摘要
本文采用共形网格的ＦＤＴＤ法对任意截面导体柱的电磁散射特性进行了分析。首先采用广义环路积分法导出共形网格上的时域有限差分方程，然后针对共形网格导出其一阶和二阶吸收边界条件。这种吸收边界条件在曲率半径趋于无穷大时分别退化为一阶和二阶Ｍｕｒ 吸收边界条件。由于采用共形网格，网格节点数远少于普通ＦＤＴＤ法中的节点数，从而大大节省了计算时间和存储空间。在时谐平面波和高斯脉冲激励下，首先计算了导体柱表面的时域感应电流，然后运用Ｆｏｕｒｉｅｒ变换计算导体柱的ＲＣＳ，其结果与其它文献结果一致。
In this paper, the FDTD method with conformal m eshes is presented to analyze the electromagnetic scattering of conducting cylin ders with arbitrary cross sections. First, the Time Domain Finite Difference equation is derived by using the generalized loop integration technique. Then, an Absorbing Boundary Condition (ABC) for the conformal meshes is derived. Becau se of the conformal meshes, the number of mesh nodes is far less than that in th e conventional FDTD method. It results in dramatic saving of memory and computin g time.Finally, we calculated the time domain surface currents of the conductin g cylinder, then got the RCS of conducting cylinder with Fourier's transform. Th e results are in good agreement with that reported in other papers.
出处
《微波学报》
CSCD
北大核心
1999年第3期227-233,共7页
Journal of Microwaves
基金
国家杰出青年基金
