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Characterization of Knitted Coils for e-Textiles

Fobelets, K; Thielemans, K; Mathivanan, A; Papavassiliou, C; (2019) Characterization of Knitted Coils for e-Textiles. IEEE Sensors Journal , 19 (18) pp. 7835-7840. 10.1109/jsen.2019.2917542. Green open access

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Abstract

Inductor coils are integrated in many wearable garments for EM wave screening, heating and health monitoring. This paper presents a critical evaluation of the inductor characteristics of circular weft knitted coils for applications in etextiles. Inductors are knitted using circular needles with thin insulated metal wire and yarn knitted together. The resulting helical coils are characterized as a function of number of turns, coil diameter, needle size and insulated metal wire material. The results are compared to wound coils. Simulations of the knitted and wound coils show close agreement with the experimental results and confirm a higher inductance for the knits compared to the wound coils with the same pitch between turns. The parasitic coil capacitance is higher in the knit due to the vertical legs of the stitches, absent in wound coils. Knits with thin Cu and Litz wires result in flexible and wearable textile coils.

Type: Article
Title: Characterization of Knitted Coils for e-Textiles
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/jsen.2019.2917542
Publisher version: https://doi.org/10.1109/jsen.2019.2917542
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Flexible coils, smart textiles, circular weft knit.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Medicine
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Medicine > Department of Imaging
URI: https://discovery.ucl.ac.uk/id/eprint/10080307
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