Abstract
In this paper, an attractive, ultra-wideband, and polarization-insensitive fractal perfect metamaterial absorber had been proposed based on a tree-shaped microstructure. The absorber was composed of two dielectric substrates, a three-dimensional fractal metal tree, and four lumped resistances. The absorption mechanism and different modes for the absorber had been analyzed in simulation. The characters of polarized-insensitivity and wide-incident absorption for the proposed metamaterial absorber were systematically illuminated by the near electric fields, angular absorptions, and surface current distributions. A presented perfect metamaterial absorber device had been easily implemented using the common printed circuit board method and was measured in a microwave anechoic chamber. The results showed that this proposed FPMA provided a relative bandwidth of 86.9% with the absorptivity larger than 80%. Both the simulated and experimental results adequately verified the characters of wideband, wide-incident, and polarization-insensitive absorption.
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Acknowledgements
This work is partially supported by the National Natural Science Foundation of China under grant (Nos. 61671414, 61471389, 61501494, 61701523, 61801508), the Natural Science Foundational Research Fund of Shaanxi Province (Nos. 2017JM6025, 2018JM6040), the Young Talent fund of University Association for Science and Technology in Shaanxi Province (No. 20170107), Postdoctoral Innovative Talents Support Program of China (BX20180375), and Innovative Talents Cultivate Program of Shaanxi Province (No. 2017KJX-24). They also thank the reviewers for their valuable comments.
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Chen, T., Li, SJ., Cao, XY. et al. Ultra-wideband and polarization-insensitive fractal perfect metamaterial absorber based on a three-dimensional fractal tree microstructure with multi-modes. Appl. Phys. A 125, 232 (2019). https://doi.org/10.1007/s00339-019-2536-6
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DOI: https://doi.org/10.1007/s00339-019-2536-6