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Overcoming the efficiency barrier of textile antennas: a transmission lines approach

Overcoming the efficiency barrier of textile antennas: a transmission lines approach
Overcoming the efficiency barrier of textile antennas: a transmission lines approach
Designing high-efficiency antennas on textiles is fundamental to developing wirelessly-connected smart garments. Furthermore, large antenna arrays could be used to receive or harvest directional and ambient radio-frequency (RF) power from the environment enabling battery-free e-textiles. The key challenges hindering the realisation of high efficiency antennas lie in the dielectric properties of fabrics, the conductivity of the traces and the low textile thickness. This work numerically and experimentally analyses different RF transmission line structures to establish the limitations of widely utilised antenna designs, such as the microstrip patch, and proposes alternative wearable antenna design based on coplanar waveguide (CPW) structures. It is demonstrated that using a CPW, insertion losses in a 20 mm line can be minimized by up to 40% for the same substrate, compared to a microstrip, at 30 GHz. A CPW monopole antenna is demonstrated with more than 80% efficiency on a lossy, thin, poly-cotton substrate. Moreover, it is shown that the efficiency of the CPW monopole is independent of the substrate’s thickness and type of fabric.
2504-3900
1-5
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 (2019) Overcoming the efficiency barrier of textile antennas: a transmission lines approach. Proceedings, 32 (1), 1-5. (doi:10.3390/proceedings2019032018).

Record type: Article

Abstract

Designing high-efficiency antennas on textiles is fundamental to developing wirelessly-connected smart garments. Furthermore, large antenna arrays could be used to receive or harvest directional and ambient radio-frequency (RF) power from the environment enabling battery-free e-textiles. The key challenges hindering the realisation of high efficiency antennas lie in the dielectric properties of fabrics, the conductivity of the traces and the low textile thickness. This work numerically and experimentally analyses different RF transmission line structures to establish the limitations of widely utilised antenna designs, such as the microstrip patch, and proposes alternative wearable antenna design based on coplanar waveguide (CPW) structures. It is demonstrated that using a CPW, insertion losses in a 20 mm line can be minimized by up to 40% for the same substrate, compared to a microstrip, at 30 GHz. A CPW monopole antenna is demonstrated with more than 80% efficiency on a lossy, thin, poly-cotton substrate. Moreover, it is shown that the efficiency of the CPW monopole is independent of the substrate’s thickness and type of fabric.

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e-pub ahead of print date: 12 November 2019
Published date: 11 December 2019
Venue - Dates: International Conference on the Challenges, Opportunities, Innovations and Applications in Electronic Textiles (E-TEXTILES 2019), , London, United Kingdom, 2019-11-12 - 2019-11-12

Identifiers

Local EPrints ID: 435224
URI: http://eprints.soton.ac.uk/id/eprint/435224
ISSN: 2504-3900
PURE UUID: 86fe8d31-a33b-405a-b8e0-aa9a242ef1df
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

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Date deposited: 28 Oct 2019 17:30
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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