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RF-powered wearable energy harvesting and storage module based on e-textile coplanar waveguide rectenna and supercapacitor

RF-powered wearable energy harvesting and storage module based on e-textile coplanar waveguide rectenna and supercapacitor
RF-powered wearable energy harvesting and storage module based on e-textile coplanar waveguide rectenna and supercapacitor
This paper presents a high-efficiency compact(0.016λ02) textile-integrated energy harvesting and storage module for RF power transfer. A flexible 50 μm-thick coplanar waveguide rectenna filament is integrated with a spray-coated supercapacitor to realize an “e-textile” energy supply module. The meandered antenna maintains an S11< −6 dB inside and outside the fabric and in human proximity with a 2.3 dBi gain. The rectifier achieves a peak RF-DC efficiency of 80%, across a 4.5 kΩload, and a 1.8 V open-circuit voltage from −7 dBm. The supercapacitor is directly spray-coated on a cotton substrate using carbon and an aqueous electrolyte. When connected to the supercapacitor, the rectifier achieves over an octave half-power bandwidth. The textile-integrated rectenna is demonstrated charging the supercapacitor to 1.5 V (8.4 mJ) in 4 minutes, at 4.2 m from a license-free source, demonstrating a significant improvement over previous rectennas while eliminating power management circuitry. The integrated module has an end-to-end efficiency of 38% at 1.8 m from the transmitter. On-body, the rectenna’s efficiency is 4.8%, inclusive of in-body losses and transient shadowing, harvesting4 mJ in 32 seconds from 16.6 μW/cm2. It is concluded that e-textile rectennas are the most efficient method for powering wearables from μW/cm2 power densities
antenna, rectenna, supercapacitor, textile supercapacitor, textile antenna, textile rectenna, wearable antenna, wearable energy harvesting, textile energy storage, carbon textile supercapacitor, coplanar waveguide rectenna, E-textile
2637-6431
302-314
Wagih, Mahmoud
7e7b16ba-0c64-4f95-bd3c-99064055f693
Hillier, Nicholas
6bde7893-a2db-4edd-9e12-a8ab17aa3702
Yong, Sheng
688cbcf0-b32e-4b2b-9891-a0e0e1f59d71
Weddell, Alex S.
3d8c4d63-19b1-4072-a779-84d487fd6f03
Beeby, Steve
ba565001-2812-4300-89f1-fe5a437ecb0d
Wagih, Mahmoud
7e7b16ba-0c64-4f95-bd3c-99064055f693
Hillier, Nicholas
6bde7893-a2db-4edd-9e12-a8ab17aa3702
Yong, Sheng
688cbcf0-b32e-4b2b-9891-a0e0e1f59d71
Weddell, Alex S.
3d8c4d63-19b1-4072-a779-84d487fd6f03
Beeby, Steve
ba565001-2812-4300-89f1-fe5a437ecb0d

Wagih, Mahmoud, Hillier, Nicholas, Yong, Sheng, Weddell, Alex S. and Beeby, Steve (2021) RF-powered wearable energy harvesting and storage module based on e-textile coplanar waveguide rectenna and supercapacitor. IEEE Open Journal of Antennas and Propagation, 2, 302-314. (doi:10.1109/OJAP.2021.3059501).

Record type: Article

Abstract

This paper presents a high-efficiency compact(0.016λ02) textile-integrated energy harvesting and storage module for RF power transfer. A flexible 50 μm-thick coplanar waveguide rectenna filament is integrated with a spray-coated supercapacitor to realize an “e-textile” energy supply module. The meandered antenna maintains an S11< −6 dB inside and outside the fabric and in human proximity with a 2.3 dBi gain. The rectifier achieves a peak RF-DC efficiency of 80%, across a 4.5 kΩload, and a 1.8 V open-circuit voltage from −7 dBm. The supercapacitor is directly spray-coated on a cotton substrate using carbon and an aqueous electrolyte. When connected to the supercapacitor, the rectifier achieves over an octave half-power bandwidth. The textile-integrated rectenna is demonstrated charging the supercapacitor to 1.5 V (8.4 mJ) in 4 minutes, at 4.2 m from a license-free source, demonstrating a significant improvement over previous rectennas while eliminating power management circuitry. The integrated module has an end-to-end efficiency of 38% at 1.8 m from the transmitter. On-body, the rectenna’s efficiency is 4.8%, inclusive of in-body losses and transient shadowing, harvesting4 mJ in 32 seconds from 16.6 μW/cm2. It is concluded that e-textile rectennas are the most efficient method for powering wearables from μW/cm2 power densities

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MWagih_OJAP21_TextileCPWRectennaSupercap - Accepted Manuscript
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Accepted/In Press date: 5 February 2021
e-pub ahead of print date: 16 February 2021
Published date: 16 February 2021
Keywords: antenna, rectenna, supercapacitor, textile supercapacitor, textile antenna, textile rectenna, wearable antenna, wearable energy harvesting, textile energy storage, carbon textile supercapacitor, coplanar waveguide rectenna, E-textile

Identifiers

Local EPrints ID: 447449
URI: http://eprints.soton.ac.uk/id/eprint/447449
ISSN: 2637-6431
PURE UUID: 73dd46f2-060e-4b7c-933a-110905ab954f
ORCID for Mahmoud Wagih: ORCID iD orcid.org/0000-0002-7806-4333
ORCID for Nicholas Hillier: ORCID iD orcid.org/0000-0002-3544-8329
ORCID for Sheng Yong: ORCID iD orcid.org/0000-0002-8588-5981
ORCID for Alex S. Weddell: ORCID iD orcid.org/0000-0002-6763-5460
ORCID for Steve Beeby: ORCID iD orcid.org/0000-0002-0800-1759

Catalogue record

Date deposited: 11 Mar 2021 17:36
Last modified: 16 Sep 2021 11:16

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Contributors

Author: Mahmoud Wagih ORCID iD
Author: Nicholas Hillier ORCID iD
Author: Sheng Yong ORCID iD
Author: Alex S. Weddell ORCID iD
Author: Steve Beeby ORCID iD

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