介质粗糙面与组合目标宽带电磁散射特性研究

Study on electromagnetic scattering characteristics of rough dielectric surfaces and composite targets in wideband range

文中对介质粗糙面和组合目标的宽带复合电磁散射特性进行研究,通过数值计算得到了复合散射系数频率响应曲线。分析结果显示,后向复合散射系数在宽频带范围内随着频率的变化而产生振荡,粗糙面的高度均方根、介电常数、组合目标尺度、目标介电常数等因素对复合散射系数有显著的影响,且影响规律较为复杂。相比之下,粗糙面的相关长度对复合散射系数的影响较为微弱。当目标是理想导体时,频率响应曲线近似呈现出准周期性的振荡形态。

The composite electromagnetic scattering characteristics of rough dielectric surface and composite targets in wideband range are studied.The frequency response curve of composite scattering coefficient is obtained by numerical calculation.The analysis results show that the backscattering coefficient exhibits oscillatory variations with frequency in the range of wide frequency band,and parameters such as the root mean square(RMS)of the rough surface height,dielectric constant,scale of the composite target,and the target's dielectric constant exhibit significant influence on the backscattering coefficient,with more complicated influence law.Conversely,the influence of the correlation length of the rough surface on the composite scattering coefficient is relatively week.When the target is an ideal conductor,the frequency response curve approximates a quasi⁃periodic oscillation.