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基于数字信号处理中的半解析递归卷积(SARC)算法,提出一种用于色散介质电磁特性分析的通用递归卷积时域有限差分方法(SARC FDTD),不仅具有绝对稳定性和高精度、低内存、高效率等优点,而且对于常见色散介质模型,具有统一的形式,计算时只需给出色散介质模型的极点和对应系数,使用方便,通用性好.通过算例验证了方法的有效性,并对有等离子体存在的目标电磁散射截面(RCS)进行了计算和分析.
Based on the semi-analytical recursive convolution (SARC) algorithm in digital signal processing, a general recursive convolution time-domain finite difference method (SARC FDTD) for the analysis of the electromagnetic properties of dispersive media is proposed, which not only has absolute stability and high precision, Low memory and high efficiency, but also has a uniform form for the common dispersion medium model, and only the poles and corresponding coefficients of the dispersion medium model are required for calculation, which is easy to use and has good generality. The effectiveness of the method is verified by an example The target electromagnetic scattering cross section (RCS) with plasma presence was calculated and analyzed.