Ultra-wideband absorption of C/Co composites achieved through metamaterial-based design
We synthesized C/Co composites via a facile one-step pyrolysis procedure and observed excellent di-electric dispersion properties at a 35 wt%filling concentration.At a thickness of 2.5 mm,the composites exhibit-ed a minimum reflection of-23.7 dB at 11.2 GHz,with a bandwidth of 3.8 GHz(RL≤-10 dB).To further im-prove their absorption performance,we optimized the macrostructure of the absorber using an all-dielectric meta-material 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.
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