摘要
基于闭合双环单元结构,设计、仿真、测试了对偏振无依赖性的双波段超材料吸收器.实验结果表明,该设计在频率4.06 GHz和6.66 GHz存在两个显著吸收峰,吸收率分别为99.60%和95.83%,并且在入射角达到50°时,吸收率仍然保持在83%以上.由于单元结构具有旋转对称性,使得该吸收器对偏振不敏感,能同时实现横电波和横磁波的双波段吸收.吸收频率决定于闭合环大小,调节闭合环尺寸能够灵活实现特定频率的吸收.这些优点使我们的设计在多频谱成像、热辐射探测等应用中表现出较大的潜力.
We report on the design, the fabrication and the measurement of a microwave dual band absorber in microwave regime. The single unit cell consists of two closed ring resonators and a metallic ground plane separated by an FR4 layer. Experimental results show that the absorber has two distinctive absorption peaks at frequencies 4.06 GHz and 6.66 GHz with absorptions 99.60% and 95.83%, respectively, and the absorptivity drops in a wide range of incident angle. Fourfold rotational symmetry of the geometry makes the absorber insensitive to transverse electric and transverse magnetic polarization. The dual band absorber is a promising candidate as absorbing elements in multi-frequency imaging and thermal detection, due to its multi-band absorption performance, polarization- insensitivity, and wide angle of incidence.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第5期467-471,共5页
Acta Physica Sinica
基金
国家自然科学基金(批准号:60990320
60990324
60871016
60901011)
中国矿业大学科技基金(批准号:2007A031)
江苏省研究生创新基金(批准号:CX09B_045Z)资助的课题~~
关键词
超材料
吸收器
metamaterial, absorber
