频率选择表面谐振特性在玻璃钢结构吸波材料中的应用研究

研究了频率选择表面(FSS)的谐振特性对玻璃钢(FRP)结构吸波材料吸波特性的补偿提高作用。为了提高FRP在8~11 GHz频段内的吸波特性,利用有限元法仿真设计了圆环孔径型以及双方环贴片型两种不同图形样式的FSS,并用自由空间法对其谐振特性进行了测试,最后利用FSS谐振特性对FRP在8~11 GHz频段内的吸波特性进行了补偿优化。结果表明,利用FSS在对应频段内的谐振特性,能够将FRP在8~11 GHz频段内的反射率全频段降至–10 dB以下,从而大幅度提高了FRP的雷达吸波特性。这为玻璃钢结构吸波材料的隐身化研究开辟了一条新的途径。

Application of the resonance characteristics of frequency selective surface in fiber reinforced plastic absorbing materials

In order to improve the microwave absorption performance of fiber reinforced plastic(FRP) absorbing material in a range of 8-11 GHz,a kind of circular loop aperture and a kind of double-square loop patch frequency selective surface(FSS) unite cells were designed using the finite element method(FEM),and the resonance characteristics of these two kinds of FSS were studied using the free space method.These two FSS were then incorporated in FRP absorbing materials,and the effects of the resonance characteristics of FSS on improving the absorption performance of FRP absorbing material were studied.The results indicate that,taking advantage of the resonance characteristics of FSS in corresponding bands,the reflectivity of FRP absorbing material is reduced to –10 dB below over the range of 9-11 GHz,namely,the absorption performance of FRP absorbing materials is significantly improved.This study provides a new way to improve the microwave absorption performance of FRP absorbing materials.