蜂窝结构吸波材料等效电磁参数和吸波特性研究

根据强扰动理论，在长波长近似条件下推导出蜂窝结构吸波材料等效介电常数和等效磁导率的计算公式.电磁参数计算结果表明，蜂窝结构吸波材料等效介电常数和等效磁导率均小于吸收层的介电常数和磁导率，但等效介电常数的降幅更大，从而使等效介电常数更接近于等效磁导率，这正是吸波材料波阻抗匹配设计所需要的.反射率计算结果表明，不同的蜂窝高度，吸收层对应一最优厚度，使蜂窝结构吸波材料的反射率最低.这些结果对于蜂窝结构吸波材料设计具有一定的意义. 关键词： 蜂窝结构吸波材料 等效介电常数 等效磁导率 反射率

Study on equivalent electromagnetic parameters and absorbing properties of honeycomb-structured absorbing materials

Based on strong interference theory and the assumption of long wave band，formulae for computing the equivalent electromagnetic parameters of honeycomb-structured absorbing materials are presented. It is pointed out that the equivalent permeability and permittivity of honeycomb-structured absorbing materials are smaller than those of the absorbing layer， but the equivalent permittivity is reduced more significantly， so the equivalent permeability is more close to the equivalent permittivity. This is helpful for the design of impedance matching of absorbing materials. It is indicated by reflectivity results that the absorbing layer should have an optimum thickness to make the reflectivity minimal for honeycomb-structured absorbing materials with different height of honeycombs. These results are useful for design of honeycomb-structured absorbing materials.