Directivity enhancement of a cylindrical wire antenna by a graded index dielectric shell designed using strictly conformal transformation optics

Abstract A transformation-optical method is presented to enhance the directivity of a cylindrical wire antenna by using an all-dielectric graded index medium. The strictly conformal mapping between two doubly connected virtual and physical domains is established numerically. Multiple directive beams...

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Autores principales:	Hossein Eskandari, Soorena Saviz, Tomáš Tyc
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9feb8918c13d420d99b0c7a2527b8a6d
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spelling	oai:doaj.org-article:9feb8918c13d420d99b0c7a2527b8a6d2021-12-02T18:02:44ZDirectivity enhancement of a cylindrical wire antenna by a graded index dielectric shell designed using strictly conformal transformation optics10.1038/s41598-021-92200-42045-2322https://doaj.org/article/9feb8918c13d420d99b0c7a2527b8a6d2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92200-4https://doaj.org/toc/2045-2322Abstract A transformation-optical method is presented to enhance the directivity of a cylindrical wire antenna by using an all-dielectric graded index medium. The strictly conformal mapping between two doubly connected virtual and physical domains is established numerically. Multiple directive beams are produced, providing directive emission. The state-of-the-art optical path rescaling method is employed to mitigate the superluminal regions. The resulting transformation medium is all-dielectric and nondispersive, which can provide broadband functionality and facilitate the realization of the device using available fabrication technologies. The realization of the device is demonstrated by dielectric perforation based on the effective medium theory. The device’s functionality is verified by carrying out both ray-tracing and full-wave simulations using finite-element-based software COMSOL Multiphysics.Hossein EskandariSoorena SavizTomáš TycNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Hossein Eskandari Soorena Saviz Tomáš Tyc Directivity enhancement of a cylindrical wire antenna by a graded index dielectric shell designed using strictly conformal transformation optics
description	Abstract A transformation-optical method is presented to enhance the directivity of a cylindrical wire antenna by using an all-dielectric graded index medium. The strictly conformal mapping between two doubly connected virtual and physical domains is established numerically. Multiple directive beams are produced, providing directive emission. The state-of-the-art optical path rescaling method is employed to mitigate the superluminal regions. The resulting transformation medium is all-dielectric and nondispersive, which can provide broadband functionality and facilitate the realization of the device using available fabrication technologies. The realization of the device is demonstrated by dielectric perforation based on the effective medium theory. The device’s functionality is verified by carrying out both ray-tracing and full-wave simulations using finite-element-based software COMSOL Multiphysics.
format	article
author	Hossein Eskandari Soorena Saviz Tomáš Tyc
author_facet	Hossein Eskandari Soorena Saviz Tomáš Tyc
author_sort	Hossein Eskandari
title	Directivity enhancement of a cylindrical wire antenna by a graded index dielectric shell designed using strictly conformal transformation optics
title_short	Directivity enhancement of a cylindrical wire antenna by a graded index dielectric shell designed using strictly conformal transformation optics
title_full	Directivity enhancement of a cylindrical wire antenna by a graded index dielectric shell designed using strictly conformal transformation optics
title_fullStr	Directivity enhancement of a cylindrical wire antenna by a graded index dielectric shell designed using strictly conformal transformation optics
title_full_unstemmed	Directivity enhancement of a cylindrical wire antenna by a graded index dielectric shell designed using strictly conformal transformation optics
title_sort	directivity enhancement of a cylindrical wire antenna by a graded index dielectric shell designed using strictly conformal transformation optics
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/9feb8918c13d420d99b0c7a2527b8a6d
work_keys_str_mv	AT hosseineskandari directivityenhancementofacylindricalwireantennabyagradedindexdielectricshelldesignedusingstrictlyconformaltransformationoptics AT soorenasaviz directivityenhancementofacylindricalwireantennabyagradedindexdielectricshelldesignedusingstrictlyconformaltransformationoptics AT tomastyc directivityenhancementofacylindricalwireantennabyagradedindexdielectricshelldesignedusingstrictlyconformaltransformationoptics
_version_	1718378885113970688

Directivity enhancement of a cylindrical wire antenna by a graded index dielectric shell designed using strictly conformal transformation optics

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