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设计和制备了含螺旋单元频率选择表面吸波片的三层复合吸波体,上层和下层均为磁性吸波片,中间层为带缺口的螺旋单元频率选择表面.复合吸波体在总厚度分别为1.4,1.7和2.0 mm时,其反射率在-10d B以下的频带宽度分别达到了9.29,6.69和7.11 GHz,与不含有频率选择表面的吸波体相比较(其他参数相同),-10d B以下反射率带宽分别提高了159.5%,69.3%和129.4%,复合吸波体在总厚度低于吸波体时,也取得了更好的反射效果.带缺口圆螺旋单元的频率选择表面嵌入吸波体中,引入了额外的吸收频带,拓宽了吸波体的反射率频带宽度.仿真分析表明嵌入频率选择表面能够改善吸波体的阻抗匹配性,进而影响其反射率.
A three-layer composite absorber with helical element frequency selective surface absorber was designed and prepared, the upper and lower layers were both magnetic absorbers, and the middle layer was a helical cell frequency selective surface with a notch. At 1.4, 1.7 and 2.0 mm respectively, the bandwidths of reflectivity below -10d B reach 9.29,6.69 and 7.11 GHz, respectively, compared with wave absorbers without the frequency selective surface (other parameters are the same) The reflectivity bandwidth under 10d B increased by 159.5%, 69.3% and 129.4%, respectively, and the composite absorber also achieved a better reflection when the total thickness was lower than that of the absorber. The frequency selective surface with notched circular helix The absorption band is introduced into the absorber, which broadens the bandwidth of the reflectance of the absorber.The simulation results show that the frequency selective surface can improve the impedance matching of the absorber and affect its reflectivity.