一种超宽带、轻质、宽入射角超材料吸波体的拓扑优化设计

The design and optimization of an ultra-broad band,light-weight,and wide incident angle metamaterial absorber based on topology optimization

基于电阻型频率选择表面,通过遗传算法进行拓扑优化的方法,设计了一种具有超宽带、轻质、宽入射角和极化不敏感特性的超材料吸波体,该吸波体的吸收率在90%以上的带宽为3.4-23.2GHz,相对带宽高达149%,并且针对TE极化,当入射角增加至55°时,吸收率均仍保持在80%以上;对于TM 极化,该吸波体保持90%以上吸收率到70°.由于采用聚氨酯泡沫作为基体,该吸波体面密度仅为0.35/cm^3.设计的超材料吸波体具有易于实现的特点,具有良好的应用前景.同时该拓扑设计的方法还可应用到左手材料、频率选择表面的超材料设计中.

According to topology optimization and genetic algorithm,a light,wide-band,insensitive of incident and polarized angle metamaterial absorber composed of the resistance frequency selective surface( RFSS). The range of absorption over 90% is range from 3. 4 to 23. 2 GHz and the relative band was 149%. The absorber can maintain the absorption over 80% with TE polarization to 55° and it keep large than 90% to 70° with TM polarization. The areal density was only 0. 35 g / cm3,meanwhile,the absorber was easy to be fabricated; meanwhile,the topology optimization method can be used in the design of frequency selective surface and left-hand material.