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Position independent wearable 6.78 MHz near-field radiative wireless power transfer using electrically-small embroidered textile coils

Position independent wearable 6.78 MHz near-field radiative wireless power transfer using electrically-small embroidered textile coils
Position independent wearable 6.78 MHz near-field radiative wireless power transfer using electrically-small embroidered textile coils
Coupled wireless power transfer (WPT) has been widely used for near-field high-efficiency WPT applications. However, the efficiency of the WPT link is highly sensitive to separation and alignment, and is prone to over-coupling, making it unsuitable for mobile systems with unknown or loose coupling such as wearables. While ultra-high frequency (UHF) and microwave radiative WPT (0.3-3 GHz) enables meters-long separation between the transmitter and the receiver, free space propagation losses, and rectification inefficiencies, adversely limit the end-to-end efficiency of the WPT link. This work proposes radiative WPT, in the 6.78 MHz license-free band, based on resonant electrically small antennas fabricated using embroidered textile coils, tuned using L-matching networks. The proposed WPT system achieves a stable forward transmission of S21>–17 dB and S21>–28 dB, independent of coil, separation on the XZ and XY planes respectively, in a 27 m3 volume space. The presented approach demonstrates the highest WPT-link efficiency, and promises higher end-to-end efficiency, compared to UHF WPT.
Wagih, Mahmoud
7e7b16ba-0c64-4f95-bd3c-99064055f693
Komolafe, Abiodun O.
5e79fbab-38be-4a64-94d5-867a94690932
Zaghari, Bahareh
a0537db6-0dce-49a2-8103-0f4599ab5f6a
Wagih, Mahmoud
7e7b16ba-0c64-4f95-bd3c-99064055f693
Komolafe, Abiodun O.
5e79fbab-38be-4a64-94d5-867a94690932
Zaghari, Bahareh
a0537db6-0dce-49a2-8103-0f4599ab5f6a

Wagih, Mahmoud, Komolafe, Abiodun O. and Zaghari, Bahareh (2019) Position independent wearable 6.78 MHz near-field radiative wireless power transfer using electrically-small embroidered textile coils. PowerMEMS 2019: International Conference on Micro and Nanotechnology for Power generation and Energy Conversion Applications, , Krakow, Poland. 03 - 06 Dec 2019. 5 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Coupled wireless power transfer (WPT) has been widely used for near-field high-efficiency WPT applications. However, the efficiency of the WPT link is highly sensitive to separation and alignment, and is prone to over-coupling, making it unsuitable for mobile systems with unknown or loose coupling such as wearables. While ultra-high frequency (UHF) and microwave radiative WPT (0.3-3 GHz) enables meters-long separation between the transmitter and the receiver, free space propagation losses, and rectification inefficiencies, adversely limit the end-to-end efficiency of the WPT link. This work proposes radiative WPT, in the 6.78 MHz license-free band, based on resonant electrically small antennas fabricated using embroidered textile coils, tuned using L-matching networks. The proposed WPT system achieves a stable forward transmission of S21>–17 dB and S21>–28 dB, independent of coil, separation on the XZ and XY planes respectively, in a 27 m3 volume space. The presented approach demonstrates the highest WPT-link efficiency, and promises higher end-to-end efficiency, compared to UHF WPT.

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Power MEMS Separation independent WPT full paper - Accepted Manuscript
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Published date: December 2019
Venue - Dates: PowerMEMS 2019: International Conference on Micro and Nanotechnology for Power generation and Energy Conversion Applications, , Krakow, Poland, 2019-12-03 - 2019-12-06

Identifiers

Local EPrints ID: 436232
URI: http://eprints.soton.ac.uk/id/eprint/436232
PURE UUID: b3a0873b-d25d-4f85-af9b-ab3e63f0db48

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Date deposited: 04 Dec 2019 17:30
Last modified: 01 Apr 2021 15:54

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