碳纳米管／电介质双层吸波涂层衰减特性分析

Attenuation of Double-layer Type Microwave Absorber Made of Carbon Nanotubes-dielectric Composite Material

测试了两种碳管复合材料的C1波段电磁参数。结果显示碳管复合材料具有较高的介电损耗。在S,C1频段,单层碳管涂层的吸波频带窄。运用传输线理论分析两种直径碳管复合材料与不同材料组成双层涂层的反射率变化。结果表明:采用碳管涂层为面层,低介电常数、高本征阻抗材料为底层的双层涂层设计,可以提高碳管涂层的低频吸波能力。

Electromagnetic parameters （EMP） of range C1 band, which had two different diameters carbon nanotubes （CNTs） were measured at the of 10-20nm and 40-60nm,respectively. The results show that CNTs composites have high dielectric loss. The single-layer CNTs coating has narrow width of absorbing characteristic at S, C1 band. The results indicate that the double-layer type ab- sorber may improve the absorbing property of the CNTs composites at C1 band, which made of surface layer of CNTs coating, bottom layer of dielectric composites with low dielectric constant, high intrinsic impedance.