Broadband and thin magnetic absorber with non-Foster metasurface for admittance matching

Abstract One of the long-standing and challenging problems in microwave engineering is the realization of ultra-wideband absorption using extremely-thin structures. Magnetic material can facilitate thickness reduction for microwave absorbers but also bring inherent narrowband admittance matching con...

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Autores principales:	Jinchao Mou, Zhongxiang Shen
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/e6ef4a4eea824ec4ac679f5674e8380f
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spelling	oai:doaj.org-article:e6ef4a4eea824ec4ac679f5674e8380f2021-12-02T12:32:13ZBroadband and thin magnetic absorber with non-Foster metasurface for admittance matching10.1038/s41598-017-07323-42045-2322https://doaj.org/article/e6ef4a4eea824ec4ac679f5674e8380f2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07323-4https://doaj.org/toc/2045-2322Abstract One of the long-standing and challenging problems in microwave engineering is the realization of ultra-wideband absorption using extremely-thin structures. Magnetic material can facilitate thickness reduction for microwave absorbers but also bring inherent narrowband admittance matching conundrum originating from its frequency-dispersive permeability and high permittivity. In this paper, we propose a simple and yet effective solution based on the concept of admittance matching with non-Foster metasurface (NFMS). Building on this concept, an ultra-wideband and extremely-thin magnetic absorber is achieved, with a simple structure consisting of a conductor-backed magnetic sheet (CMBS) coated by a NFMS. The NFMS with negatively inductive susceptance can properly cancel its positively frequency-dispersive counterpart from the CMBS so that constructive interference near the absorber can be obtained over a wide frequency band. Furthermore, the NFMS will compensate the surface conductance required for maximum incident power dissipation. As an example, we demonstrate an absorber with one-frequency decade bandwidth and a thickness of only 1/255 wavelength at the lowest operation frequency. The proposed concept enables versatile admittance matching techniques using a single-layered and has the potential to be used in the development of interesting low-profile and broadband microwave devices.Jinchao MouZhongxiang ShenNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jinchao Mou Zhongxiang Shen Broadband and thin magnetic absorber with non-Foster metasurface for admittance matching
description	Abstract One of the long-standing and challenging problems in microwave engineering is the realization of ultra-wideband absorption using extremely-thin structures. Magnetic material can facilitate thickness reduction for microwave absorbers but also bring inherent narrowband admittance matching conundrum originating from its frequency-dispersive permeability and high permittivity. In this paper, we propose a simple and yet effective solution based on the concept of admittance matching with non-Foster metasurface (NFMS). Building on this concept, an ultra-wideband and extremely-thin magnetic absorber is achieved, with a simple structure consisting of a conductor-backed magnetic sheet (CMBS) coated by a NFMS. The NFMS with negatively inductive susceptance can properly cancel its positively frequency-dispersive counterpart from the CMBS so that constructive interference near the absorber can be obtained over a wide frequency band. Furthermore, the NFMS will compensate the surface conductance required for maximum incident power dissipation. As an example, we demonstrate an absorber with one-frequency decade bandwidth and a thickness of only 1/255 wavelength at the lowest operation frequency. The proposed concept enables versatile admittance matching techniques using a single-layered and has the potential to be used in the development of interesting low-profile and broadband microwave devices.
format	article
author	Jinchao Mou Zhongxiang Shen
author_facet	Jinchao Mou Zhongxiang Shen
author_sort	Jinchao Mou
title	Broadband and thin magnetic absorber with non-Foster metasurface for admittance matching
title_short	Broadband and thin magnetic absorber with non-Foster metasurface for admittance matching
title_full	Broadband and thin magnetic absorber with non-Foster metasurface for admittance matching
title_fullStr	Broadband and thin magnetic absorber with non-Foster metasurface for admittance matching
title_full_unstemmed	Broadband and thin magnetic absorber with non-Foster metasurface for admittance matching
title_sort	broadband and thin magnetic absorber with non-foster metasurface for admittance matching
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/e6ef4a4eea824ec4ac679f5674e8380f
work_keys_str_mv	AT jinchaomou broadbandandthinmagneticabsorberwithnonfostermetasurfaceforadmittancematching AT zhongxiangshen broadbandandthinmagneticabsorberwithnonfostermetasurfaceforadmittancematching
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Broadband and thin magnetic absorber with non-Foster metasurface for admittance matching

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