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

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dc.contributor.author Di Serio, Adolfo
dc.contributor.author Buckley, John
dc.contributor.author Barton, John
dc.contributor.author Newberry, Robert
dc.contributor.author Rodencal, Matthew
dc.contributor.author Dunlop, Gary
dc.contributor.author O'Flynn, Brendan
dc.date.accessioned 2018-02-06T13:36:30Z
dc.date.available 2018-02-06T13:36:30Z
dc.date.issued 2017
dc.identifier.citation Di 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/s18010022 en
dc.identifier.volume 18
dc.identifier.issued 1
dc.identifier.startpage 1
dc.identifier.endpage 25
dc.identifier.issn 1424-8220
dc.identifier.uri http://hdl.handle.net/10468/5406
dc.identifier.doi 10.3390/s18010022
dc.description.abstract Internet 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.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher MDPI AG en
dc.relation.uri http://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.uri http://creativecommons.org/licenses/by/4.0/
dc.subject IoT en
dc.subject ISM band en
dc.subject Small antenna en
dc.subject Wearable en
dc.subject Medical en
dc.subject SpO2 en
dc.subject Wireless sensor en
dc.subject Wrist-worn antenna en
dc.title Potential of Sub-GHz wireless for future IoT wearables and design of compact 915 MHz antenna en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother john.buckley@tyndall.ie en
dc.internal.availability Full text available en
dc.description.version Published Version en
dc.contributor.funder European Regional Development Fund
dc.contributor.funder Science Foundation Ireland
dc.contributor.funder Sanmina Corporation
dc.description.status Peer reviewed en
dc.identifier.journaltitle Sensors en
dc.internal.IRISemailaddress John Buckley, Tyndall National Institute, University College Cork, Cork, Ireland. +353-21-490-3000 Email: john.buckley@tyndall.ie en
dc.identifier.articleid 22
dc.relation.project info:eu-repo/grantAgreement/SFI/SFI Research Centres/13/RC/2077/IE/CONNECT: The Centre for Future Networks & Communications/


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© 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/). Except where otherwise noted, this item's license is described as © 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/).
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