FDTD 法局部网格细化技术及其边界源等效模型

IMPLEMENTATION OF THE SUBGRIDDING TECHNIQUE AND ITS MODELING BOUNDARY SOURCES IN FDTD METHOD

讨论了时域有限差分（ＦＤＴＤ）法中局部网格细化技术的实现，给出了边界源的等效模型．利用一个简单的计算实例———ＴＭ平面波入射下方形介质柱的散射分析，证明了该等效源模型的正确性，同时也说明了方法的有效性．

In this paper,the implementation of the subgridding technique in the FDTD method is discussed,and the modeling boundary sources on the coarse_fine grid boundary are given.A simple problem,the case of scattering of incident plane TM waves by a square dielectric cylinder, is solved by the subgridding technique with the model of the boundary sources proposed in this paper. Numerical results have verified the efficiency of the method and the validity of the modeling boundary sources.