A Flexible 2.45-GHz Power Harvesting Wristband with Net System Output from -24.3 dBm of RF Power
dc.contributor.author | Adami, SE | |
dc.contributor.author | Proynov, P | |
dc.contributor.author | Hilton, GS | |
dc.contributor.author | Yang, G | |
dc.contributor.author | Zhang, C | |
dc.contributor.author | Zhu, D | |
dc.contributor.author | Li, Y | |
dc.contributor.author | Beeby, SP | |
dc.contributor.author | Craddock, IJ | |
dc.contributor.author | Stark, BH | |
dc.date.accessioned | 2019-01-10T13:25:36Z | |
dc.date.issued | 2017-06-22 | |
dc.description.abstract | This paper presents a flexible 2.45-GHz wireless power harvesting wristband that generates a net dc output from a -24.3-dBm RF input. This is the lowest reported system sensitivity for systems comprising a rectenna and impedance-matching power management. A complete system has been implemented comprising: a fabric antenna, a rectifier on rigid substrate, a contactless electrical connection between rigid and flexible subsystems, and power electronics impedance matching. Various fabric and flexible materials are electrically characterized at 2.45 GHz using the two-line and the T-resonator methods. Selected materials are used to design an all-textile antenna, which demonstrates a radiation efficiency above 62% on a phantom irrespective of location, and a stable radiation pattern. The rectifier, designed on a rigid substrate, shows a best-in-class efficiency of 33.6% at -20 dBm. A reliable, efficient, and wideband contactless connection between the fabric antenna and the rectifier is created using broadside-coupled microstrip lines, with an insertion loss below 1 dB from 1.8 to over 10 GHz. A self-powered boost converter with a quiescent current of 150 nA matches the rectenna output with a matching efficiency above 95%. The maximum end-to-end efficiency is 28.7% at -7 dBm. The wristband harvester demonstrates net positive energy harvesting from -24.3 dBm, a 7.3-dB improvement on the state of the art. | en_GB |
dc.description.sponsorship | Engineering and Physical Sciences Research Council (EPSRC) | en_GB |
dc.identifier.citation | Vol. 66 (1), pp. 380 - 395 | en_GB |
dc.identifier.doi | 10.1109/TMTT.2017.2700299 | |
dc.identifier.uri | http://hdl.handle.net/10871/35417 | |
dc.language.iso | en | en_GB |
dc.publisher | Institute of Electrical and Electronics Engineers (IEEE) | en_GB |
dc.rights | Open access. This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/ | en_GB |
dc.subject | Fabrics | en_GB |
dc.subject | Radio frequency | en_GB |
dc.subject | Rectennas | en_GB |
dc.subject | Substrates | en_GB |
dc.subject | Microstrip | en_GB |
dc.subject | Permittivity | en_GB |
dc.title | A Flexible 2.45-GHz Power Harvesting Wristband with Net System Output from -24.3 dBm of RF Power | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2019-01-10T13:25:36Z | |
dc.identifier.issn | 0018-9480 | |
dc.description | This is the final version. Available from IEEE via the DOI in this record | en_GB |
dc.identifier.journal | IEEE Transactions on Microwave Theory and Techniques | en_GB |
dc.rights.uri | https://creativecommons.org/licenses/by/3.0/ | en_GB |
dcterms.dateAccepted | 2017-04-16 | |
rioxxterms.version | VoR | en_GB |
rioxxterms.licenseref.startdate | 2018-01-01 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2019-01-10T13:18:34Z | |
refterms.versionFCD | VoR | |
refterms.dateFOA | 2019-01-10T13:25:48Z | |
refterms.panel | B | en_GB |
refterms.depositException | publishedGoldOA |
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Except where otherwise noted, this item's licence is described as Open access. This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/