各向异性介质涂覆曲面导体目标的散射

由于各向异性介质电磁参数为张量形式,使得各向异性介质涂覆导体目标的电磁散射建模和精确计算相当复杂和困难.引入高阶张量阻抗边界条件,可以大大简化建模过程,提高计算效率.论文针对各向异性介质涂覆曲面导体目标,采用基于平面近似的高阶张量阻抗边界条件,将一维二阶张量阻抗边界条件应用于柱面涂覆目标,二维二阶张量阻抗边界条件应用于三维曲面涂覆目标上,建立二者的高阶张量阻抗边界条件解.设计算例仿真,并与精确解/矩量法解比较.通过仿真,研究了各向异性介质涂覆目标电尺寸、涂覆厚度以及目标形状对高阶张量阻抗边界条件解的精度的影响.

Scattering of Curved Conducting Targets Coated with Anisotropic Material

It is difficult and complicated to analyze the electromagnetic scattering of curved conducting targets coated with anisotropic material because of the tensor form of material coefficients. If Higher Order Tensor Impedance Boundary Conditions (HOTIBCs) are applied, the problem will be considerably simplified and the efficiency of the problem solution will be improved greatly. In our previous paper[3], we studied the scattering of planar conducting target coated with anisotropic material. Now we report our further research results on curved conducting targets. Sections 1 and 2 of the full paper explain how to apply HOTIBCs to curved conducting targets. Subsection 1.1's title is: the HOTIBCs for cylindrical conducting target coated with anisotropic material. Subsection 1.2's title is: calculating the scattering of the cylindrical conducting target. Subsection 2.1's title is: the HOTIBCs for body of revolution conducting target coated with anisotropic material. Subsection 2.2's title is: calculating the scattering of body of revolution conducting target. Several numerical examples were designed. The simulation results were compared with the exact solution-Mie or Method of Moment solution. Simulation results, presented in Figs.2 through 6, demonstrate preliminarily that: (1) the accuracy of HOTIBCs increases with increasing electric size of target and decreases with increasing thickness of the coated material; (2) higher order TIBCs provide higher accuracy than lower order ones; (3) the accuracy of HOTIBCs deteriorates if the coated targets have tips or sharp corners.