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Analyzing and maximizing the power harvesting efficiency of a textile rectenna through reflector-based shielding

Analyzing and maximizing the power harvesting efficiency of a textile rectenna through reflector-based shielding
Analyzing and maximizing the power harvesting efficiency of a textile rectenna through reflector-based shielding
Wearable rectennas harvest power from off-body sources; shielding mechanisms such as microstrip antennas' ground planes are typically used to reduce absorption by the body. This work investigates the use of unconnected reflectors to improve textile rectennas' harvesting capabilities. A high-efficiency rectenna using a textile-based rectifier, achieving over 40% RF-DC efficiency from −20 dBm power, and a monopole is investigated with different clothing layers in the presence and absence of a reflector. It is shown that a textile reflector can improve the DC output of a rectenna, on an external clothing layer, by over 100% through improving the measured gain by 2.4 dB. However, for rectennas with less than 2.0 mm clearance from the body, a reflector can have detrimental effect on the rectenna. The proposed reflector-backed rectenna achieves a wearable harvesting efficiency of 40%, from an ultra-low power density of 0.3 μW/cm 2, demonstrating significant sensitivity improvement over state-of-the-art rectennas.
Antenna, Electronic Textile, RF Energy Harvesting, Rectifier, Wireless Power Transfer
IEEE
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 (2021) Analyzing and maximizing the power harvesting efficiency of a textile rectenna through reflector-based shielding. In 15th European Conference on Antennas and Propagation, EuCAP 2021. IEEE.. (doi:10.23919/EuCAP51087.2021.9411484).

Record type: Conference or Workshop Item (Paper)

Abstract

Wearable rectennas harvest power from off-body sources; shielding mechanisms such as microstrip antennas' ground planes are typically used to reduce absorption by the body. This work investigates the use of unconnected reflectors to improve textile rectennas' harvesting capabilities. A high-efficiency rectenna using a textile-based rectifier, achieving over 40% RF-DC efficiency from −20 dBm power, and a monopole is investigated with different clothing layers in the presence and absence of a reflector. It is shown that a textile reflector can improve the DC output of a rectenna, on an external clothing layer, by over 100% through improving the measured gain by 2.4 dB. However, for rectennas with less than 2.0 mm clearance from the body, a reflector can have detrimental effect on the rectenna. The proposed reflector-backed rectenna achieves a wearable harvesting efficiency of 40%, from an ultra-low power density of 0.3 μW/cm 2, demonstrating significant sensitivity improvement over state-of-the-art rectennas.

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More information

Accepted/In Press date: 2021
e-pub ahead of print date: 27 April 2021
Published date: 27 April 2021
Venue - Dates: 2021 15th European Conference on Antennas and Propagation (EuCAP), , Dusseldorf, Germany, 2021-03-22 - 2021-03-26
Keywords: Antenna, Electronic Textile, RF Energy Harvesting, Rectifier, Wireless Power Transfer

Identifiers

Local EPrints ID: 446365
URI: http://eprints.soton.ac.uk/id/eprint/446365
PURE UUID: 7fdc4dd7-8a0d-44f1-9d1a-c394e2ac1f9f
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: 05 Feb 2021 17:31
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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