Broadband polarization-insensitive absorber based on gradient structure metamaterial

作者：Yang Guo Hui^*; Liu Xiao Xin; Lv Yue Long; Fu Jia Hui; Wu Qun; Gu Xuemai

来源：Journal of Applied Physics, 2014, 115(17): 17E523.

DOI：10.1063/1.4868090

Metamaterial absorber (MA) is a hot spot in the research on electromagnetic absorbers. In this paper, a metamaterial based broadband polarization-insensitive absorber is proposed. The absorber is fabricated with FR-4 dielectric substrate foiled with copper. The top layer of the unit cell of the MA is composed of resistors mounted crosswire and gradient split ring resonator (SRR) with a square metal patch (SMP) in it. The overall structure is symmetrical, which makes the MA polarization-insensitive. The gradient SRRs and SMPs resonate at adjacent frequencies resulting in broadband property. The absorption rates of the MA for TE and TM wave are calculated through the simulated S-parameters. The bandwidth is 9.9 GHz, where the absorption rate maintains 60% up to 98.28% in both cases and the relative bandwidth is 57.13%. Both broadband and polarization-insensitivity properties are achieved, which demonstrate promising application prospect of the proposed MA in shielding and stealth technology.

• 出版日期2014-5-7
• 单位哈尔滨工业大学