Design of a compact, fully-autonomous 433 MHz tunable antenna for wearable wireless sensor applications

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dc.contributor.authorBuckley, John
dc.contributor.authorMcCarthy, Kevin G.
dc.contributor.authorGaetano, Domenico
dc.contributor.authorLoizou, Loizos
dc.contributor.authorO'Flynn, Brendan
dc.contributor.authorÓ Mathúna, S. Cian
dc.contributor.funderSeventh Framework Programmeen
dc.contributor.funderEnterprise Irelanden
dc.date.accessioned2020-01-23T12:26:46Z
dc.date.available2020-01-23T12:26:46Z
dc.date.issued2017-03-18
dc.date.updated2020-01-23T12:15:41Z
dc.description.abstractThe authors present the design of a tunable 433 MHz antenna that is tailored for wearable wireless sensor applications. This study first presents a detailed analysis of the measured impedance characteristics of a chosen antenna under test (AUT) in varying proximity to a human test subject. Instead of limiting the analysis to the head and hand only, this analysis measures the AUT impedance at varying distances from 11 different body positions. A novel antenna equivalent circuit model is then developed that enables both the free-space and total on-body AUT impedance variation to be rapidly computed using a circuit simulator instead of the requirement for computationally intensive finite-element methods for example. The design and characterisation of a tunable matching network that enables AUT impedance matching for 11 different positions on the human body is then outlined. Finally, a fully-autonomous 433 MHz tunable antenna is demonstrated. The antenna occupies a small printed circuit board area of 51 × 28 mm and is printed on standard FR-4 material with the tuner completely integrated into the antenna itself. Prototype measurements show an improvement of 3.9 dB in power delivery to the antenna for a load voltage standing wave ratio of 17:1, with a maximum matching loss of 0.84 dB and S 11 (−10 dB) ≥ 18 MHz for all load conditions.en
dc.description.sponsorshipEnterprise Ireland (Grant PC_2008_324)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationBuckley, J. L., McCarthy, K. G., Gaetano, D., Loizou, L., O'Flynn, B. and O'Mathuna, C. (2017) 'Design of a compact, fully-autonomous 433 MHz tunable antenna for wearable wireless sensor applications', IET Microwaves, Antennas and Propagation, 11(4), pp. 548-556. doi: 10.1049/iet-map.2015.0712en
dc.identifier.doi10.1049/iet-map.2015.0712en
dc.identifier.eissn1751-8733
dc.identifier.endpage556en
dc.identifier.issn1751-8725
dc.identifier.issued4en
dc.identifier.journaltitleIET Microwaves, Antennas and Propagationen
dc.identifier.startpage548en
dc.identifier.urihttps://hdl.handle.net/10468/9566
dc.identifier.volume11en
dc.language.isoenen
dc.publisherInstitution of Engineering and Technology (IET)en
dc.relation.projectinfo:eu-repo/grantAgreement/EC/FP7::SP1::ICT/288827/EU/SMArt systems Co-design/SMACen
dc.relation.urihttps://digital-library.theiet.org/content/journals/10.1049/iet-map.2015.0712
dc.rights© 2017, Institution of Engineering and Technology. This paper is a postprint of a paper submitted to and accepted for publication in IET Microwaves, Antennas and Propagation and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at the IET Digital Library.en
dc.subjectImpedance matchingen
dc.subjectBody sensor networksen
dc.subjectWearable antennasen
dc.subjectMicrostrip antennasen
dc.subjectUHF antennasen
dc.subjectPrinted circuitsen
dc.subjectAntenna testingen
dc.subjectEquivalent circuitsen
dc.titleDesign of a compact, fully-autonomous 433 MHz tunable antenna for wearable wireless sensor applicationsen
dc.typeArticle (peer-reviewed)en
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