摘要
研究了长度为1-2mm的活性碳纤维的介电特性。发现随频率的增大,介电常数的实部减小,虚部增大,具有频响效应。介电常数的实部和虚部均随复合材料中纤维质量百分含量的升高而增大。依据纤维的介电常数,通过阻抗匹配设计方法,优化设计两层和四层活性碳纤维吸波复合材料。根据优化结果制备了含有四个结构层的吸波复合材料,材料-10dB以下的频带宽度为8GHz,最大反射衰减-39.3dB。
Dielectric properties of activated carbon fibers （ACFs） with average length of 1 - 2mm were investigated. The results show that the real part of the microwave permittivity rises, but the imaginary part falls with an increase in frequency, which indicates ACFs have the frequency response effect. The real part and imaginary part increase with increasing the ACF mass percentage in the composite. According to the above measured data, the optimal design is carried out for double - layer and four - layer microwave absorbing materials based on the impedance matching design method. According to the optimization re- suits the four - layer absorbing material was prepared, and the band width with reflection loss below - lOdB is obtained over 8GHz and the minimum value of reflection loss reaches - 39.3dB.
出处
《功能材料与器件学报》
EI
CAS
CSCD
北大核心
2007年第1期54-58,共5页
Journal of Functional Materials and Devices
基金
天津市自然科学基金重点项目(No.013616911)
关键词
吸波材料
活性碳纤维
阻抗匹配设计
介电常数
反射衰减
microwave absorbing materials
activated carbon fibers
impedance matching design
microwave permittivity
reflection loss
