【摘要】 本文提出一种新的适用于各种复杂色散媒质的时域有限差分法 ,将色散媒质表征为一组无限冲激响应滤波器 (IIR) ,由此导出基于介电常数和导电系数的时域有限差分方程 ,并对算法的稳定性条件和数值色散关系进行分析 .这种改进的FDTD能分析与频率有关的电磁场问题 .为验证该方法的有效性和可靠性 ,本文用冲激响应不变法设计IIR滤波器模拟色散媒质 ,并对高斯脉冲入射色散媒质的情况进行数值模拟 ,结果与解析值完全吻合更多还原

【Abstract】 A new frequency dependent FDTD method using DSP is presented for arbitrary frequency dispersive medium.The dispersive medium is characterized as a set of infinite impulse filters (IIR).Two algorithms employing frequency dependent permittivity and frequency dependent conductivity are derived.Their stability criteria and numerical dispersion are also studied.In order to demonstrate the effectiveness of this approach, several numerical examples are given in this paper.更多还原