Orbital Angular Momentum (OAM) Antennas via Mode Combining and Canceling in Near-field

Abstract Orbital angular momentum (OAM) mode combining and canceling in the near-field was investigated using a Cassegrain dual-reflectarray antenna composed of multiple microstrip patches on the main and sub-reflectarrays. Microstrip patches on dielectric substrates were designed to radiate the par...

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Autores principales:	Woo Jin Byun, Hyung Do Choi, Yong Heui Cho
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/513dda5a3f0649c597c96cbd36ddf544
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spelling	oai:doaj.org-article:513dda5a3f0649c597c96cbd36ddf5442021-12-02T15:06:16ZOrbital Angular Momentum (OAM) Antennas via Mode Combining and Canceling in Near-field10.1038/s41598-017-13125-52045-2322https://doaj.org/article/513dda5a3f0649c597c96cbd36ddf5442017-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-13125-5https://doaj.org/toc/2045-2322Abstract Orbital angular momentum (OAM) mode combining and canceling in the near-field was investigated using a Cassegrain dual-reflectarray antenna composed of multiple microstrip patches on the main and sub-reflectarrays. Microstrip patches on dielectric substrates were designed to radiate the particular OAM modes for arithmetic mode combining, where two OAM wave-generating reflectarrays are very closely placed in the near-field. We conducted near-field antenna measurements at 18 [GHz] by manually replacing the sub-reflectarray substrates with different OAM mode numbers of 0, ±1, when the OAM mode number of the main reflectarray was fixed to +1. We subsequently checked the azimuthal phase distributions of the reflected total electromagnetic waves in the near-field, and verified that the OAM waves mutually reflected from the main and sub-reflectarrays are added or subtracted to each other according to their OAM mode numbers. Based on our proposal, an OAM mode-canceling reflectarray antenna was designed, and the following measurements indicate that the antenna has a better reflection bandwidth and antenna gain than a conventional reflectarray antenna. The concept of OAM mode canceling in the near-field can contribute widely to a new type of low-profile, broad-reflection bandwidth, and high-gain antenna.Woo Jin ByunHyung Do ChoiYong Heui ChoNature 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 Woo Jin Byun Hyung Do Choi Yong Heui Cho Orbital Angular Momentum (OAM) Antennas via Mode Combining and Canceling in Near-field
description	Abstract Orbital angular momentum (OAM) mode combining and canceling in the near-field was investigated using a Cassegrain dual-reflectarray antenna composed of multiple microstrip patches on the main and sub-reflectarrays. Microstrip patches on dielectric substrates were designed to radiate the particular OAM modes for arithmetic mode combining, where two OAM wave-generating reflectarrays are very closely placed in the near-field. We conducted near-field antenna measurements at 18 [GHz] by manually replacing the sub-reflectarray substrates with different OAM mode numbers of 0, ±1, when the OAM mode number of the main reflectarray was fixed to +1. We subsequently checked the azimuthal phase distributions of the reflected total electromagnetic waves in the near-field, and verified that the OAM waves mutually reflected from the main and sub-reflectarrays are added or subtracted to each other according to their OAM mode numbers. Based on our proposal, an OAM mode-canceling reflectarray antenna was designed, and the following measurements indicate that the antenna has a better reflection bandwidth and antenna gain than a conventional reflectarray antenna. The concept of OAM mode canceling in the near-field can contribute widely to a new type of low-profile, broad-reflection bandwidth, and high-gain antenna.
format	article
author	Woo Jin Byun Hyung Do Choi Yong Heui Cho
author_facet	Woo Jin Byun Hyung Do Choi Yong Heui Cho
author_sort	Woo Jin Byun
title	Orbital Angular Momentum (OAM) Antennas via Mode Combining and Canceling in Near-field
title_short	Orbital Angular Momentum (OAM) Antennas via Mode Combining and Canceling in Near-field
title_full	Orbital Angular Momentum (OAM) Antennas via Mode Combining and Canceling in Near-field
title_fullStr	Orbital Angular Momentum (OAM) Antennas via Mode Combining and Canceling in Near-field
title_full_unstemmed	Orbital Angular Momentum (OAM) Antennas via Mode Combining and Canceling in Near-field
title_sort	orbital angular momentum (oam) antennas via mode combining and canceling in near-field
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/513dda5a3f0649c597c96cbd36ddf544
work_keys_str_mv	AT woojinbyun orbitalangularmomentumoamantennasviamodecombiningandcancelinginnearfield AT hyungdochoi orbitalangularmomentumoamantennasviamodecombiningandcancelinginnearfield AT yongheuicho orbitalangularmomentumoamantennasviamodecombiningandcancelinginnearfield
_version_	1718388511382437888

Orbital Angular Momentum (OAM) Antennas via Mode Combining and Canceling in Near-field

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