基于超材料设计的羰基铁低频复合吸波涂层研究

Carbonyl Iron Composite Microwave Absorbing Coating Basedon Metamaterial Design

摘要:

为获得低频宽带吸波材料,本文采用共沉淀和原位聚合技术制备了羰基铁/CoFe₂O₄/PANI三元复合材料,并以此为介质层,借鉴超材料思想,设计了一种基于超材料结构的羰基铁复合吸波涂层,改善了低频吸波性能。分析了超材料的结构设计对羰基铁/CoFe₂O₄/PANI涂层吸波性能的影响,并对赋予超材料结构后的复合涂层的吸波机理进行了研究和讨论。通过仿真优化发现,在电阻膜方阻值为10mΩ/□和镂空十字电阻膜图案尺寸达到最佳时,在相同厚度下赋予超材料结构后的复合涂层具有比单一羰基铁涂层更宽的吸收频带以及更低的吸收频率,在3.8-6.9GHz频段内反射率均小于-10dB。研究表明,将超材料结构融入到羰基铁涂层性能改进中,能够有效提升其低频吸波性能。

Abstract:

In order to obtain low-frequency broadband absorbing materials, carbonyl iron/CoFe₂O₄/PANI ternary composites were prepared by co-precipitation and in-situ polymerization techniques. Using this as a dielectric layer, a metamaterial-based structure was designed based on the idea of metamaterials. The carbonyl iron composite absorbing coating improves the low frequency absorbing properties. The effects of the structural design of metamaterials on the absorbing properties of carbonyl iron/CoFe₂O₄/PANI coatings were analyzed, and the absorbing mechanism of the composite coatings with superstructures was studied and discussed. Through simulation optimization, it is found that when the resistance of the resistive film is 10mΩ/□ and the pattern size of the hollow cross-resistive film is optimal, the composite coating after giving the metamaterial structure at the same thickness has a wider width than the single carbonyl iron coating. The absorption band and the lower absorption frequency are less than -10 dB in the 3.8-6.9 GHz band. Studies have shown that the integration of metamaterial structure into the performance improvement of carbonyl iron coating can effectively improve its low frequency absorbing performance.