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. 2021 Jan 13;11:920. doi: 10.1038/s41598-020-79728-7

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© The Author(s) 2021

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(color online) Impedance functions value distribution in the radial direction for the original space of the concentrator. The solid red line corresponds to the ideal design case with the constant k = 1. The dotted purple, dash-dotted green and dashed blue lines correspond to the impedance-tunable design case with constants p = 1, p = 1.5, and p = 2, respectively.