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A Novel Three-Dimensional FDTD Subgridding Method for the Coupling Analysis of Shielded Cavity Excited by Ambient Wave
IEEE Transactions on Electromagnetic Compatibility ( IF 2.1 ) Pub Date : 2020-12-01 , DOI: 10.1109/temc.2019.2955445
Zhihong Ye , Xi Liao , Jie Zhang

The finite-difference time-domain (FDTD) method used for the coupling analysis of the shielded cavity usually needs amount of elements, which would seriously affect the computation cost. To relieve this problem, a novel three-dimensional FDTD subgridding method combined with an automesh generator technique is presented. First, the automesh generator technique is applied to read the triangular element data from the stereolithography format file of the shielded cavity to fastly mesh the structure of the cavity by the coarse and fine grids of FDTD. Then, the subgridding interfaces are separated to temporal and spatial parts to implement temporal and spatial subgridding algorithms, respectively, to obtain the electric and magnetic fields on the interfaces. To ensure the stability and continuity of the subgridding interfaces, the missing subgrid and fine grid magnetic fields nearest temporal and spatial subgridding interfaces are obtained by the Taylor expansions and linear interpolation schemes of the coarse grid magnetic fields, respectively, at the end of each fine time step. And the coarse grid electric fields in the subgrid and fine grid nearest temporal and spatial subgridding interfaces should be updated via some interpolation schemes of the subgrid and fine grid electric fields at the end of each coarse time step, respectively. The accuracy, efficiency, and longer time stability of the presented method have been verified by comparing with the finite-integration time-domain method via the simulation of a cavity with one slot excited by the plane wave. Finally, the suitability of this presented method applied for the coupling analysis of the arbitrary shielded cavity excited by the ambient wave is confirmed.

中文翻译:

一种用于环境波激发的屏蔽腔耦合分析的新型三维FDTD子网格化方法

用于屏蔽腔耦合分析的时域有限差分(FDTD)方法通常需要大量的单元,这会严重影响计算成本。为了解决这个问题,提出了一种结合自动网格生成技术的新型三维 FDTD 子网格化方法。首先,应用自动网格生成技术从屏蔽腔的立体光刻格式文件中读取三角形单元数据,通过FDTD的粗网格和细网格快速对腔结构进行网格划分。然后,将子网格化界面分为时间和空间部分,分别执行时间和空间子网格化算法,获得界面上的电场和磁场。为保证子网格化界面的稳定性和连续性,在每个精细时间步长结束时,分别通过粗网格磁场的泰勒展开和线性插值方案获得最接近时空子网格界面的缺失子网格和细网格磁场。并且在每个粗时间步长结束时,子网格和细网格最近时空子网格界面中的粗网格电场应分别通过子网格和细网格电场的一些插值方案进行更新。通过与有限积分时域方法的比较,通过模拟平面波激发的具有一个槽的腔,验证了所提出方法的准确性、效率和更长的时间稳定性。最后,
更新日期:2020-12-01
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