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Broadband compact substrate-independent textile wearable antenna for simultaneous near- and far-field wireless power transmission

Broadband compact substrate-independent textile wearable antenna for simultaneous near- and far-field wireless power transmission
Broadband compact substrate-independent textile wearable antenna for simultaneous near- and far-field wireless power transmission
Despite an increasing interest in wearable Wireless Power Transmission (WPT), until now, wearable antennas have been unable to simultaneously harvest from near-field resonant and far-field radiative WPT. Here, a dual-port antenna is proposed, integrating an inductive coil with a broadband monopole for near- and far-field wearable WPT. The coil acts simultaneously as a High Frequency (HF) near-field power receiver and an Ultra-High Frequency (UHF) resonator, enabling the miniaturization of the enclosed broadband monopole, both fabricated using all-textile conductors. On-body, the antenna maintains a 10 dB return loss over a measured 135% fractional bandwidth while maintaining compactness (0.312×0.312 λ2). The antenna is substrate-independent and is demonstrated on two textile substrates with different dielectric properties and thicknesses. In far-field mode, the rectenna maintains over 40% efficiency from sub-1 µW/cm2 power densities. In the near-field, a WPT efficiency up to 80% can be achieved. The simulated Specific Absorption Rate (SAR) shows up to 40 and 20 dBm power reception for HF and UHF operation, respectively, without exceeding the 1.7 W/kg limit. The far-field wearable rectenna is demonstrated powering a Bluetooth Low Energy node using a BQ25504 DC-DC converter from a best-in-class low power density of 0.88 and 0.55 µW/cm2 on-body and in-space, respectively.
Antennas, Body area networks, Coils, Inductors, NFC, RFID, Rectennas, Rectifiers
2637-6431
398 - 411
Wagih, Mahmoud
7e7b16ba-0c64-4f95-bd3c-99064055f693
Komolafe, Abiodun
5e79fbab-38be-4a64-94d5-867a94690932
Weddell, Alex S.
3d8c4d63-19b1-4072-a779-84d487fd6f03
Beeby, Steve
ba565001-2812-4300-89f1-fe5a437ecb0d
Wagih, Mahmoud
7e7b16ba-0c64-4f95-bd3c-99064055f693
Komolafe, Abiodun
5e79fbab-38be-4a64-94d5-867a94690932
Weddell, Alex S.
3d8c4d63-19b1-4072-a779-84d487fd6f03
Beeby, Steve
ba565001-2812-4300-89f1-fe5a437ecb0d

Wagih, Mahmoud, Komolafe, Abiodun, Weddell, Alex S. and Beeby, Steve (2022) Broadband compact substrate-independent textile wearable antenna for simultaneous near- and far-field wireless power transmission. IEEE Open Journal of Antennas and Propagation, 3, 398 - 411. (doi:10.1109/OJAP.2022.3167089).

Record type: Article

Abstract

Despite an increasing interest in wearable Wireless Power Transmission (WPT), until now, wearable antennas have been unable to simultaneously harvest from near-field resonant and far-field radiative WPT. Here, a dual-port antenna is proposed, integrating an inductive coil with a broadband monopole for near- and far-field wearable WPT. The coil acts simultaneously as a High Frequency (HF) near-field power receiver and an Ultra-High Frequency (UHF) resonator, enabling the miniaturization of the enclosed broadband monopole, both fabricated using all-textile conductors. On-body, the antenna maintains a 10 dB return loss over a measured 135% fractional bandwidth while maintaining compactness (0.312×0.312 λ2). The antenna is substrate-independent and is demonstrated on two textile substrates with different dielectric properties and thicknesses. In far-field mode, the rectenna maintains over 40% efficiency from sub-1 µW/cm2 power densities. In the near-field, a WPT efficiency up to 80% can be achieved. The simulated Specific Absorption Rate (SAR) shows up to 40 and 20 dBm power reception for HF and UHF operation, respectively, without exceeding the 1.7 W/kg limit. The far-field wearable rectenna is demonstrated powering a Bluetooth Low Energy node using a BQ25504 DC-DC converter from a best-in-class low power density of 0.88 and 0.55 µW/cm2 on-body and in-space, respectively.

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Wagih_OJAP22_DMode_NearFar_WPT_Rectenna - Version of Record
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Accepted/In Press date: 6 April 2022
Published date: 13 April 2022
Additional Information: Funding Information: This work was supported in part by the U.K. Engineering and Physical Sciences Research Council (EPSRC) under Grant EP/P010164/1, and in part by the European Commission through the EnABLES Project under Grant 730957. The work of Mahmoud Wagih was supported by the U.K. Royal Academy of Engineering and the Office of the Chief Science Adviser for National Security under the U.K. Intelligence Community Post-Doctoral Research Fellowship Programme. Publisher Copyright: © 2020 IEEE.
Keywords: Antennas, Body area networks, Coils, Inductors, NFC, RFID, Rectennas, Rectifiers

Identifiers

Local EPrints ID: 456754
URI: http://eprints.soton.ac.uk/id/eprint/456754
ISSN: 2637-6431
PURE UUID: b1932c24-6fb7-45ed-ac4a-aad279ab875c
ORCID for Mahmoud Wagih: ORCID iD orcid.org/0000-0002-7806-4333
ORCID for Abiodun Komolafe: ORCID iD orcid.org/0000-0002-3618-2390
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: 10 May 2022 16:51
Last modified: 22 Apr 2024 17:17

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Contributors

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

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