介质参数对吸收体电磁散射影响的研究

Research on Electromagnetic Scattering of Absorber Affected by the Parameter of Dielectric

二维周期渐变微波吸收体由金属基体和涂敷有耗介质构成。有耗介质的厚度、介电常数和磁导率是影响吸收体电磁散射特性的主要因素,因此有必要分析这些参数对吸收体电磁散射特性的影响。根据吸收体的二维周期性结构特点,把分析介质参数对吸收体雷达散射截面(RCS)的影响简化成分析介质参数对涂敷导体二面角RCS的影响。利用矩量法给出涂敷导体二面角的RCS随介质参数变化的计算例子,并结合天线阵列技术算出最佳介质厚度时吸收体的RCS。

Various absorber of two-dimension periodic is composed of metal base and coating of lossy dielectric. The thickness of lossy dielectric and permittivity and permeability are the main factors to affect the electromagnetic scattering of absorber, hence it is valuable to analyze those parameters which can affect the electromagnetic scattering of absorber. According to the character of two-dimension periodic of absorber, the effect of dielectric parameter to the scattering of double dihedrals of coding conduct was analyzed instead of analyzing the whole absorber. Examples of computation of the scattering of double di- hedrals of coding conduct which can be changed according to dielectric parameter were illustrated by using the moments method. Furthermore, RCS of absorber was computed by using the moments method and technology of antenna array when the thickness of dielectric is the most appropriate.