An ultra-thin double-functional metasurface patch antenna for UHF RFID applications

Abstract An ultra-thin double-functional metasurface patch antenna (MPA) was proposed, where it can operate not only in the antenna mode but also can simultaneously act as perfect absorber for normal incident waves, suitable for RFID applications in the 868 MHz band. The MPA structure consists of a...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Mohsen Koohestani, Alireza Ghaneizadeh
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/36c2841d0710449e988dff36673e01db
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:36c2841d0710449e988dff36673e01db
record_format	dspace
spelling	oai:doaj.org-article:36c2841d0710449e988dff36673e01db2021-12-02T15:23:05ZAn ultra-thin double-functional metasurface patch antenna for UHF RFID applications10.1038/s41598-020-79506-52045-2322https://doaj.org/article/36c2841d0710449e988dff36673e01db2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79506-5https://doaj.org/toc/2045-2322Abstract An ultra-thin double-functional metasurface patch antenna (MPA) was proposed, where it can operate not only in the antenna mode but also can simultaneously act as perfect absorber for normal incident waves, suitable for RFID applications in the 868 MHz band. The MPA structure consists of a typical coaxially-fed patch antenna merged, for the first time, with a metasurface absorber acting as artificial ground. A methodology for the unit-cell design of the metasurface is proposed followed by an equivalent circuit model analysis, which makes it possible to transform a low-loss ( $$tan\delta =0.0015$$ t a n δ = 0.0015 ) unit-cell with highly-reflective characteristics to a perfect absorber for normal incident waves. It is based on modifying the critical external coupling by properly introducing slits on the unit-cell, allowing to design an ultra-thin ( $$\lambda _0/225$$ λ 0 / 225 at 868 MHz) and a very compact structure in comparison to previously developed designs. For validation purposes, the MPA was fabricated and its performances in both functional modes were characterized numerically and experimentally. It is demonstrated that merging the absorber with the patch not only allows obtaining a well-matched ( $$\|S_{11}\|<-30$$ \| S 11 \| < - 30 dB) antenna with an enhanced gain (by 175.6% compared to a typical patch) at the desired frequency but also leads to an overall thickness of only 2.5 mm ( $$\lambda _0/138.1$$ λ 0 / 138.1 at 868 MHz). With an absorber size limited to the MPA dimensions, a reasonable 1.3 dB reduction in powers reflected by the MPA was achieved compared to a similar size metallic sheet. Whilst having the lowest profile among the so far reported RFID readers, the proposed MPA can be conveniently fitted for example within the required volume of smart shelf RFID readers or used in portable RFID readers while being capable of mitigating multipath reflection issues and incorrect reading of RFID.Mohsen KoohestaniAlireza GhaneizadehNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mohsen Koohestani Alireza Ghaneizadeh An ultra-thin double-functional metasurface patch antenna for UHF RFID applications
description	Abstract An ultra-thin double-functional metasurface patch antenna (MPA) was proposed, where it can operate not only in the antenna mode but also can simultaneously act as perfect absorber for normal incident waves, suitable for RFID applications in the 868 MHz band. The MPA structure consists of a typical coaxially-fed patch antenna merged, for the first time, with a metasurface absorber acting as artificial ground. A methodology for the unit-cell design of the metasurface is proposed followed by an equivalent circuit model analysis, which makes it possible to transform a low-loss ( $$tan\delta =0.0015$$ t a n δ = 0.0015 ) unit-cell with highly-reflective characteristics to a perfect absorber for normal incident waves. It is based on modifying the critical external coupling by properly introducing slits on the unit-cell, allowing to design an ultra-thin ( $$\lambda _0/225$$ λ 0 / 225 at 868 MHz) and a very compact structure in comparison to previously developed designs. For validation purposes, the MPA was fabricated and its performances in both functional modes were characterized numerically and experimentally. It is demonstrated that merging the absorber with the patch not only allows obtaining a well-matched ( $$\|S_{11}\|<-30$$ \| S 11 \| < - 30 dB) antenna with an enhanced gain (by 175.6% compared to a typical patch) at the desired frequency but also leads to an overall thickness of only 2.5 mm ( $$\lambda _0/138.1$$ λ 0 / 138.1 at 868 MHz). With an absorber size limited to the MPA dimensions, a reasonable 1.3 dB reduction in powers reflected by the MPA was achieved compared to a similar size metallic sheet. Whilst having the lowest profile among the so far reported RFID readers, the proposed MPA can be conveniently fitted for example within the required volume of smart shelf RFID readers or used in portable RFID readers while being capable of mitigating multipath reflection issues and incorrect reading of RFID.
format	article
author	Mohsen Koohestani Alireza Ghaneizadeh
author_facet	Mohsen Koohestani Alireza Ghaneizadeh
author_sort	Mohsen Koohestani
title	An ultra-thin double-functional metasurface patch antenna for UHF RFID applications
title_short	An ultra-thin double-functional metasurface patch antenna for UHF RFID applications
title_full	An ultra-thin double-functional metasurface patch antenna for UHF RFID applications
title_fullStr	An ultra-thin double-functional metasurface patch antenna for UHF RFID applications
title_full_unstemmed	An ultra-thin double-functional metasurface patch antenna for UHF RFID applications
title_sort	ultra-thin double-functional metasurface patch antenna for uhf rfid applications
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/36c2841d0710449e988dff36673e01db
work_keys_str_mv	AT mohsenkoohestani anultrathindoublefunctionalmetasurfacepatchantennaforuhfrfidapplications AT alirezaghaneizadeh anultrathindoublefunctionalmetasurfacepatchantennaforuhfrfidapplications AT mohsenkoohestani ultrathindoublefunctionalmetasurfacepatchantennaforuhfrfidapplications AT alirezaghaneizadeh ultrathindoublefunctionalmetasurfacepatchantennaforuhfrfidapplications
_version_	1718387317137211392

An ultra-thin double-functional metasurface patch antenna for UHF RFID applications

Ejemplares similares