Incident Angle- and Polarization-Insensitive Metamaterial Absorber using Circular Sectors.
Incident Angle- and Polarization-Insensitive Metamaterial Absorber using Circular Sectors.
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DOI：
10.1038/srep27155
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发表时间：
2016-06-03
影响因子：
4.6
通讯作者：
Lim S
中科院分区：
文献类型：
--
作者：
Lee D;Hwang JG;Lim D;Hara T;Lim S
本文提出了一种对入射角和偏振不敏感的超材料吸收体，用于x波段。所提出的吸收体的单元格在中心有一个方形块，四个圆形扇区围绕方形块旋转。单晶胞的垂直和水平对称结构使偏振不敏感成为可能。单晶胞的圆形扇形可以实现角度不敏感。通过全波仿真和实测验证了该吸收器的性能。研究了圆扇形在不同内角下的角灵敏度。当圆扇形内角为90°时，模拟吸收率大于90%，入射角为70°时，频率变化小于0.96%。在10.44 GHz处，所有偏振角的吸光率均接近100%。当入射角度在0°~ 60°范围内变化时，横向电（TE）和横向磁（TM）模式的测量吸收率均保持在90%以上。
In this paper, an incident angle- and polarization-insensitive metamaterial absorber is proposed for X-band applications. A unit cell of the proposed absorber has a square patch at the centre and four circular sectors are rotated around the square patch. The vertically and horizontally symmetric structure of the unit cell enables polarization-insensitivity. The circular sector of the unit cell enables an angle-insensitivity. The performances of the proposed absorber are demonstrated with a full-wave simulation and measurements. The angular sensitivity is studied at different inner angles of the circular sector. When the inner angle of the circular sector is 90°, the simulated absorptivity is higher than 90%, and the frequency variation is less than 0.96% for incident angles up to 70°. The measured absorptivity at 10.44 GHz is close to 100% for all the polarization angles under normal incidence. When the incident angles are varied from 0°– 60°, the measured absorptivity is maintained above 90% for both the transverse electric (TE) and the transverse magnetic (TM) modes.