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A super absorbing boundary condition for the analysis of waveguide discontinuities with the finite-difference method

机译:有限差分法分析波导不连续性的超吸收边界条件

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摘要

A super absorbing boundary condition is presented for the analysis of waveguide discontinuities with the finite difference method (FDM). The discontinuity region is enclosed by the waveguide wall and two truncated planes at input and output waveguides, respectively. On the wall, homogeneous conditions are available. At mesh nodes in the region, finite-difference (FD) equations can be applied. When the truncated planes are far away from the discontinuity, the conventional dominant mode transmission condition can be used for deducing the FD-type local equation at the terminated mesh nodes. A super absorbing boundary condition presented in this letter can be used to terminate the meshes very close to the discontinuity. It results in dramatic savings in computing time and memory needs.
机译:提出了一种超吸收边界条件,用有限差分法(FDM)分析波导的不连续性。不连续区域分别被波导壁和输入和输出波导处的两个截平面所包围。在墙壁上,可以使用均匀的条件。在该区域的网格节点上,可以应用有限差分(FD)方程。当截断平面远离不连续点时,可以使用常规的主导模式传输条件来推导终止的网格节点处的FD型局部方程。这封信中提出的超吸收边界条件可用于终止非常接近间断的网格。这样可以大大节省计算时间和内存需求。

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