All-metal wideband metasurface for near-field transformation of medium-to-high gain electromagnetic sources

Abstract Electromagnetic (EM) metasurfaces are essential in a wide range of EM engineering applications, from incorporated into antenna designs to separate devices like radome. Near-field manipulators are a class of metasurfaces engineered to tailor an EM source’s radiation patterns by manipulating...

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Autores principales:	Ali Lalbakhsh, Muhammad U. Afzal, Touseef Hayat, Karu P. Esselle, Kaushik Mandal
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b3765b54c19843bc9a3b2ebe2dacc354
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spelling	oai:doaj.org-article:b3765b54c19843bc9a3b2ebe2dacc3542021-12-02T14:29:04ZAll-metal wideband metasurface for near-field transformation of medium-to-high gain electromagnetic sources10.1038/s41598-021-88547-32045-2322https://doaj.org/article/b3765b54c19843bc9a3b2ebe2dacc3542021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-88547-3https://doaj.org/toc/2045-2322Abstract Electromagnetic (EM) metasurfaces are essential in a wide range of EM engineering applications, from incorporated into antenna designs to separate devices like radome. Near-field manipulators are a class of metasurfaces engineered to tailor an EM source’s radiation patterns by manipulating its near-field components. They can be made of all-dielectric, hybrid, or all-metal materials; however, simultaneously delivering a set of desired specifications by an all-metal structure is more challenging due to limitations of a substrate-less configuration. The existing near-field phase manipulators have at least one of the following limitations; expensive dielectric-based prototyping, subject to ray tracing approximation and conditions, narrowband performance, costly manufacturing, and polarization dependence. In contrast, we propose an all-metal wideband phase correcting structure (AWPCS) with none of these limitations and is designed based on the relative phase error extracted by post-processing the actual near-field distributions of any EM sources. Hence, it is applicable to any antennas, including those that cannot be accurately analyzed with ray-tracing, particularly for near-field analysis. To experimentally verify the wideband performance of the AWPCS, a shortened horn antenna with a large apex angle and a non-uniform near-field phase distribution is used as an EM source for the AWPCS. The measured results verify a significant improvement in the antenna’s aperture phase distribution in a large frequency band of 25%.Ali LalbakhshMuhammad U. AfzalTouseef HayatKaru P. EsselleKaushik MandalNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ali Lalbakhsh Muhammad U. Afzal Touseef Hayat Karu P. Esselle Kaushik Mandal All-metal wideband metasurface for near-field transformation of medium-to-high gain electromagnetic sources
description	Abstract Electromagnetic (EM) metasurfaces are essential in a wide range of EM engineering applications, from incorporated into antenna designs to separate devices like radome. Near-field manipulators are a class of metasurfaces engineered to tailor an EM source’s radiation patterns by manipulating its near-field components. They can be made of all-dielectric, hybrid, or all-metal materials; however, simultaneously delivering a set of desired specifications by an all-metal structure is more challenging due to limitations of a substrate-less configuration. The existing near-field phase manipulators have at least one of the following limitations; expensive dielectric-based prototyping, subject to ray tracing approximation and conditions, narrowband performance, costly manufacturing, and polarization dependence. In contrast, we propose an all-metal wideband phase correcting structure (AWPCS) with none of these limitations and is designed based on the relative phase error extracted by post-processing the actual near-field distributions of any EM sources. Hence, it is applicable to any antennas, including those that cannot be accurately analyzed with ray-tracing, particularly for near-field analysis. To experimentally verify the wideband performance of the AWPCS, a shortened horn antenna with a large apex angle and a non-uniform near-field phase distribution is used as an EM source for the AWPCS. The measured results verify a significant improvement in the antenna’s aperture phase distribution in a large frequency band of 25%.
format	article
author	Ali Lalbakhsh Muhammad U. Afzal Touseef Hayat Karu P. Esselle Kaushik Mandal
author_facet	Ali Lalbakhsh Muhammad U. Afzal Touseef Hayat Karu P. Esselle Kaushik Mandal
author_sort	Ali Lalbakhsh
title	All-metal wideband metasurface for near-field transformation of medium-to-high gain electromagnetic sources
title_short	All-metal wideband metasurface for near-field transformation of medium-to-high gain electromagnetic sources
title_full	All-metal wideband metasurface for near-field transformation of medium-to-high gain electromagnetic sources
title_fullStr	All-metal wideband metasurface for near-field transformation of medium-to-high gain electromagnetic sources
title_full_unstemmed	All-metal wideband metasurface for near-field transformation of medium-to-high gain electromagnetic sources
title_sort	all-metal wideband metasurface for near-field transformation of medium-to-high gain electromagnetic sources
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/b3765b54c19843bc9a3b2ebe2dacc354
work_keys_str_mv	AT alilalbakhsh allmetalwidebandmetasurfacefornearfieldtransformationofmediumtohighgainelectromagneticsources AT muhammaduafzal allmetalwidebandmetasurfacefornearfieldtransformationofmediumtohighgainelectromagneticsources AT touseefhayat allmetalwidebandmetasurfacefornearfieldtransformationofmediumtohighgainelectromagneticsources AT karupesselle allmetalwidebandmetasurfacefornearfieldtransformationofmediumtohighgainelectromagneticsources AT kaushikmandal allmetalwidebandmetasurfacefornearfieldtransformationofmediumtohighgainelectromagneticsources
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All-metal wideband metasurface for near-field transformation of medium-to-high gain electromagnetic sources

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