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Omnidirectional dual-polarized low-profile textile rectenna with over 50% efficiency for sub-μW/cm2 wearable power harvesting

Omnidirectional dual-polarized low-profile textile rectenna with over 50% efficiency for sub-μW/cm2 wearable power harvesting
Omnidirectional dual-polarized low-profile textile rectenna with over 50% efficiency for sub-μW/cm2 wearable power harvesting
Despite the recent advances in textile antennas, in complete systems such as a rectenna, the efficiency of fully-textile solutions has been over 46% lower than hybrid textile/rigid implementations. This paper presents a fully-textile rectenna for ultra-low power sub-W/cm^2 applications. A dual-polarized omnidirectional low-profile textile antenna is presented. The rectenna is based on a compact inductively-matched rectifier. The textile-based rectifier occupies 0.22 cm^2 and achieves a state-of-art Power Conversion Efficiency (PCE) of 41.8% at -20 dBm, at 820 MHz, despite its lossy substrate. A triple-band rectifier is then designed and fabricated to show the scalability of the matching approach. The rectifier is characterized using a new figure of merit “average PCE” over a time period while charging a capacitor. Time-varying s-parameters are used to quantify the impact of the capacitor’s charge on the impedance matching. The rectifier directly charges a 1.32 mF capacitor up to 1 V in 0.41 and 4.5 seconds from 10 and 0 dBm, respectively. Wireless testing of the proposed rectenna demonstrates over 50% and 40% PCE below 1 μW/cm2 in space and on-body, respectively. The rectenna efficiently receives power from mismatched polarization and with a 360-degree half-power beamwidth.
Antenna, Electronic Textiles, Microstrip Antennas, Rectenna, Radio Frequency Energy Harvesting, Wearable Antenna, Wireless Power Transfer
0018-926X
Wagih, Mahmoud
7e7b16ba-0c64-4f95-bd3c-99064055f693
Weddell, Alex S.
3d8c4d63-19b1-4072-a779-84d487fd6f03
Beeby, Steve
ba565001-2812-4300-89f1-fe5a437ecb0d
Wagih, Mahmoud
7e7b16ba-0c64-4f95-bd3c-99064055f693
Weddell, Alex S.
3d8c4d63-19b1-4072-a779-84d487fd6f03
Beeby, Steve
ba565001-2812-4300-89f1-fe5a437ecb0d

Wagih, Mahmoud, Weddell, Alex S. and Beeby, Steve (2020) Omnidirectional dual-polarized low-profile textile rectenna with over 50% efficiency for sub-μW/cm2 wearable power harvesting. IEEE Transactions on Antennas and Propagation. (doi:10.1109/TAP.2020.3030992). (In Press)

Record type: Article

Abstract

Despite the recent advances in textile antennas, in complete systems such as a rectenna, the efficiency of fully-textile solutions has been over 46% lower than hybrid textile/rigid implementations. This paper presents a fully-textile rectenna for ultra-low power sub-W/cm^2 applications. A dual-polarized omnidirectional low-profile textile antenna is presented. The rectenna is based on a compact inductively-matched rectifier. The textile-based rectifier occupies 0.22 cm^2 and achieves a state-of-art Power Conversion Efficiency (PCE) of 41.8% at -20 dBm, at 820 MHz, despite its lossy substrate. A triple-band rectifier is then designed and fabricated to show the scalability of the matching approach. The rectifier is characterized using a new figure of merit “average PCE” over a time period while charging a capacitor. Time-varying s-parameters are used to quantify the impact of the capacitor’s charge on the impedance matching. The rectifier directly charges a 1.32 mF capacitor up to 1 V in 0.41 and 4.5 seconds from 10 and 0 dBm, respectively. Wireless testing of the proposed rectenna demonstrates over 50% and 40% PCE below 1 μW/cm2 in space and on-body, respectively. The rectenna efficiently receives power from mismatched polarization and with a 360-degree half-power beamwidth.

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Omnidirectional Dual Pol Textile Rectenna TAP Author Version - Accepted Manuscript
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Accepted/In Press date: 30 September 2020
Keywords: Antenna, Electronic Textiles, Microstrip Antennas, Rectenna, Radio Frequency Energy Harvesting, Wearable Antenna, Wireless Power Transfer

Identifiers

Local EPrints ID: 444501
URI: http://eprints.soton.ac.uk/id/eprint/444501
ISSN: 0018-926X
PURE UUID: 96bf9736-720b-4b0d-9af2-7cab7b37562f
ORCID for Mahmoud Wagih: ORCID iD orcid.org/0000-0002-7806-4333
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: 22 Oct 2020 16:30
Last modified: 16 Sep 2021 11:16

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Contributors

Author: Mahmoud Wagih ORCID iD
Author: Alex S. Weddell ORCID iD
Author: Steve Beeby ORCID iD

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