Potential of Sub-GHz wireless for future IoT wearables and design of compact 915 MHz antenna

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dc.contributor.authorDi Serio, Adolfo
dc.contributor.authorBuckley, John
dc.contributor.authorBarton, John
dc.contributor.authorNewberry, Robert
dc.contributor.authorRodencal, Matthew
dc.contributor.authorDunlop, Gary
dc.contributor.authorO'Flynn, Brendan
dc.contributor.funderEuropean Regional Development Fund
dc.contributor.funderScience Foundation Ireland
dc.contributor.funderSanmina Corporation
dc.date.accessioned2018-02-06T13:36:30Z
dc.date.available2018-02-06T13:36:30Z
dc.date.issued2017
dc.description.abstractInternet of Things (IoT) technology is rapidly emerging in medical applications as it offers the possibility of lower-cost personalized healthcare monitoring. At the present time, the 2.45 GHz band is in widespread use for these applications but in this paper, the authors investigate the potential of the 915 MHz ISM band in implementing future, wearable IoT devices. The target sensor is a wrist-worn wireless heart rate and arterial oxygen saturation (SpO2) monitor with the goal of providing efficient wireless functionality and long battery lifetime using a commercial Sub-GHz low-power radio transceiver. A detailed analysis of current consumption for various wireless protocols is also presented and analyzed. A novel 915 MHz antenna design of compact size is reported that has good resilience to detuning by the human body. The antenna also incorporates a matching network to meet the challenging bandwidth requirements and is fabricated using standard, low-cost FR-4 material. Full-Wave EM simulations are presented for the antenna placed in both free-space and on-body cases. A prototype antenna is demonstrated and has dimensions of 44 mm × 28 mm × 1.6 mm. The measured results at 915 MHz show a 10 dB return loss bandwidth of 55 MHz, a peak realized gain of − 2.37 dBi in free-space and − 6.1 dBi on-body. The paper concludes by highlighting the potential benefits of 915 MHz operation for future IoT devices.en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid22
dc.identifier.citationDi Serio, A., Buckley, J., Barton, J., Newberry, R., Rodencal, M., Dunlop, G. and O’Flynn, B. (2018) 'Potential of Sub-GHz wireless for future IoT wearables and design of compact 915 MHz antenna', Sensors, 18(1), 22 (25pp). doi: 10.3390/s18010022en
dc.identifier.doi10.3390/s18010022
dc.identifier.endpage25
dc.identifier.issn1424-8220
dc.identifier.issued1
dc.identifier.journaltitleSensorsen
dc.identifier.startpage1
dc.identifier.urihttps://hdl.handle.net/10468/5406
dc.identifier.volume18
dc.language.isoenen
dc.publisherMDPI AGen
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Research Centres/13/RC/2077/IE/CONNECT: The Centre for Future Networks & Communications/
dc.relation.urihttp://www.mdpi.com/1424-8220/18/1/22
dc.rights© 2017, by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).en
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectIoTen
dc.subjectISM banden
dc.subjectSmall antennaen
dc.subjectWearableen
dc.subjectMedicalen
dc.subjectSpO2en
dc.subjectWireless sensoren
dc.subjectWrist-worn antennaen
dc.titlePotential of Sub-GHz wireless for future IoT wearables and design of compact 915 MHz antennaen
dc.typeArticle (peer-reviewed)en
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