An improved shift operator finite-difference time-domain method based on digital signal processing technique for general dispersive medium
一种基于数字信号处理技术的改进通用色散介质移位算子时域有限差分方法

An improved shift operator finite-difference time-domain (SO-FDTD) method for general dispersive medium based on the implementation of infinite impulse response filter in digital signal processing technique is presented. Compared with the commonly used SO-FDTD,the storage variables in the improved SO-FDTD are reduced by 33% and computational efficiency is also increased. Finally,the generality and the feasibility of the presented scheme are validated by calculations of scattering by first order and second order dispersive objects.