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Chin. Phys. B, 2014, Vol. 23(6): 067801    DOI: 10.1088/1674-1056/23/6/067801
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Design of a varactor-tunable metamaterial absorber

Lin Bao-Qin (林宝勤), Da Xin-Yu (达新宇), Zhao Shang-Hong (赵尚弘), Meng Wen (蒙文), Li Fan (李凡), Fang Ying-Wu (方英武), Wang Jia-Fu (王甲富)
Institute of Information and Navigation, Air Force Engineering University, Xi'an 710077, China
Abstract  In this paper, we design a varactor-tunable metamaterial absorber (MA). The tunable MA is based on a mushroom-type high impedance surface (HIS), in which varactors are loaded between adjacent metal patches to adjust the capacitance and tune the resonance frequency, the primary ground plane is etched as the bias network to bias all of the varactors in parallel, and another ultra-thin grounded film is attached to the bottom. Its absorption characteristics are realized for electrically dielectric loss. The simulated values of a sample indicate that a tunable frequency range from 2.85 GHz to 2.22 GHz is achieved by adjusting the varactor capacitance from 0.1 pF to 2.0 pF, and better than 0.97 absorbance is realized; in addition, the tunable frequency range is expanded from 4.12 GHz to 1.70 GHz after optimization.
Keywords:  metamaterial absorber (MA)      high impedance surfaces (HISs)      varactor  
Received:  06 October 2013      Revised:  21 December 2013      Accepted manuscript online: 
PACS:  78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))  
  42.25.Bs (Wave propagation, transmission and absorption)  
Fund: Project supported by the National Natural Science Foundations of China (Grant Nos. 61271250 and 11204378).
Corresponding Authors:  Lin Bao-Qin     E-mail:  aflbq@sina.com

Cite this article: 

Lin Bao-Qin (林宝勤), Da Xin-Yu (达新宇), Zhao Shang-Hong (赵尚弘), Meng Wen (蒙文), Li Fan (李凡), Fang Ying-Wu (方英武), Wang Jia-Fu (王甲富) Design of a varactor-tunable metamaterial absorber 2014 Chin. Phys. B 23 067801

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