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. 2022 Jan 10;13:72. doi: 10.1038/s41467-021-27733-3

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Fig. 4 — a Dimension of the designed planar coil acting as NFC antenna. b, c 3D surface images of the printed flexible tag measured by the optical profilometer. d Example of the 2D profile of one inductor track showing the printed track height. e Normalized coupling factor as a function of the distance between coils numerically calculated, showing the separation intervals where the tag is ON or OFF. f Reading distance as a function of the bending angle.