We present the design and measurement of broadband magnetic composite metamaterial absorber with C-Band absorbing effect. The absorber embeds the periodic array of concentric semicircular copper sheet in the FeSiAl_p/epoxy composite material layer. The wave-absorbing properties of the FeSiAl_p/epoxy resin composite is greatly improved compared with the simple FR4 matrix material, bandwidth with reflectance less than -10dB increases from 0 GHz to 8.13 GHz. Simultaneously, due to the introduction of the frequency selective surface (FSS) structure, the absorber performance of the absorber is also improved in C-band. The peak of the absorber appears at 7.46GHz, and the reflectivity reaches -12.78dB, and the absorption reaches 94.72%. After optimizing the dimensions of FSS, The FeSiAlp/epoxy resin composite absorber with a thickness of 2.6mm reached peak simultaneously at 7.46GHz and 16.64GHz, and peak reflectance reach -12.78dB and -18.21dB, respectively, and corresponding absorption reached 95.68% and 99.70%, respectively. Bandwidths with reflectivity less than -10dB reaches 8.13GHz, the absorber has obvious absorption effect in C-band. The experiment basically verified the simulation results. Hence, the absorber with special structure design not only overcomes the problem of narrow absorption band of metamaterials, but also solves the shortcoming of weak C-band absorption effect of magnetic material absorber.

我们提出了具有C波段吸收作用的宽带磁性复合超材料吸收器的设计和测量。吸收体嵌入同心半圆的铜片在FeSiAl所述周期性阵列_p /环氧复合材料层。FeSiAl _p的吸波特性与简单的FR4基体材料相比，β-环氧树脂复合材料得到了极大的改进，反射率小于-10dB的带宽从0 GHz增加到8.13 GHz。同时，由于引入了频率选择表面（FSS）结构，吸收器的吸收器性能在C波段也得到了改善。吸收峰出现在7.46GHz，反射率达到-12.78dB，吸收率达到94.72％。优化FSS尺寸后，厚度为2.6mm的FeSiAlp /环氧树脂复合吸收体在7.46GHz和16.64GHz处同时达到峰值，峰值反射率分别达到-12.78dB和-18.21dB，相应的吸收率达到95.68％。和99.70％。反射率小于-10dB的带宽达到8.13GHz，吸收体在C波段具有明显的吸收作用。实验基本验证了仿真结果。因此，具有特殊结构设计的吸收器，不仅克服了超材料吸收带窄的问题，而且解决了磁性材料吸收器的C带吸收效果弱的缺点。