【作者】 朱红； 林海燕； 郭洪范； 於留芳； 魏永生；

【Author】 ZHU Hong, LIN Hai-yan, GUO Hong-fan, YU Liu-fang, WEI Yong-sheng (School of Science, Beijing Jiaotong University, Beijing 100044, China)

【机构】 北京交通大学理学院；

【摘要】 通过湿化学技术法制备了Co充填碳纳米管复合材料。HP8722ES矢量网络分析仪测量了样品在2- 18GHz频率范围内的复介电常数(εr=ε’-jε”)和复磁导率(μr=μ’-jμ”)．材料反射率损耗(R．L．)、匹配频段 (fm)及匹配厚度(dm)采用吸收屏理论公式计算。结果表明,样品反射率随吸收层匹配厚度的增大,吸收峰向低频方向迁移．吸收层在Ku波段具有较好的吸波效果。当吸收层匹配厚度为dm=3．0mm时,在13．8-17．8 GHz中高频范围内,反射衰减最大达-39．32dB,反射衰减<-10dB的频宽达4．0GHz．更多还原

【Abstract】 Co-filled carbon nanotubes composites were synthesized through using a simple and efficient route without causing a significant modification of the energy states of the multi-walled carbon nanotubes. The samples were characterized by transmission electron microscopy. The complex relative permittivity (εr=ε’ - j ε") and permeability (μr = μ’ -j μ") of the absorber were measured in a frequency range of 2-18 GHz. The reflection loss (R.L.), matching frequency (fm) and matching thickness (dm) were calculated using the theory of the absorbing wall. The electromagnetic properties and microwave-absorbing characteristics effects by the encapsulation of metal Co in the carbon nanotubes were investigated. A matching thickness is found corresponding to a matching frequency. The maximum reflection loss is about -39.32dB and the bandwidth corresponding to the reflection loss below -10 dB is more than 3.47GHz. With increasing thickness, the maximum reflection coefficient shifts to lower frequency.更多还原