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Broadband low-loss on-body UHF to millimeter-wave surface wave links using flexible textile single wire transmission lines

Broadband low-loss on-body UHF to millimeter-wave surface wave links using flexible textile single wire transmission lines
Broadband low-loss on-body UHF to millimeter-wave surface wave links using flexible textile single wire transmission lines
On-body transmission represents a challenge due to human body shadowing. This paper proposes a Sommerfeld-Goubau single-wire transmission line (SWTL) implemented using electronic textiles for low-loss on-body links up to millimeter-wave frequencies, overcoming the spherical spreading loss and on-body absorption. The SWTL is fabricated using a conductive thread suitable for embroidery on textiles. A compact tapered launcher is implemented on a flexible polyimide substrate to excite the surface mode along the SWTL. In space, a 3 m-long line maintains a forward transmission over -10 dB between 1 and 3 GHz. The SWTL link is characterized for different body parts showing under 20 dB insertion loss with a 1 cm air gap. Across the torso, a forward transmission over -20 dB is maintained from 0.5 to 2.5 GHz, which represents at least 20 dB improvement over two antennas, of larger dimensions, over-the-air. Directly on-skin, the SWTL can be used around 1 GHz with an S21 over -25 dB, over 50 dB improvement over two on-skin antennas. At 50 GHz, the shielded SWTL exhibits an ultra-low on-body attenuation around 0.11 dB/mm, a four-fold improvement over a microstrip line on the same substrate. It is concluded that SWTLs can enable ultra high-speed future body area networks.
5G e-textiles, Metamaterial, RF textiles, RF transmission, SWTL, Sommerfeld Gobau Line, Surface wave transmission line, body-centric communications, coplanar waveguides, e-textiles, embroidered transmission line, goubau line, millimeter wave textiles, millimeter wave wearables, mmWave, mmWave lines, mmWave textile antennas, on-body antenna, on-body communication, on-body low-loss transmission, on-body transmission, printed RF electronics, single wire transmission line, spoof surface plasmons, surface waves, textile antennas, textile metamaterials, textile transmission lines, transmission lines, wearables
2637-6431
101-111
Wagih, Mahmoud
7e7b16ba-0c64-4f95-bd3c-99064055f693
Wagih, Mahmoud
7e7b16ba-0c64-4f95-bd3c-99064055f693

Wagih, Mahmoud (2022) Broadband low-loss on-body UHF to millimeter-wave surface wave links using flexible textile single wire transmission lines. IEEE Open Journal of Antennas and Propagation, 3, 101-111. (doi:10.1109/OJAP.2021.3136654).

Record type: Article

Abstract

On-body transmission represents a challenge due to human body shadowing. This paper proposes a Sommerfeld-Goubau single-wire transmission line (SWTL) implemented using electronic textiles for low-loss on-body links up to millimeter-wave frequencies, overcoming the spherical spreading loss and on-body absorption. The SWTL is fabricated using a conductive thread suitable for embroidery on textiles. A compact tapered launcher is implemented on a flexible polyimide substrate to excite the surface mode along the SWTL. In space, a 3 m-long line maintains a forward transmission over -10 dB between 1 and 3 GHz. The SWTL link is characterized for different body parts showing under 20 dB insertion loss with a 1 cm air gap. Across the torso, a forward transmission over -20 dB is maintained from 0.5 to 2.5 GHz, which represents at least 20 dB improvement over two antennas, of larger dimensions, over-the-air. Directly on-skin, the SWTL can be used around 1 GHz with an S21 over -25 dB, over 50 dB improvement over two on-skin antennas. At 50 GHz, the shielded SWTL exhibits an ultra-low on-body attenuation around 0.11 dB/mm, a four-fold improvement over a microstrip line on the same substrate. It is concluded that SWTLs can enable ultra high-speed future body area networks.

Text
Wagih21_OJAP_SWTL_Textile - Accepted Manuscript
Available under License Creative Commons Attribution.
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More information

Submitted date: 14 December 2021
Accepted/In Press date: 16 December 2021
Published date: 1 January 2022
Keywords: 5G e-textiles, Metamaterial, RF textiles, RF transmission, SWTL, Sommerfeld Gobau Line, Surface wave transmission line, body-centric communications, coplanar waveguides, e-textiles, embroidered transmission line, goubau line, millimeter wave textiles, millimeter wave wearables, mmWave, mmWave lines, mmWave textile antennas, on-body antenna, on-body communication, on-body low-loss transmission, on-body transmission, printed RF electronics, single wire transmission line, spoof surface plasmons, surface waves, textile antennas, textile metamaterials, textile transmission lines, transmission lines, wearables

Identifiers

Local EPrints ID: 453169
URI: http://eprints.soton.ac.uk/id/eprint/453169
ISSN: 2637-6431
PURE UUID: cdf38f68-01e4-4ac7-8028-d15e2a61963c
ORCID for Mahmoud Wagih: ORCID iD orcid.org/0000-0002-7806-4333

Catalogue record

Date deposited: 10 Jan 2022 17:51
Last modified: 25 Jun 2022 02:03

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Contributors

Author: Mahmoud Wagih ORCID iD

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