A frequency and bandwidth tunable metamaterial absorber in x-band
A frequency and bandwidth tunable metamaterial absorber in x-band
复制标题
X波段频率和带宽可调谐超材料吸收器
DOI：
10.1063/1.4919753
复制
发表时间：
2015
影响因子：
3.2
通讯作者：
Feng Y.
中科院分区：
文献类型：
--
作者：
Yuan H.;Zhu B. O.;Feng Y.
智能控制是现代电磁波吸收器的一个重要功能。本文介绍了一种X波段频率和带宽可调的超材料吸收体的设计、制作和测量。MA的单元格由加载有变容二极管的微带谐振器组成。仿真和测量结果表明，通过调节变容管的偏置电压，可以将峰值吸收频率调谐0.44 GHz，峰值吸收率大于95%。通过场路模型分析，揭示了其工作模式，预测了其吸波频率。之后，通过专门设计的偏置电路，以便分别调整相邻单元电池上的偏置电压，产生双谐振和吸收峰，并且因此可以通过控制两个谐振频率的差来方便地调谐总吸收带宽。中心吸收频率也可以调谐。仿真和实验结果表明，75%吸收（−6 dB反射）带宽可以在0.40 GHz至0.74 GHz范围内调谐，这是一个两倍的调谐范围。这项工作被认为是改善国家的最先进的智能超材料吸收。
Smart control is an attracting and important function for modern electromagnetic wave absorber. This paper presents the design, fabrication, and measurement of a frequency and bandwidth tunable metamaterial absorber (MA) in X-band. The unit cell of the MA consists of a microstrip resonator loaded with the varactors. Simulation and measurement results show that by tuning the bias voltage on the varactors, the peak absorption frequency can be tuned by 0.44 GHz with the peak absorption greater than 95%. Field and circuit model analysis is conducted to reveal the working mode and predict the absorbing frequency. After that, by specially designing the bias circuit so as to adjust the bias voltage on neighboring unit cells separately, dual resonance and absorption peaks occur, and the overall absorption bandwidth can thus be tuned conveniently by controlling the difference of the two resonance frequencies. The center absorbing frequency can also be tuned. Simulation and experiment results show that the 75% absorption (−6 dB reflection) bandwidth can be tuned from 0.40 GHz to 0.74 GHz, which is a two-fold tuning range. This work is believed to improve the state-of-the-art smart metamaterial absorber.