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. 2022 May 27;22(11):4069. doi: 10.3390/s22114069

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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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Antenna characteristics for different n values expressed versus $W R$ while the axial length $L_{A}$ is kept constant (a) Radiation Resistance of the antenna on resonance frequency. The required $W R$ values to design a $50 Ω$ antenna are marked for $n = 3, \dots, 9$ (b) Resonance frequency normalized to $f_{D 2}$ .