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. 2022 Jan 20;22(3):787. doi: 10.3390/s22030787

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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The calculated (a) and measured (b) PCE of the voltage doubler RF–DC converter as a function of $C_{1}$ values and input signal power for $L = 17 nH .$ PCE is represented by color. Size of the circle represents the number of subcarriers (4, 8, 16, 32, 64, 128, 256), the smallest is for 4 carriers and the largest—for 256 carriers.