Reliable UHF long-range textile-integrated RFID tag based on a compact flexible antenna filament

Wagih, M., Wei, Y. ORCID: 0000-0001-6195-8595, Komolafe, A., Torah, R. and Beeby, S., 2020. Reliable UHF long-range textile-integrated RFID tag based on a compact flexible antenna filament. Sensors, 20 (12): 3435. ISSN 1424-8220

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This paper details the design, fabrication and testing of flexible textile-concealed RFID tags 1 for wearable applications in a smart city/ smart building environment. The proposed tag designs aim 2 to reduce the overall footprint, enabling textile integration whilst maintaining the read range. The 3 proposed RFID filament is less than 3.5 mm in width and 100 mm in length. The tag is based on an 4 electrically small (0.0033λ 2) high-impedance planar dipole antenna with a tuning loop, maintaining a 5 reflection coefficient less than −21 dB at 915 MHz, when matched to a commercial RFID chip mounted 6 alongside the antenna. The antenna strip and the RFID chip are then encapsulated and integrated in 7 a standard woven textile for wearable applications. The flexible antenna filament demonstrates a 1.8 8 dBi gain which shows a close agreement with the analytically calculated and numerically simulated 9 gains. The range of the fabricated tags has been measured and a maximum read range of 8.2 m was 10 recorded at 868 MHz. Moreover, the tag's maximum calculated range at 915 MHz is 18 m, which 11 is much longer than the commercially available laundry tags of larger length and width, such as 12 Invengo RFID tags. The reliability of the proposed RFID tags has been investigated using a series 13 of tests replicating textile-based use case scenarios which demonstrates its suitability for practical 14 deployment. Washing tests have shown that the textile-integrated encapsulated tags can be read after 15 over 32 washing cycles, and that multiple tags can be read simultaneously while being washed.

Item Type: Journal article
Publication Title: Sensors
Creators: Wagih, M., Wei, Y., Komolafe, A., Torah, R. and Beeby, S.
Publisher: MDPI AG
Date: 17 June 2020
Volume: 20
Number: 12
ISSN: 1424-8220
Rights: c. 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
Divisions: Schools > School of Science and Technology
Record created by: Linda Sullivan
Date Added: 09 Sep 2020 14:40
Last Modified: 31 May 2021 15:17

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