分形粗糙表面涂覆目标太赫兹散射特性

Electromagnetic Scattering Characteristics of Fractal Rough Coated Objects in the Terahertz Range

该文采用物理光学法方法研究了具有分形粗糙表面的涂覆目标太赫兹散射特性。基于分形粗糙面建立表面粗糙目标模型,根据菲涅尔反射系数得出表面电流分布进而得到涂覆粗糙目标的雷达散射截面。对比分析了具有粗糙表面和光滑目标的散射结果,详细讨论了不同频率、不同涂层厚度的表面粗糙钝锥目标模型的太赫兹散射特性,计算结果表明在太赫兹波段目标表面的粗糙度对散射有显著的影响。

Based on the physical optics method, the scattering characteristics of fractal rough surface coated objects are studied in the terahertz（THz） range herein. A blunt model based on fractal rough surfaces is built.The surface current is calculated according to the Fresnel reflection coefficient, and the Radar Cross Section（RCS） of the rough coated target is obtained. The RCS of rough and smooth surface targets are compared.Numerical results for a rough coated blunt cone model are provided, and discussed from the perspective of different frequencies and coating thickness values. The results show that the surface roughness of the target has a significant effect on scattering in the terahertz range.