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Journal of Advanced Ceramics 2024, 13(3): 293-309 https://doi.org/10.26599/JAC.2024.9220853
Research Article | Open Access | Issue | Published: 12 March 2024

Significantly improved near-field communication antennas based on novel Ho3+ and Co2+ ions co-doped Ni–Zn ferrites

Show Author's Information Pao Yang1,2,  Zhiqing Liu1,3,  Hongbin Qi1( ),  Xiuli Fu2,  Zhijian Peng1( )
School of Science, China University of Geosciences, Beijing 100083, China
School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
Kunshan GuoLi Electronic Technology Co., Ltd., Kunshan 215300, China
Keywords:
electromagnetic properties, co-doping, microstrip antennas, Ni–Zn ferrite
Cite this article:
Yang P, Liu Z, Qi H, et al. Significantly improved near-field communication antennas based on novel Ho3+ and Co2+ ions co-doped Ni–Zn ferrites. Journal of Advanced Ceramics, 2024, 13(3): 293-309. https://doi.org/10.26599/JAC.2024.9220853
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Abstract Full text About this article

In near-field communication (NFC) antennas, soft magnetic ferrites are usually applied as a substrate to reduce eddy current loss and increase magnetic field coupling. For this purpose, the applied ferrites are required to have high permeability and saturation magnetization together with low magnetic loss and dielectric loss. However, for most soft magnetic ferrites, it is difficult to meet all the requirements. Herein novel Ni–Zn ferrite ceramics co-doped by Ho3+ and Co2+ ions with chemical formula Ni0.5−xZn0.5Ho0.02CoxFe1.98O4 (x = 0–0.2) were designed and prepared to balance these needs on the basis of molten salt synthesis with metal nitrates as raw materials and potassium hydroxide (KOH) as the precipitation agent and molten salt precursor. After the substitution of Ho3+, the saturation magnetization and initial permeability decrease, but with further doping of Co2+, the saturation magnetization gradually increases, while the initial permeability continues to decrease. When x = 0.1, the sample will have the lowest dielectric constant, magnetic and dielectric loss, as well as the highest Curie temperature (305 ℃). Moreover, the acquired Ni–Zn ferrites have been applied simulatively in NFC antennas, revealing that the device manufactured with the optimal Ni0.4Zn0.5Ho0.02Co0.1Fe1.98O4 ferrite ceramics would have significantly improved performance at 13.56 MHz with low leakage and long transmit distance of magnetic field. Therefore, the Ni0.4Zn0.5Ho0.02Co0.1Fe1.98O4 ferrite ceramics would be a good candidate for NFC antenna substrates.


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About this article

Significantly improved near-field communication antennas based on novel Ho3+ and Co2+ ions co-doped Ni–Zn ferrites

Show Author's information Pao Yang1,2, Zhiqing Liu1,3, Hongbin Qi1( ), Xiuli Fu2, Zhijian Peng1( )
School of Science, China University of Geosciences, Beijing 100083, China
School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
Kunshan GuoLi Electronic Technology Co., Ltd., Kunshan 215300, China

Abstract

In near-field communication (NFC) antennas, soft magnetic ferrites are usually applied as a substrate to reduce eddy current loss and increase magnetic field coupling. For this purpose, the applied ferrites are required to have high permeability and saturation magnetization together with low magnetic loss and dielectric loss. However, for most soft magnetic ferrites, it is difficult to meet all the requirements. Herein novel Ni–Zn ferrite ceramics co-doped by Ho3+ and Co2+ ions with chemical formula Ni0.5−xZn0.5Ho0.02CoxFe1.98O4 (x = 0–0.2) were designed and prepared to balance these needs on the basis of molten salt synthesis with metal nitrates as raw materials and potassium hydroxide (KOH) as the precipitation agent and molten salt precursor. After the substitution of Ho3+, the saturation magnetization and initial permeability decrease, but with further doping of Co2+, the saturation magnetization gradually increases, while the initial permeability continues to decrease. When x = 0.1, the sample will have the lowest dielectric constant, magnetic and dielectric loss, as well as the highest Curie temperature (305 ℃). Moreover, the acquired Ni–Zn ferrites have been applied simulatively in NFC antennas, revealing that the device manufactured with the optimal Ni0.4Zn0.5Ho0.02Co0.1Fe1.98O4 ferrite ceramics would have significantly improved performance at 13.56 MHz with low leakage and long transmit distance of magnetic field. Therefore, the Ni0.4Zn0.5Ho0.02Co0.1Fe1.98O4 ferrite ceramics would be a good candidate for NFC antenna substrates.

Keywords: electromagnetic properties, co-doping, microstrip antennas, Ni–Zn ferrite

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Received: 24 September 2023
Revised: 21 December 2023
Accepted: 16 January 2024
Published: 12 March 2024
Issue date: March 2024

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© The Author(s) 2024.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 11674035 and 61274015) and the Fundamental Research Funds for the Central Universities.

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This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).

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