宽带
材料科学
超材料
阻抗匹配
吸收(声学)
微波食品加热
氧化铟锡
光学
横截面
电阻抗
光电子学
电气工程
电信
物理
薄膜
工程类
纳米技术
复合材料
结构工程
作者
Yanzhao Wang,Chaohui Wang,Yuefeng Zhai,Fan Zhang,Huiling Luo,Tong Liu,Guangwei Hu,He‐Xiu Xu
标识
DOI:10.1016/j.matdes.2023.112397
摘要
The rapid development of metamaterials offers a new avenue to achieve exotic electromagnetic properties, such as perfect absorption for important stealth engineering applications. So far, there are few demonstrations of wide-angle broadband absorption, due to the stringent impedance matching requirement. Here, inspired by the concept of log-periodic dipole antenna (LPDA) for broadband emission, we propose a wide-angle broadband absorption based on both indium tin oxide (ITO) material and judiciously engineered metapyramid geometry. The strip ITO arrays on the sidewalls of metapyramid follow the quasi-LPDA strategy for gradient impedance and expands significantly both angular and spectral operating bandwidth by a cascading of multiple electric and magnetic resonances, as revealed by the rigorous characteristic mode analysis. Our experimental results show that the exotic absorption reaches above 0.9 at 45° tilted incidence for both transverse electric and transverse magnetic polarizations across the band of 8∼18 GHz. Our strategy circumvents the issues of limited-angle operation, high costs and high weight raised by metal structures, providing a new paradigm toward wide-angle broadband metadevices.
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