南京大学学报(自然科学版) ›› 2019, Vol. 55 ›› Issue (3): 470477.doi: 10.13232/j.cnki.jnju.2019.03.014
李 歌,朱 逸,过勐超,唐东明,张豹山,杨 燚*
Li Ge,Zhu Yi,Guo Mengchao,Tang Dongming,Zhang Baoshan,Yang Yi*
摘要: 介绍一种在两层磁性材料之间嵌入频率选择表面的薄层复合吸波结构的宽带吸收特性. 频率选择表面由金属方环阵列和低耗介质板构成,其上层、下层磁性材料为不同电磁参数的羰基铁复合物. 不加频率选择表面的传统磁性吸波材料若想在宽带取得良好的吸收效果,需要较大的厚度和面密度,导致其应用范围受限. 引入频率选择表面能够增强复合吸波结构的吸收频带,并有效减薄吸波结构的厚度. 在阻抗匹配条件下,电磁能量主要通过金属单元的欧姆损耗和底层磁性材料的磁损耗进行吸收. 为了验证该复合吸波体的吸波性能,在电磁仿真软件HFSS 15.0上搭建模型,而后根据仿真结果对结构参数不断进行优化. 最终的仿真结果表明,复合吸波材料厚度为2 mm,2 GHz处反射率可达-5.5 dB,在3.4 G~9 GHz频段反射率为-10 dB,在9 G~18 GHz频段反射率依旧达到-8 dB以下. 而无频率选择表面的复合吸波材料,在同等条件下,虽然峰值吸收率较大,但在12 GHz以上吸波性能快速恶化,难以满足宽带吸波的要求. 因此,含频率选择表面的复合吸波体具有吸收频带宽的优势,具有广泛的应用前景.
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