Design of a varactor-tunable metamaterial absorber

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...

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Bibliographic Details
Published in:Chinese physics B 2014-06, Vol.23 (6), p.542-546, Article 67801
Main Author: 林宝勤 达新宇 赵尚弘 蒙文 李凡 方英武 王甲富
Format: Article
Language:English
Subjects:
Adjustment
Bias
Capacitance
Frequency ranges
GHz
Ground plane
High impedance
Metamaterials
Varactors
变容二极管
可调谐
吸收器
材料
电介质损耗
设计
频率范围
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Summary: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.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/23/6/067801