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基于表面阻抗边界条件时域有限差分(FDTD)方法研究了一维斜入射情况下非磁化等离子体薄涂层涂敷金属材料的电磁散射特性,该方法忽略对薄层背景材料进行网格剖分,大大减少了计算量.首先推导了理想导体涂敷等离子体薄涂层的表面阻抗频域表达式,然后代入边界条件并变换到时域,再用分段线性递推卷积方法将时域表达式离散得到FDTD迭代式.编程计算了垂直及斜入射情形下的平行极化和垂直极化反射系数,通过验证算例与解析解对比,结果表明该方法的准确性和有效性.最后利用该方法分析了不同入射角对反射系数的影响.
The electromagnetic scattering characteristics of non-magnetized plasma thin film coated metallic materials under one-dimensional oblique incidence are studied based on the finite-difference time-domain finite difference (FDTD) method of surface impedance boundary conditions. This method ignores the meshing of thin background materials , Which greatly reduces the computational cost.Firstly, the expression of the surface impedance of the ideal conductor coated plasma thin coating is deduced and then substituted into the boundary conditions and transformed into the time domain, then the piecewise linear recursive convolution method is used to separate the time domain The FDTD iterative method is obtained by discretely solving the expressions.The parallel polarizations and the vertically polarized reflection coefficients are calculated in the case of vertical and oblique incidences by comparing the calculated results with analytic solutions.The results show that the method is accurate and effective.Finally, The method analyzes the influence of different incident angles on the reflection coefficient.