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研究了一种3D新型时域有限差分法(FDTD)非分裂场近似完全匹配层(NPML)吸收边界。在直角坐标系中,通过直接对麦克斯韦方程组中的空间偏导的变量进行空间坐标拉伸,得到三维非分裂场的NPML吸收边界,这种吸收边界相对于PML吸收边界编程实现简单,编程复杂度低。通过对三维算例的电磁散射分析,验证了NPML吸收边界的正确性。计算结果表明了该方法是一个完美的吸收边界,可以用于实际目标的电磁散射问题分析。
A novel 3D FDTD non-splitting field near perfect matching layer (NPML) absorption boundary was studied. In Cartesian coordinate system, the NPML absorption boundary of three-dimensional non-splitting field is obtained by directly spatial-offsetting the space-dependent variables in Maxwell’s equations. The absorption boundary is relatively simple and complicated to program with respect to PML absorption boundary Low degree. Through the electromagnetic scattering analysis of the three-dimensional example, the correctness of NPML absorption boundary is verified. The calculation results show that the method is a perfect absorption boundary and can be used to analyze the electromagnetic scattering problem of the actual target.