基于超材料设计实现C/Co复合材料的超宽带吸收

Ultra-wideband absorption of C/Co composites achieved through metamaterial-based design

本文通过简单的一步热解法合成了C/Co复合材料,在材料质量填充浓度为35%时,观察到其具有优异的介电频散性能。当材料厚度2.5 mm时,该复合材料在11.2 GHz的最小反射率为-23.7 dB,小于-10 dB的带宽为3.8 GHz。为了进一步提高吸收体的吸波性能,利用全介质超材料的设计对吸收体的宏观结构进行优化,此方法成功地将小于-10 dB的吸收带宽扩展到15 GHz(7.0~22.0 GHz)。该研究结果可以为高性能微波吸收材料的制备工艺和结构设计提供有价值的参考。

We synthesized C/Co composites via a facile one-step pyrolysis procedure and observed excellent dielectric dispersion properties at a 35 wt%filling concentration.At a thickness of 2.5 mm,the composites exhibited a minimum reflection of-23.7 dB at 11.2 GHz,with a bandwidth of 3.8 GHz(RL≤-10 dB).To further improve their absorption performance,we optimized the macrostructure of the absorber using an all-dielectric metamaterial design.The optimized design successfully extended the less than-10 dB absorption bandwidth to 15 GHz(7.0~22.0 GHz).Our results provide a useful reference for optimizing the preparation technology and structural design of high-performance microwave absorbers.