磁化铁氧体材料电磁散射递推卷积-时域有限差分方法分析

根据递推卷积原理，将磁化铁氧体材料的频域磁导率过渡到时域，通过引入时域复数磁化率张量和时域复数磁感应强度矢量，提出了磁化铁氧体材料电磁散射的三维时域有限差分方法.为了验证该方法，用它计算了磁化铁氧体球的后向雷达散射截面，与文献结果符合很好.计算结果表明，该方法是分析磁化铁氧体材料电磁散射一种可行的方法. 关键词： 递推卷积 磁化铁氧体 电磁散射 时域有限差分方法

A recursive convolution-finite-difference time-domain implementation of electromagnetic scattering by magnetized ferrite medium

The permeability of magnetized ferrite medium in the frequency domain is transformed to the time domain， and the complex magnetic susceptibility dyadic matrix and the complex magnetic strength vector in time domain are introduced. A recursive convolution-finite-difference time-domain (RC-FDTD) method of electromagnetic scattering by magnetized ferrite medium is analysed in detail based on the convolution principle. To exemplify the availability of the algorithm， the backscattering radar scattering section of a magnetized ferrite sphere is computed， and the numerical results are the same as the reference values， which shows that the RC-FDTD method is correct and efficient.