INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Tunable broadband metamaterial absorber consisting of ferrite slabs and a copper wire |
Yang Yong-Jun(杨拥军), Huang Yong-Jun(黄勇军)†, Wen Guang-Jun(文光俊), Zhong Jing-Ping(钟靖平), Sun Hai-Bin(孙海斌), and Oghenemuero Gordon |
Key Laboratory of Broadband Optical Fiber Transmission & Communication Networks, School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China |
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Abstract A tunable broadband metamaterial absorber is demonstrated at microwave frequencies in this paper. The metamaterial absorber is composed of ferrite slabs with large resonance beamwidths and a copper wire. The theoretical analysis for the effective media parameters is presented to show the mechanism for achieving the perfect absorptivity characteristic. The numerical results of transmission, reflectance, and absorptivity indicate that the metamaterial absorber exhibits a near perfect impedance-match to free space and a high absorptivity of 98.2% for one layer and 99.97% for two layers at 9.9 GHz. The bandwidth with the absorptivity above 90% is about 2.3 GHz. Moreover, the absorption band can be shifted linearly in a wide frequency range by adjusting the magnetic bias. This metamaterial absorber opens a way to prepare perfectly matched layers for engineering applications.
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Received: 21 October 2011
Revised: 16 November 2011
Accepted manuscript online:
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PACS:
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85.70.Ge
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(Ferrite and garnet devices)
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41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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42.25.Bs
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(Wave propagation, transmission and absorption)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60571024). |
Corresponding Authors:
Huang Yong-Jun,yongjunh@uestc.edu.cn
E-mail: yongjunh@uestc.edu.cn
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Cite this article:
Yang Yong-Jun(杨拥军), Huang Yong-Jun(黄勇军), Wen Guang-Jun(文光俊), Zhong Jing-Ping(钟靖平), Sun Hai-Bin(孙海斌), and Oghenemuero Gordon Tunable broadband metamaterial absorber consisting of ferrite slabs and a copper wire 2012 Chin. Phys. B 21 038501
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