Detecting the Orbital Angular Momentum of Electro-Magnetic Waves Using Virtual Rotational Antenna

Abstract Orbital Angular Momentum (OAM) is a typical spatial mode of an Electro-Magnetic (EM) wave. Correctly detecting the OAM mode is fundamental and of foremost importance when applying the phenomenon to wireless transmission in free space. It is found that when rotating an OAM wave, a rotational...

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Autores principales:	Chao ZHANG, Lu MA
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/04a9e8f28e38473f9575e69863981499
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id	oai:doaj.org-article:04a9e8f28e38473f9575e69863981499
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spelling	oai:doaj.org-article:04a9e8f28e38473f9575e698639814992021-12-02T16:06:24ZDetecting the Orbital Angular Momentum of Electro-Magnetic Waves Using Virtual Rotational Antenna10.1038/s41598-017-04313-42045-2322https://doaj.org/article/04a9e8f28e38473f9575e698639814992017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04313-4https://doaj.org/toc/2045-2322Abstract Orbital Angular Momentum (OAM) is a typical spatial mode of an Electro-Magnetic (EM) wave. Correctly detecting the OAM mode is fundamental and of foremost importance when applying the phenomenon to wireless transmission in free space. It is found that when rotating an OAM wave, a rotational Doppler shift that is proportional to the rotation speed and the OAM mode number can be observed. This property can be used for OAM detection, i.e., different OAM modes are identified by measuring the corresponding rotational Doppler frequency shifts. In previous work, this method was implemented by mechanically rotating the OAM wave, resulting in a small frequency shift. Since the high-speed mechanical rotation is hard to manufacture in a real system, it brings limitations to the bandwidth for each OAM wave. In this paper, we report on an OAM mode detection method based on digitally rotating a virtual antenna. The transmitter and receiver are physically fixed, but the Virtual Rotational Antenna (VRA) is obtained by interpolating the signals received from transverse-mounted receiving antennas. A large rotational Doppler shift occurs as a consequence of using digital processing, resulting in more capability for wideband wireless data transmission with the larger shifted frequency.Chao ZHANGLu MANature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chao ZHANG Lu MA Detecting the Orbital Angular Momentum of Electro-Magnetic Waves Using Virtual Rotational Antenna
description	Abstract Orbital Angular Momentum (OAM) is a typical spatial mode of an Electro-Magnetic (EM) wave. Correctly detecting the OAM mode is fundamental and of foremost importance when applying the phenomenon to wireless transmission in free space. It is found that when rotating an OAM wave, a rotational Doppler shift that is proportional to the rotation speed and the OAM mode number can be observed. This property can be used for OAM detection, i.e., different OAM modes are identified by measuring the corresponding rotational Doppler frequency shifts. In previous work, this method was implemented by mechanically rotating the OAM wave, resulting in a small frequency shift. Since the high-speed mechanical rotation is hard to manufacture in a real system, it brings limitations to the bandwidth for each OAM wave. In this paper, we report on an OAM mode detection method based on digitally rotating a virtual antenna. The transmitter and receiver are physically fixed, but the Virtual Rotational Antenna (VRA) is obtained by interpolating the signals received from transverse-mounted receiving antennas. A large rotational Doppler shift occurs as a consequence of using digital processing, resulting in more capability for wideband wireless data transmission with the larger shifted frequency.
format	article
author	Chao ZHANG Lu MA
author_facet	Chao ZHANG Lu MA
author_sort	Chao ZHANG
title	Detecting the Orbital Angular Momentum of Electro-Magnetic Waves Using Virtual Rotational Antenna
title_short	Detecting the Orbital Angular Momentum of Electro-Magnetic Waves Using Virtual Rotational Antenna
title_full	Detecting the Orbital Angular Momentum of Electro-Magnetic Waves Using Virtual Rotational Antenna
title_fullStr	Detecting the Orbital Angular Momentum of Electro-Magnetic Waves Using Virtual Rotational Antenna
title_full_unstemmed	Detecting the Orbital Angular Momentum of Electro-Magnetic Waves Using Virtual Rotational Antenna
title_sort	detecting the orbital angular momentum of electro-magnetic waves using virtual rotational antenna
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/04a9e8f28e38473f9575e69863981499
work_keys_str_mv	AT chaozhang detectingtheorbitalangularmomentumofelectromagneticwavesusingvirtualrotationalantenna AT luma detectingtheorbitalangularmomentumofelectromagneticwavesusingvirtualrotationalantenna
_version_	1718385004816367616

Detecting the Orbital Angular Momentum of Electro-Magnetic Waves Using Virtual Rotational Antenna

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