宽频带超材料微波吸收结构研究

doi:10.13232/j.cnki.jnju.2019.03.015

南京大学学报(自然科学版) ›› 2019, Vol. 55 ›› Issue (3): 478–485.doi: 10.13232/j.cnki.jnju.2019.03.015

宽频带超材料微波吸收结构研究

朱　逸，李　歌，唐东明，张豹山，杨　燚*

南京大学电子科学与工程学院，南京，210023

收稿日期:2019-01-25 出版日期:2019-06-01 发布日期:2019-05-31
通讯作者: 杨　燚 E-mail:malab@nju.edu.cn
基金资助:
国家自然科学基金(61271077，11004095，11104134)

Study on broadband metamaterial microwave absorber

Zhu Yi，Li Ge，Tang Dongming，Zhang Baoshan，Yang Yi*

School of Electronic Science and Engineering，Nanjing University，Nanjing，210023，China

Received:2019-01-25 Online:2019-06-01 Published:2019-05-31
Contact: Yang Yi E-mail:malab@nju.edu.cn

摘要/Abstract

摘要： 将3D超材料吸波结构和磁性吸波材料相结合使用，对宽频带微波超材料吸收结构进行了设计优化和电磁场仿真研究. 利用磁性材料本身的电磁波吸收性能和周期性超材料吸波单元的频率可设计性，并充分考虑了3D渐变单元的电磁场匹配和多次反射吸收的情况，设计了由圆台形单元组成的周期性吸波结构：每个圆台由20层尺寸渐变的金属谐振单元和以羰基铁粉为吸波填充材料的磁性复合层相间堆叠而成. 采用电磁仿真软件CST Microwave Studio进行了结构设计以及吸波效果和电磁场分析，结果表明：此结构在4.5 G～18 GHz频率范围内电磁波吸收效果较好，正入射的吸收率大于90%. 仿真和分析结果也表明，吸波材料和超材料相结合，在厚度不超过5 mm的情况下，所能够实现的吸波频率的下限约为4 GHz.

关键词: 超材料, 吸波材料, 超宽频, 羰基铁粉, 电磁仿真

Abstract: In this paper，the optimization of one kind of ultra－broadband metamaterial microwave absorber has been carried out by electromagnetic field simulation and theoretical analysis，combining 3D metamaterial absorbing structure with traditional magnetic material. Making full use of the electromagnetic wave absorption of the magnetic material and the frequency designability of the periodic metamaterial structure，and taking account of the impedance matching，multiple reflection and absorption of the electromagnetic field of the 3D gradient unit，a periodic absorbing structure which consists of frustums of a cone is designed. Each frustum consists of 20 layers of metal resonant sheets with the size linearly enlarged and 20 layers of magnetic complex filled with carbonyl iron powder. The two kinds of layers are stacked one another，and the whole bottom is set as a perfect metal reflect layer. The electromagnetic simulation software CST Microwave Studio 2010 is used to design the structure，calculate the absorbing effect and analyze the distribution of electromagnetic field of the absorbing structure.After the optimization of the relevant parameters，the final simulation results show that the structure has an effective absorption in the frequency range of 4.5 G～18 GHz，and the absorption rate of normal incidence is more than 90%. The analysis and simulation results also show that when the thickness of absorbing material is not more than 5 mm，the lower limit of absorbing frequency can be achieved by combining magnetic material with metamaterial，which is about 4 GHz. As a result，it is difficult to further broaden the absorption band to the range of low frequency，such as L，S band and lower frequencies，which poses more challenges to the related research in the future.

Key words: metamaterial, microwave absorber, ultra－broadband, carbonyl iron powder, electromagnetic simulation

中图分类号:

TB333

朱　逸，李　歌，唐东明，张豹山，杨　燚. 宽频带超材料微波吸收结构研究[J]. 南京大学学报(自然科学版), 2019, 55(3): 478–485.

Zhu Yi，Li Ge，Tang Dongming，Zhang Baoshan，Yang Yi. Study on broadband metamaterial microwave absorber[J]. Journal of Nanjing University(Natural Sciences), 2019, 55(3): 478–485.

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宽频带超材料微波吸收结构研究

Study on broadband metamaterial microwave absorber

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