrix, the propagation constant at a specific frequency can be calculated. Under the same configuration and accuracy requirements, the result is in good agreement with the high-frequency electromagnetic field simulation software.