High-Impedance Surface-Based Broadband Absorbers With Interference Theory
High-Impedance Surface-Based Broadband Absorbers With Interference Theory
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DOI：
10.1109/tap.2015.2459138
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发表时间：
2015-10-01
影响因子：
5.7
通讯作者：
Liu, Minghai
中科院分区：
文献类型：
--
作者：
Chen, Junfeng;Hu, Zhaoyang;Liu, Minghai
提出了一种基于八角形环形电阻贴片的宽带极化不敏感高阻抗表面超材料吸波体。理论，实验和模拟的吸收器进行了研究。模拟结果表明，该结构在3.65 ~ 13.93 GHz范围内获得了10.28 GHz的宽带吸收，垂直入射时吸收率大于90%。实验结果与仿真结果基本一致。给出了该结构的电磁场分布和表面功率损耗密度图，分析了该结构的吸波机理。对不同表面电阻和衬底厚度的吸收体的吸收率的进一步模拟表明，存在最佳值的设计。研究了偏振不敏感特性和斜入射下的特性。最后，利用干涉理论分析和解释了垂直入射和斜入射下的宽带吸收机制。计算结果与模拟结果吻合较好。因此，仿真和实验结果验证了理论分析方法的正确性。
A broadband and polarization-insensitive high-impedance surface (HIS) metamaterial absorber (MA) based on octagonal ring-shaped resistive patches is presented. The absorber is investigated theoretically, experimentally, and by simulation. The simulated results indicate that this structure obtains 10.28 GHz wide absorption from 3.65 to 13.93 GHz with absorptivity larger than 90% at the normal incidence. Experimental results are in accordance with those of the simulation results. The electromagnetic (EM) field distributions and the plots of surface power loss density have been illustrated to analyze the absorption mechanism of the structure. Further simulations of the absorptivity of the proposed absorber with different surface resistances and substrate thicknesses indicate that there exist optimal values for the design. The polarization-insensitive feature and the properties under oblique incidence are also investigated. Finally, the interference theory is introduced to analyze and interpret the broadband absorption mechanism at both normal and oblique incidences. The calculated absorption rates of the proposed absorber coincide well with the simulated results. Therefore, the simulated and experimental results verify the validity of the theoretically analytical method for this type of broadband absorber.