Ultra-wideband and Polarization-Insensitive Perfect Absorber Using Multilayer Metamaterials, Lumped Resistors, and Strong Coupling Effects.
Ultra-wideband and Polarization-Insensitive Perfect Absorber Using Multilayer Metamaterials, Lumped Resistors, and Strong Coupling Effects.
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使用多层超材料、集总电阻器和强耦合效应的超宽带和偏振不敏感完美吸收器。
DOI：
10.1186/s11671-018-2810-0
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发表时间：
2018-11-29
影响因子：
--
通讯作者：
Zhang Z
中科院分区：
文献类型：
--
作者：
Li SJ;Wu PX;Xu HX;Zhou YL;Cao XY;Han JF;Zhang C;Yang HH;Zhang Z
我们从理论和实验上提出了一种加载集总电阻的超宽带、薄理想异质材料吸波材料的新结构。该薄吸波材料由四层介质层、金属双分裂环谐振器(MDSRR)微结构和一组集总电阻组成。分析了超宽带吸收的机理，并对实现超宽带工作进行了参数研究。用角吸收光谱、近场强、表面电流分布、介电损耗和欧姆损耗等对材料的超宽带、极化不敏感和角免疫吸收特性进行了系统的表征。数值结果表明，在4.52~25.42 GHz(绝对带宽为20.9 GHz)范围内，超材料吸波材料获得了良好的吸波效果，吸收率大于80%，对应的带宽分数为139.6%。为了验证，使用普通印刷电路板方法实现了一种薄型超材料吸波材料，然后在微波暗室中进行了测量。数值计算结果与实验结果吻合较好，验证了理想的偏振不敏感的超宽带完全吸收。
We theoretically and experimentally proposed a new structure of ultra-wideband and thin perfect metamaterial absorber loaded with lumped resistances. The thin absorber was composed of four dielectric layers, the metallic double split ring resonators (MDSRR) microstructures and a set of lumped resistors. The mechanism of the ultra-wideband absorption was analyzed and parametric study was also carried out to achieve ultra-wideband operation. The features of ultra-wideband, polarization-insensitivity, and angle-immune absorption were systematically characterized by the angular absorption spectrum, the near electric-field, the surface current distributions and dielectric and ohmic losses. Numerical results show that the proposed metamaterial absorber achieved perfect absorption with absorptivity larger than 80% at the normal incidences within 4.52~25.42 GHz (an absolute bandwidth of 20.9GHz), corresponding to a fractional bandwidth of 139.6%. For verification, a thin metamaterial absorber was implemented using the common printed circuit board method and then measured in a microwave anechoic chamber. Numerical and experimental results agreed well with each other and verified the desired polarization-insensitive ultra-wideband perfect absorption.
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