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An ultra-wideband, polarization insensitive metamaterial absorber based on multiple resistive film layers with wide-incident-angle stability

Published online by Cambridge University Press:  14 May 2020

Guangsheng Deng
Affiliation:
Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei230009, China
Kun Lv
Affiliation:
Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei230009, China
Hanxiao Sun
Affiliation:
Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei230009, China
Yuan Hong
Affiliation:
Process and Mechanical Engineering Technology Laboratory, Space Star Technology Co. Ltd., Beijing100095, China
Xiaoying Zhang
Affiliation:
Process and Mechanical Engineering Technology Laboratory, Space Star Technology Co. Ltd., Beijing100095, China
Zhiping Yin
Affiliation:
Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei230009, China
Ying Li
Affiliation:
Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei230009, China
Jun Yang*
Affiliation:
Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electronic Technology, Hefei University of Technology, Hefei230009, China
*
Author for correspondence: Jun Yang, E-mail: junyang@hfut.edu.cn

Abstract

In this work, we propose a broadband, polarization-insensitive and wide incident angle stable metamaterial absorber (MA) based on the resistive film. The absorber consists of a three-layer structure with each layer of dielectric substrate printed with different shapes of resistive film. The multilayer structure not only extends the absorption bandwidth but also maintains high absorption under large wave incident angles. Numerical simulation shows that the absorptivity of a normal incident wave is above 90% in the frequency range 2.34–18.95 GHz, corresponding to a relative absorption bandwidth of 156%. Moreover, the whole MA structure has a total thickness of 11.3 mm, corresponding to 0.09 λ0 at its lowest absorption frequency. Due to the high symmetry of the structure, the absorber has good polarization insensitivity. In addition, for both transverse electric and transverse magnetic incidence, the proposed absorber achieves an absorptivity of more than 80% at incident angles of up to 45° and thus has good stability for wide incident angles. The absorption principle of the absorber is analyzed by the surface current and power loss density distribution. Parameter analysis is also performed for bandwidth optimization. Due to its advantages of wideband absorption with high efficiency, the proposed absorber has the potential to be applied to the energy-harvesting and electromagnetic stealth fields.

Type
Metamaterials and Photonic Bandgap Structures
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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