电各向异性色散介质电磁散射的三维递推卷积-时域有限差分方法分析

根据递推卷积原理，将磁化等离子体的频域介电系数过渡到时域，通过引入时域复数极化率张量和时域复数电位移矢量，得到了磁化等离子体的三维时域有限差分方法迭代式. 为了验证该方法，用它计算了非磁等离子体球的后向雷达散射截面，与移位算子法结果符合很好. 应用该方法计算和分析了磁化等离子体球的电磁波散射，发现其后向散射时域波形明显出现了交叉极化分量. 关键词：递推卷积磁化等离子体电磁散射时域有限差分方法

Three-dimensional finite-difference time-domain implementation for anisotropic dispersive medium using recursive convolution method

The permittivity in the frequency domain is transformed to the time domain, and the complex electric susceptibility dyadic matrix and the complex electric displacement vector in time domain are introduced. The three_dimensional finite_difference time_domain method based on the recursive convolution principle(RC_FDTD) for the electric anisotropic dispersive medium is discussed in detail. To exemplify the availability of the RC-FDTD algorithm, the backscattering RCS of a non-magnetized plasma sphere is computed, and the numerical results are the same as that of shift operator_FDTD method, which shows that the RC-FDTD method is correct and efficient. In addition, the co-polarized and cross-polarized backscattering waves in time domain for a magnetized plasma sphere are obtained by the RC-FDTD algorithm. The results show that when the external magnetic field is implemented, the cross-polarized component appear evidently.