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设计了一种三层宽频吸波超材料,其表层和中间层为单元尺寸不同的周期阵列结构,底层为吸波平板结构,优化后的总厚度仅为4.7 mm,并采用三维(3D)打印技术成功制备了该吸波超材料.吸波体反射率测试结果表明,在电磁波垂直入射条件下,宽频吸收峰分别出现在5.3和14.1 GHz,两峰叠加使得其在418 GHz频率范围内反射损耗均小于-10 dB.采用S参数反演法计算了每一层的等效电磁参数,并利用多层结构反射率公式推导得出该模型的理论反射率,理论计算结果与实测结果基本一致.通过研究能量损耗、电场分布和磁场分布揭示了吸波机理,分析表明该吸波体的宽频吸收效果源于三层结构产生的吸收带宽叠加.本文提出的吸波超材料具有良好的宽频吸收效果,尤其在低频范围吸波性能较佳,结合3D打印快速成型技术,可获得结构精细的三层吸波超材料,具有重要的实际应用价值和广阔的应用前景.In order to verify the feasibility of three-dimensional (3D) printing technology in preparing the metamaterial absorbers with complex structure, a three-layer broadband absorbing metamaterial is designed and fabricated by 3D printing technology. The surface layer and middle layer of the metamaterial are composed of periodic arrays with different unit dimensions and the bottom layer of a slab structure. The optimized thickness of the metamaterial is 4.7 mm. A composite absorbent which consists of carbonyl iron powder and nylon is used to fabricate the absorber. In experiment, the obtained absorber is vertically irradiated by an electromagnetic (EM) wave. Two strong absorption peaks at 5.3 GHz and 14.1 GHz are achieved, with the reflection losses of -15.1 dB and -12.5 dB, respectively. The superposition of the two absorption peaks results in a reflection loss below -10 dB in a range from 4 to 18 GHz. The effective EM parameters of the surface layer and the middle layer are calculated by the S parameter inversion method. An effective model of the three-layer structure absorber is proposed and its reflectivity is calculated by using a multilayer structure reflectivity formula. The calculated reflectivity agrees well with the measured one. The absorbing and resonance mechanisms of the two absorption peaks are investigated by analyzing the dynamic distributions of power density loss, electric field and magnetic field. It can be clearly confirmed that the reflection losses at 5.3 GHz and 14.1 GHz are primarily concentrated on the bottom layer and surface layer, and the broadband absorption performance can be derived from the superposition of broadband absorptions of the three absorbing layers. Meanwhile, the strong electric coupling effect between the adjacent units in the surface layer is demonstrated by analyzing the electric-field distributions, which indicates that the strong reflection loss at 14.1 GHz is mainly caused by the electric response. The multiple scattering effects among the three layers are also considered according to the magnetic field distributions at two resonance frequencies. It is shown that there are two magnetic responses at 5.3 GHz and 14.1 GHz, respectively, and the multiple scattering contributes to increasing the EM wave propagation distance and enhancing the power loss. The designed absorbing metamaterials in this paper achieve good broadband absorption performances, particularly in the low frequency band. Combined with 3D printing rapid technology, a promising route to constructing 3D absorbing metamaterials with complex structures is proposed, which would be of great significance and broad practical prospect.
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[22] Zhang S, Zhou J F, Park Y S, Rho J, Singh R, Nam S, Azad A K, Chen H T, Yin X, Taylor A J, Zhang X 2012 Nat. Commun. 3 942
[23] Zhu W M, Liu A Q, Zhang X M, Tsai D P, Bourouina T, Teng J H, Zhang X H, Guo H C, Tanoto H, Mei T, Lo G Q, Kwong D L 2011 Adv. Mater. 23 1792
[24] Xiong H 2014 Ph. D. Dissertation (Chengdu:University of Electronic Science and Technology of China) (in Chinese)[熊汉 2014博士学位论文 (成都:电子科技大学)]
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[29] Pan Y F 2005 M. S. Dissertation (Nanjing:Nanjing University of Aeronautics and Astronautics) (in Chinese)[潘琰峰 2005 硕士学位论文 (南京:南京航空航天大学)]
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[1] Hu C X 2004 Stealth Coating Technology (Beijing:Chemistry Industry Press) (in Chinese)[胡传炘 2004 隐身涂层技术 (北京:化学工业出版社)]
[2] Yuan J, Xiao G, Cao M S 2006 Mater. Des. 27 45
[3] Zhou L, Zhou W, Chen M, Luo F, Zhu D 2011 Mater. Sci. Eng. B 176 1456
[4] Kumar T A, Inayathullah J, Nagarajan V A, Kumar S H 2016 Bull. Mater. Sci. 39 279
[5] Choi I, Jin G K, Seo I S, Dai G L 2012 Compos. Struct. 94 3002
[6] Feng J, Zhang Y, Wang P, Fan H 2016 Compos. Part B:Eng. 99 465
[7] Bollen P, Quievy N, Detrtembleur C, Thomassin J M, Monnereau L, Bailly C, Huynen I, Pardoen T 2016 Mater. Des. 89 323
[8] Hosseini S H, Alamian A, Mousavi S M 2016 Fibers Polym. 17 593
[9] He P, Hou Z L, Zhang K L, Li J, Yin K, Feng S, Bi S 2017 J. Mater. Sci. 52 8258
[10] Rozanov K N 2000 IEEE Trans. Antennas Propag. 48 1230
[11] Song W L, Zhang K L, Chen M J, Hou Z L, Chen H S, Yuan X J, Ma Y B, Fang D N 2017 Carbon 118 86
[12] Zhou Q, Yin X W, Ye F, Liu X F, Cheng L F, Zhang L T 2017 Mater. Des. 123 46
[13] Yao B, Xia S X, Ou X H, Cheng C G 2016 Fiber Reinforced Plastics Composites 4 26 (in Chinese)[姚斌, 夏少旭, 欧湘慧, 程朝歌 2016 玻璃钢复合材料 4 26]
[14] Wang H, Kong P, Cheng W T, Bao W Z, Yu X W, Miao L, Jiang J J 2016 Sci. Rep. 6 23081
[15] Xu W H, He Y, Kong P, Li J L, Xu H B, Miao L, Bie S W, Jiang J J 2015 J. Appl. Phys. 118 1443
[16] Bhattacharyya S, Srivastava K V 2014 J. Appl. Phys. 115 4184
[17] Cheng Y Z, Nie Y, Wang X, Gong R Z 2014 J. Appl. Phys. 115 207492
[18] Wang Q, Tang X Z, Zhou D, Du Z J, Huang X Z 2017 IEEE Antennas Wirel. Propag. Lett. 16 3200
[19] D'Aloia A G, D'Amore M, Sarto M S 2016 IEEE Trans. Antennas Propag. 64 2527
[20] Costa F, Monorchio A, Manara G 2010 IEEE Trans. Antennas Propag. 58 1551
[21] Huang L, Chen H 2011 OALib Journal 113 103
[22] Zhang S, Zhou J F, Park Y S, Rho J, Singh R, Nam S, Azad A K, Chen H T, Yin X, Taylor A J, Zhang X 2012 Nat. Commun. 3 942
[23] Zhu W M, Liu A Q, Zhang X M, Tsai D P, Bourouina T, Teng J H, Zhang X H, Guo H C, Tanoto H, Mei T, Lo G Q, Kwong D L 2011 Adv. Mater. 23 1792
[24] Xiong H 2014 Ph. D. Dissertation (Chengdu:University of Electronic Science and Technology of China) (in Chinese)[熊汉 2014博士学位论文 (成都:电子科技大学)]
[25] Zhao Y C, Wan G B 2013 Chin. J. Radio. 28 2 (in Chinese)[赵雨辰,万国宾 2013 电波科学学报 28 2]
[26] Smith D R, Vier D C, Koschny T, Soukoulis C M 2005 Phys. Rev. E 71 036617
[27] Hickey M C, Akyurtlu A, Kussow A G 2010 Phys. Rev. A 82 11992
[28] Leon L S 2014 Encyclopedia of Thermal Stresses (Netherlands:Springer) p5267
[29] Pan Y F 2005 M. S. Dissertation (Nanjing:Nanjing University of Aeronautics and Astronautics) (in Chinese)[潘琰峰 2005 硕士学位论文 (南京:南京航空航天大学)]
[30] Li W, Wu T L, Wang W, Zhai P C, Guan J G 2014 J. Appl. Phys. 104 1189
[31] Zhou Q, Yin X W, Ye F, Liu X F, Cheng L F, Zhang L T 2017 Mater. Des. 123 46
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