多层吸波材料的优化设计模型

Optimization model for designing multilayer absorbing material

通过优化设计,建立了多层吸波材料的理论模型.研究结果表明,多层吸波材料的最大吸收反射率与材料厚度的成单调递增关系,同时频宽却向低频方向发生偏移;反射损失(RL)<-10d B的频宽随着厚度增加而减小;双层吸波材料的吸波频率范围比单层吸波材料的宽,三层吸波材料的吸波频宽进一步增大,且在C波段和Ku波段有最大反射损失吸收峰.各单层吸波材料具有不同的电损耗和磁损耗性能,经过优化设计复合后,多层吸波材料中各层吸波材料的优异性能的合理叠加使吸波频宽增大.模型的计算结果与实验测定结果的吻合度很好.

A theoretical model of multi-layer absorbing material is established for optimal design of multilayer structure of the absorbing material according to the working mechanism of the absorbing material.The results indicate that the maximum absorption reflectance and bandwidth are closely related with thickness of absorbing material both for single and multi-layer absorbing material. The maximum absorption reflectance increases and offsets to low frequency with the thickness increases. The bandwidth of Reflection Loss（ RL） - 10 d B decreases in that case. Absorbing frequency range of absorbing material in double layer is larger than that in single layer. Absorbing frequency range of absorbing material increase more in three layer of absorbing material,and the biggest loss reflected absorption peaks appeared two in C band and Ku band compared with one in single and double layer. This is because single absorbing materials have different frequency band of electric loss and magnetic loss. Frequency band of electric loss and magnetic loss of three layers absorbing material stack and interact with each other when single layer absorbing material compound together. Each layer of absorbing material excellent performance can be effective and reasonable stack when multilayer microwave absorbing materials compound together through the optimized design. Therefore,absorbing bandwidth increases in this case. The model results have very good alignment with experimental determination results.