用时域有限差分法分析涂敷目标的电磁散射特性

Analysis of the Electromagnetic Scattering Properties of the Coating Target with the Finite-Difference Time-Domain Method

为了有效分析涂敷目标的宽带电磁散射特性,采用计算电磁学的时域有限差分方法,分别对涂敷各向同性和单轴各向异性吸波材料的目标进行了计算.研究了涂敷材料厚度、阻抗匹配等因素对目标雷达散射截面的影响.结果表明,当涂敷材料的电磁参数满足匹配条件时,对电磁波的吸收性能最好,从而可以有效地缩减目标的雷达散射截面.

In order to analyze electromagnetic scattering properties of a coating target in wide -band efficiently, one of computational electromagnetic methods, the finite - difference time - domain method has been used in this research. Some of the targets coated with lossy isotropic or anisotropic absorbing materials have been reviewed. The radar cross section （RCS） of these targets, which are affected by the thickness and impedance matching of the coated materials, has been investisated. Simulating results show that the absorbing properties for the electromagnetic wave are very good when parameters satisfy the matching condition, and therefore, the RCS of targets can be reduced significantly.