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. 2020 Jan 23;11:444. doi: 10.1038/s41467-020-14311-2

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a Photograph of near-field-enabled long-sleeved shirt comprised of a network with a single hub and eight terminals. b Configuration of the near-field relay when interconnecting a wireless reader with a sensor node. c Circuit model of the relay system in b. d Power transfer efficiency η as a function of relay length l. The geometrical parameters are r = 1.7 cm, N = 10, g = 0.1 cm, h = 1 cm, and w = 0 cm. e Normalised magnetic field amplitude ∣H_abs∣ above relays with straight and serpentine interconnects. f Magnetic field generated by designs (1) partial circular (7.2 cm diameter), (2) rectangular (10 cm length, 4 cm width) and (3) filled circular (10 cm diameter, 70% area filling ratio). Designs (1) and (2) have a area filling ratio of ~38%. g Magnetic field profiles along the dashed white lines in f. h Magnetic field above relays with multiple terminals connected in parallel. l = 30 cm between the hub and each terminal. i Power transfer efficiency η as a function of the total number of terminals connected either in parallel or in series. Error bars show mean ± s.d. (n = number of terminals).