任意磁化方向铁氧体电磁散射时域有限差分分析的Z变换方法

利用坐标系转换矩阵给出实验室系中饱和磁化铁氧体的频域磁化率张量, 采用部分分式展开方法通过Z变换得到磁化率张量的Z域形式, 给出了任意磁化方向铁氧体电磁散射的Z变换-时域有限差分算法. 计算了饱和磁化铁氧体球的同极化和交叉极化后向雷达散射截面, 结果表明了算法的正确有效性. 关键词： Z变换 饱和磁化铁氧体 电磁散射 时域有限差分方法

Z-transform algorithm in the finite-difference time domain analysis of ferrite subject to an arbitrary direction of external magnetic field

The susceptibility tensor of saturated magnetized ferrite in frequency domain in laboratory coordinate system is gained by using the transfer matrix between the principal and the laboratory system, and then its form in Z-domain is derived by Z-transform (ZT). The ZT-finite-difference time domain method applied to the ferrite subject to an arbitrary direction of external dc magnetic field is obtained. The co-polarized and cross-polarized backward radar scattering cross-section for a saturated magnetized ferrite sphere are obtained by the presented algorithm. The computed results indicate the correctness and feasibility of the method.
Keywords： Z-transform saturated magnetized ferrite electromagnetic scattering finite-difference time-domain method