Nguyen Toan Trung, Lim Sungjoon
School of Electrical and Electronics Engineering, Chung-Ang University, Heukseok-Dong, Dongjak-Gu, Seoul, 06974, Republic of Korea.
Sci Rep. 2018 Apr 26;8(1):6633. doi: 10.1038/s41598-018-25074-8.
In this paper, a broadband metamaterial (MM) absorber is presented for X-band applications. A novel eight-resistive-arm (ERA) cell is proposed as an MM unit cell to achieve both broadband absorption and wide incidence angles. The proposed ERA cell is designed using equivalent circuit model and full-wave analysis in order to achieve an absorption ratio higher than 90% in the range of 8.2-13.4 GHz. The experimental results indicate that the absorptivity was greater than 90% in the range of 8-13 GHz for all polarization angles under normal incidence. Under oblique incidence, the measured absorptivity was greater than 90% in the range of 8.2-12.2 GHz up to 60° and in the range of 9.2-12 GHz up to 65° in the transverse electric (TE) mode. In the transverse magnetic (TM) mode, the measured absorptivity was higher than 90% in the range of 9.5-12.4 GHz when the incidence angle was varied from 0° to 60° and remaining a 90% absorption bandwidth in the range of 10-12 GHz up to 65°. Compared to other broadband MM absorbers, the proposed MM absorber exhibited the widest incidence angles in both TE and TM modes.
本文提出了一种用于X波段应用的宽带超材料（MM）吸收体。提出了一种新颖的八电阻臂（ERA）单元作为MM单元，以实现宽带吸收和宽入射角。所提出的ERA单元采用等效电路模型和全波分析进行设计，以便在8.2 - 13.4 GHz范围内实现高于90%的吸收率。实验结果表明，在垂直入射下，所有极化角度在8 - 13 GHz范围内吸收率均大于90%。在斜入射下，在横向电（TE）模式中，测量的吸收率在8.2 - 12.2 GHz范围内高达60°时大于90%，在9.2 - 12 GHz范围内高达65°时大于90%。在横向磁（TM）模式中，当入射角从0°变化到60°时，测量的吸收率在9.5 - 12.4 GHz范围内高于90%，在高达65°时在10 - 12 GHz范围内保持90%的吸收带宽。与其他宽带MM吸收体相比，所提出的MM吸收体在TE和TM模式中均表现出最宽的入射角。
