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基于伸展坐标完全匹配层方程和辅助微分方程方法,给出了一种在时域有限差分(FDTD)计算中适用于常见色散介质的通用边界条件算法.该算法适用于任意阶的FDTD空间差分,并且由于所采用的D-H方程独立于计算区域,所以可以被用于截断任意电介质.数值试验结果表明,与卷积完全匹配层算法相比较,所提出的吸收边界条件算法不仅通用性强、计算复杂度低、计算时间短,并且吸收效果有明显的提高.
A general boundary condition algorithm suitable for common dispersive media in finite-difference time-domain (FDTD) calculation is presented based on the extended matching complete matching equation and the auxiliary differential equation method. The algorithm is suitable for FDTD space difference of arbitrary order, And the DH equation adopted can be used to cut off any dielectric since the DH equation is independent of the calculation area.The numerical results show that compared with the convolution exact matching algorithm, the proposed absorption boundary conditions algorithm is not only versatile and computationally complex Low degree, the calculation time is short, and the absorption effect has been significantly improved.