Abstract
In this letter, a polarization-independent broadband metamaterial absorber (MMA) for wide incidence angle is proposed. The MMA is composed of double-layer symmetric split rings connected with two orthogonally arranged bars and the ground metallic plane separated by two equal-sized substrates. The whole structure is with an ultra-thin thickness of 2.4 mm, which is 0.031\(\lambda\) corresponds to the lowest frequency of absorption peaks. Multiple metallic layers and multi-scalability are employed to provide broadband absorptivity based on the cooperated mechanisms of the Ohmic loss and the Fabry–Perot interference. A desirable absorption is achieved with double strong absorption peaks in 2–6 GHz and a broadband absorption in 10–24 GHz. The absorptivity can reach up to 100% with nearly all absorption peaks over 90%. The symmetry enables the MMA of satisfactory stability for polarization and incidence angles. Numerical and experimental results prove the capability of the proposed MMA for broadband absorbance.
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Acknowledgements
This work is partially supported by National Natural Science Foundation of China under Grant (nos. 61671464, 61501494, 61271100, 61471389). All authors thank the reviewers for their valuable comments.
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Cong, LL., Cao, XY., Song, T. et al. Polarization-independent wide-angle ultrathin double-layered metamaterial absorber for broadband application. Appl. Phys. A 124, 452 (2018). https://doi.org/10.1007/s00339-018-1686-2
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DOI: https://doi.org/10.1007/s00339-018-1686-2