Optically transparent wideband metamaterial absorber based on equivalent aperture and characteristic mode analysis

Author:

Zheng Qi1ORCID,Qi Jingjing1,Ma Jinyu1,PourMohammadi Peyman23ORCID,Li Qiwei45ORCID

Affiliation:

1. School of Communication and Information Engineering, Shanghai University 1 , Shanghai 200444, China

2. Department of Electrical Engineering, ESAT-WaveCoRE Research Division, KU Leuven 2 , Leuven 3001, Belgium

3. Institut National de la Recherche Scientifique (INRS), University of Quebec 3 , Québec City, Québec G1K 9A9, Canada

4. School of Electronics and Information, Northwestern Polytechnical University 4 , Xi’an 710129, China

5. China Academy of Space Technology (Xi’an) 5 , Xi’an 710100, People’s Republic of China

Abstract

In this work, a low-profile optical transparent wideband metamaterial absorber based on radiation–absorption reciprocal theory is proposed. The top layer and bottom layer are composed of indium tin oxide–polyethylene terephthalate films, and the middle layer is a transparent substrate polymethyl methacrylate. The method of transparent wideband absorption using reciprocal theory is proposed to guide the design. Based on characteristic mode analysis and calculated equivalent aperture efficiency, the absorber consisting of composite resonators is analyzed and designed. The equivalent circuit model and surface current distributions are studied to verify the design. The numerical results show that high absorption of greater than 90% in the frequency range of 5.7–16.4 GHz is obtained. A wideband absorption rate of greater than 80% at a 60° incident angle under TM polarization and an absorption rate of greater than 65% at a 60° incident angle under TE polarization are obtained. The proposed design has the advantages of broadband absorption, polarization insensitivity, light transmittance of more than 70%, and compact structure, which can be applied to special scenes that require optical transparency, such as anechoic chamber glass and cockpit glass.

Funder

Natural Science Foundation of Shanghai

National Key Laboratory of Science and Technology on Space Microwave

China Academy of Space Technology Outstanding Talent Fund

Publisher

AIP Publishing

Subject

General Physics and Astronomy

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