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Low-frequency and broadband metamaterial absorber based on lumped elements: design, characterization and experiment

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Abstract

In this paper, we propose and experimentally validate a low-frequency metamaterial absorber (MMA) based on lumped elements with broadband stronger absorptivity in the microwave regime. Compared with the electric resonator structure MMA, the composite MMA (CMMA) loaded with lumped elements has stronger absorptivity and nearly impedance-matched to the free space in a broadband frequency range. The simulated voltage in lumped elements and the absorbance under different substrate loss conditions indicate that incident electromagnetic wave energy is mainly transformed to electric energy in the absorption band with high efficiency and subsequently consumed by lumped resistors. Simulated surface current and power loss density distributions further clarify the mechanism underlying observed absorption. The CMMA also shows a polarization-insensitive and wide-angle strong absorption. Finally, we fabricate and measure the MMA and CMMA samples. The CMMA yields below −10 dB reflectance from 2.85 to 5.31 GHz in the experiment, and the relative bandwidth is about 60.3 %. This low-frequency microwave absorber has potential applications in many martial fields.

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Authors and Affiliations

  1. School of Information and Electrical Engineering, Hebei University of Engineering, Handan, 056038, China

    Wenshan Yuan

  2. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China

    Yongzhi Cheng

Authors
  1. Wenshan Yuan
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  2. Yongzhi Cheng
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Correspondence to Yongzhi Cheng.

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Yuan, W., Cheng, Y. Low-frequency and broadband metamaterial absorber based on lumped elements: design, characterization and experiment. Appl. Phys. A 117, 1915–1921 (2014). https://doi.org/10.1007/s00339-014-8637-3

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  • DOI: https://doi.org/10.1007/s00339-014-8637-3

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