A flexible 2.45-GHz power harvesting wristband with net system output from -24.3 dBm of RF power
A flexible 2.45-GHz power harvesting wristband with net system output from -24.3 dBm of RF power
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.
Boost converter, fabric antenna, fabric-to-PCB connector, Internet of Things, power management, rectenna array, rectenna impedance matching, rectennas, RF energy harvesting, RF power transfer, smart fabric, T-resonator method, textile antenna, two-line method
380-395
Adami, Salah Eddine
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Proynov, Plamen
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Hilton, Geoffrey S.
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Yang, Guang
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Zhang, Chunhong
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Zhu, Dibin
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Li, Yi
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Beeby, Steve P.
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Craddock, Ian J.
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Stark, Bernard H.
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1 January 2018
Adami, Salah Eddine
8ee79e33-d6a9-4220-aaee-8cc9eaad6709
Proynov, Plamen
bc25b4ae-f50c-457e-aa6e-696455797487
Hilton, Geoffrey S.
3edc9be4-ad15-4964-8093-953874cb9d94
Yang, Guang
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Zhang, Chunhong
cce36f3b-1878-49df-a416-b99bee45b543
Zhu, Dibin
ec52eae1-39fa-427c-968b-e76089a464a6
Li, Yi
e1298387-e0c9-4f1f-944c-c3da9b3a4b51
Beeby, Steve P.
ba565001-2812-4300-89f1-fe5a437ecb0d
Craddock, Ian J.
135d1b36-eabc-4676-9456-aa43c76ec51d
Stark, Bernard H.
b7f5894e-505c-43e3-a5be-3cc13e3220d0
Adami, Salah Eddine, Proynov, Plamen, Hilton, Geoffrey S., Yang, Guang, Zhang, Chunhong, Zhu, Dibin, Li, Yi, Beeby, Steve P., Craddock, Ian J. and Stark, Bernard H.
(2018)
A flexible 2.45-GHz power harvesting wristband with net system output from -24.3 dBm of RF power.
IEEE Transactions on Microwave Theory and Techniques, 66 (1), , [7955016].
(doi:10.1109/TMTT.2017.2700299).
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.
Text
07955016
- Version of Record
More information
Accepted/In Press date: 16 April 2017
e-pub ahead of print date: 22 June 2017
Published date: 1 January 2018
Keywords:
Boost converter, fabric antenna, fabric-to-PCB connector, Internet of Things, power management, rectenna array, rectenna impedance matching, rectennas, RF energy harvesting, RF power transfer, smart fabric, T-resonator method, textile antenna, two-line method
Identifiers
Local EPrints ID: 417420
URI: http://eprints.soton.ac.uk/id/eprint/417420
ISSN: 0018-9480
PURE UUID: d342f3b5-98b9-4b05-a9ca-160b2cc11fa9
Catalogue record
Date deposited: 31 Jan 2018 17:30
Last modified: 16 Mar 2024 02:45
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Contributors
Author:
Salah Eddine Adami
Author:
Plamen Proynov
Author:
Geoffrey S. Hilton
Author:
Guang Yang
Author:
Chunhong Zhang
Author:
Dibin Zhu
Author:
Yi Li
Author:
Steve P. Beeby
Author:
Ian J. Craddock
Author:
Bernard H. Stark
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