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在用时域有限差分法 (FDTD)分析色散媒质电磁问题过程中 ,采用无限冲激响应滤波器模拟媒质的色散特性 ,讨论了包括冲激响应不变法和双线性变换法等滤波器设计方法在这一新领域中的应用。改进的 FDTD法利用成熟的数字信号处理技术分析处理了色散媒质瞬变电磁场问题 ,为数字信号处理技术在时域电磁场分析领域的应用提供了新的思路。为验证此方法的有效性和可靠性 ,分别用滤波器系统模拟了不同色散媒质 ,并在此基础上用 FDTD对色散媒质电磁问题进行了分析计算 ,同时验证了结果
In the process of analyzing the electromagnetic problems of dispersive medium by the finite-difference time-domain method (FDTD), the infinite impulse response filter is used to simulate the dispersion characteristics of the medium. The filter design methods including impulse response invariant method and bilinear transform method are discussed This new area of application. The improved FDTD method uses the mature digital signal processing technology to analyze and deal with the transient electromagnetic field of dispersion media, and provides a new idea for the application of digital signal processing technology in the field of time-domain electromagnetic field analysis. In order to verify the validity and reliability of this method, different dispersion media were simulated by using filter system respectively. On the basis of this, FDTD was used to analyze and calculate the electromagnetic problems of dispersion media. At the same time,