Electromagnetic Properties of Nanometer SiC/CNTs Composite
Both the complex permittivity and permeability of nanometer SiC and nanometer SiC/CNTs composite were investigated by Hewlett-Packard 8510B Network Analyzer. The results show that the complex permittivity of nanometer SiC/CNTs composite is much higher than that of nanometer SiC. Reflection curves of nanometer SiC and nanometer SiC/CNTs composite calculated with electromagnetic wave transmission-line theory show that the addition of CNTs at 6 wt％, 12 wt％ and 18 wt％ in nanometer SiC absorber can improve its microwave absorption properties strongly. There is a relationship between the mass fraction of CNTs and microwave absorption ability. With increase of the mass fraction of CNTs, its microwave absorption ability firstly increased then decreased. From the simulation, it was found that nanometer SiC with 12 wt％ CNTs gave the optimum microwave absorption. The corresponding frequency of maximum reflection loss value of nanometer SiC/CNTs composite gradually moves to the low frequency range with increase of thickness. The maximum reflection loss value of nanometer SiC/CNTs composite (CNTs content is 12 wt％) was -25.74dB at the corresponding frequency of 11.60 GHz with a bandwidth under -5 dB (68％ absorption) is 7.16 GHz when the thickness is 2.0 mm.
SiC CNTs Electromagnetic parameters Microwave absorption properties
YAO Jianxun WANG Liuying LIU Gu HUA Shaochun
Xian Hi-Tech Research Institute, Xian 710025, China Xian Hi-Tech Research Institute, Xian 710025, China Key Laboratory of Electronic Ceramics and Devi
国际会议
青岛
英文
349-352
2009-10-09（万方平台首次上网日期，不代表论文的发表时间）