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提出了一种新的 N阶色散媒质的时域分析方法 ,并将其表征为一组无限冲击响应滤波器 ,将色散媒质在 FDTD中的表述问题转化为数字滤波器 (IIR)的设计问题。改进 FDTD能分析处理与频率有关的电磁场问题。为验证此方法的有效性和可靠性 ,用此方法计算了高斯平面波脉冲入射 N阶色散媒质的情况 ,计算结果与解析值非常吻合。
A new time-domain analysis method of N-th dispersion medium is proposed and characterized as a set of infinite impulse response filters. The problem of representation of dispersion medium in FDTD is transformed into the design problem of digital filter (IIR). Improved FDTD can analyze and deal with frequency-dependent electromagnetic fields. In order to verify the validity and reliability of this method, the Gaussian plane wave impulsive incident N-order dispersion medium was calculated by this method. The calculated results are in good agreement with the analytical values.