摘要
提出了一种耐高温的宽带吸波超材料的设计和制备方法,得到了在整个X波段均具有90%以上宽带吸收率、可在室温到400℃工作的吸波超材料。该超材料结构由上层石墨电阻膜方片单元,底层石墨反射层以及中间氧化铝介质层构成,结构参数经过有限元模拟优化得到,通过丝网印刷法制备完成。实测与模拟吸收性能吻合良好,且在不同温度下能保持稳定的吸收性能。超材料的宽带强吸收源于磁共振机制带来的宽带阻抗匹配,以发生在电阻膜层的欧姆损耗为主。得益于磁共振机制,其吸波性能保持了较好的稳定性。与传统耐高温吸波超材料相比,该耐高温吸波超材料具有频带宽、吸收强、厚度薄、制备便捷、温度适应性好等特点,有望运用于高温吸波隐身及电磁兼容等领域。
A high temperature metamaterial microwave absorber with strong absorption of over 90%in the whole X-band from room temperature to 400℃is designed and fabricated.The metamaterial structure which consists of the upper layer of graphite Ohmic sheet unit cells,bottom graphite reflection layer and the middle alumina dielectric layer,is feasibly prepared by screen printing.The finite element simulation analysis shows that the absorption performance of metamaterial absorber is due to the magnetic resonance mechanism and the loss of electromagnetic wave is dominated by Ohmic loss.The measured absorption is in good agreement with the simulated result and keeps stable values at varying temperatures thanks to the magnetic resonance mechanism.Compared with traditional high-temperature microwave absorber,the high-temperature metamaterial microwave absorber has the advantages of wide bandwidth,strong absorption,thin thickness and convenient preparation and is expected to be used in the fields of stealth and electromagnetic compatibility.
作者
李玉坤
许志远
曹洁
李维
官建国
LI Yu-kun(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)
出处
《武汉理工大学学报》
CAS
北大核心
2018年第8期1-7,共7页
Journal of Wuhan University of Technology
基金
国家自然科学基金面上项目(51577138).
关键词
超材料
吸波材料
耐高温吸波
宽带吸波性能
metamaterial
microwave absorber
high-temperature microwave absorption
broadband absorption
