Cheng Yong Zhi, Cheng Zheng Ze, Mao Xue Song, Gong Rong Zhou
School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China.
School of Electronic and Information Engineering, Hubei University of Science and Technology, Xianning 437100, China.
Materials (Basel). 2017 Oct 27;10(11):1241. doi: 10.3390/ma10111241.
We design an ultra-thin multi-band polarization-insensitive metamaterial absorber (MMA) using a single circular sector resonator (CSR) structure in the microwave region. Simulated results show that the proposed MMA has three distinctive absorption peaks at 3.35 GHz, 8.65 GHz, and 12.44 GHz, with absorbance of 98.8%, 99.7%, and 98.3%, respectively, which agree well with an experiment. Simulated surface current distributions of the unit-cell structure reveal that the triple-band absorption mainly originates from multiple-harmonic magnetic resonance. The proposed triple-band MMA can remain at a high absorption level for all polarization of both transverse-electric (TE) and transverse-magnetic (TM) modes under normal incidence. Moreover, by further optimizing the geometric parameters of the CSRs, four-band and five-band MMAs can also be obtained. Thus, our design will have potential application in detection, sensing, and stealth technology.
我们在微波区域使用单个扇形谐振器（CSR）结构设计了一种超薄多频段偏振不敏感超材料吸收器（MMA）。模拟结果表明，所提出的MMA在3.35 GHz、8.65 GHz和12.44 GHz处有三个明显的吸收峰，吸收率分别为98.8%、99.7%和98.3%，与实验结果吻合良好。对单元结构的模拟表面电流分布表明，三频段吸收主要源于多谐波磁共振。所提出的三频段MMA在垂直入射下对横向电场（TE）和横向磁场（TM）模式的所有偏振都能保持在高吸收水平。此外，通过进一步优化CSR的几何参数，还可以获得四频段和五频段的MMA。因此，我们的设计将在检测、传感和隐身技术方面具有潜在应用。
