本文根据三种色散介质模型(即德拜模型,洛仑兹模型和德鲁模型)的介电系数线性组合可写成以j?为自变量的分式多项式形式的特点,在文献[5]的基础之上,将移位算子时域有限差分方法(SO-FDTD)推广,使其适于色散介质混合模型电磁计算的需要。数值计算结果和解析解的比较说明了本文算法的可行性。 According to the linear combination of dielectric permittivity of three kinds of dispersion medium models (ie Debye model, Lorentz model and Drew model), we can write the characteristic of the fractional polynomial form with j? As an independent variable, and in [5] Based on this, the shift operator finite difference time domain method (SO-FDTD) is generalized to make it suitable for the electromagnetic calculation of dispersion media mixed model. The comparison between numerical calculation and analytical solution shows the feasibility of the proposed algorithm.