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角锥结构炭黑/水泥基复合材料的吸波性能研究

作者：李彬1，李仁林2，冀志江1，解帅1，王静1，周剑波1，朱连诚1

关键字：角锥,结构,炭黑,水泥,基,复合材料,的,吸波,

　
（1.中国建筑材料科学研究总院有限公司 绿色建筑材料国家重点实验室，北京  100024；
2.工程代建管理办公室，北京  100000）
    摘要：采用拱型反射率测试系统，研究了具有周期性角锥结构的炭黑/水泥基复合材料在1.7~18.0 GHz频段的电磁波吸收性能，讨论角锥尺度及材料基体对吸波性能的影响，利用HFSS软件对结果进行了仿真。结果表明，角锥结构可提高材料的吸波性能，角锥高度和炭黑掺量越大，吸波性能越好，且增大高度能使有效频带向低频段扩展，角锥高度40 mm，炭黑掺量1.5%时，实现99%吸收（< -20 dB）电磁波的频带（3.1~18.0 GHz）扩展到S波段（2~4 GHz）。角锥结构改善吸波性能的机理是角锥结构可形成与自由空间阻抗匹配和椎体间多重反射，从而增大干涉损耗和内部介电损耗，同时引入散射和衍射损耗。
    关键词：水泥基复合材料；角锥；吸波性能；电磁仿真
    中图分类号：TU525        文献标识码：A        文章编号：1001-702X（2020）06-0001-05
 
Electromagnetic wave absorbing properties of carbon black/cement-based materials with pyramidal structures
LI Bin1，Li Renlin2，JI Zhijiang1，XIE Shuai1，WANG Jing1，ZHOU Jianbo1，ZHU Liancheng1
（1.State Key Laboratory of Green Building Materials，China Building Materials Academy，Beijing 100024，China；
2.Engineering Construction Management Office，Beijing 100000，China）
    Abstract：Cement-based composites with periodic pyramidal surfaces were prepared，and its electromagnetic wave absorbing properties were measured with arch reflectivity test system in 1.7~18.0 GHz. The influence of the pyramid size and the matrix on the absorbing properties was discussed. The results were simulated with the software HFSS. The results showed the pyramidal structure improved the absorbing properties. Larger heights and electromagnetic parameters make better absorption properties. The absorption properties in lower frequency range were enhanced by larger scale in height，and the absorbing frequency band reached S band（2~4 GHz） as height increased. The reflectivity was better than -20 dB in 3.1~18.0 GHz when the pyramid height and carbon black content were 40 mm and 1.5%，respectively. The mechanism of the pyramid structure to improve the absorbing performance is that the pyramid structure can form impedance matching with free space and multiple reflections enhanced the attenuation，thereby increasing interference loss and internal dielectric loss，and introducing scattering and diffraction losses.
    Key words：cement-based composite，pyramidal，absorbing properties，electromagnetic simulation