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Crystal structure, microwave dielectric properties, and dielectric resonant antenna studies of novel low-permittivity CoAl(2)O(4) spinel ceramics

CoAl(2)O(4) spinel ceramics were prepared via a standard solid-state reaction method, and their crystal structure, microwave dielectric properties, and dielectric resonant antenna applications were systematically investigated in this study. X-Ray diffraction patterns and Raman spectra confirmed that...

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Detalles Bibliográficos
Autores principales: Ding, Yi, Hu, Cheng Chao, Sheng, Wei Qin, Song, Kai Xin, Liu, Bing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8366490/
http://dx.doi.org/10.1007/s10854-021-06760-2
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author Ding, Yi
Hu, Cheng Chao
Sheng, Wei Qin
Song, Kai Xin
Liu, Bing
author_facet Ding, Yi
Hu, Cheng Chao
Sheng, Wei Qin
Song, Kai Xin
Liu, Bing
author_sort Ding, Yi
collection PubMed
description CoAl(2)O(4) spinel ceramics were prepared via a standard solid-state reaction method, and their crystal structure, microwave dielectric properties, and dielectric resonant antenna applications were systematically investigated in this study. X-Ray diffraction patterns and Raman spectra confirmed that CoAl(2)O(4) belongs to the Fd-3 m space group with cubic crystal symmetry. ε(r) and Qf values increased with the increasing sintering temperature, where an ever-improving microstructure was also observed from the scanning electron micrographs. The optimal microwave dielectric properties were achieved as follows: ε(r) = 9.34, Qf = 30,500 GHz, and τ(f) = −54 ppm/(°)C. Moreover, a dielectric resonant antenna was designed and simulated to demonstrate the application prospects of CoAl(2)O(4) ceramics towards microwave antennas. The CoAl(2)O(4)-based antenna resonating at 14.33 GHz exhibited a high return loss of −40.9 dB, a wide impedance bandwidth of 940 MHz, and an exceptionally high total efficiency of 96.6%. The remarkable antenna performances suggested that CoAl(2)O(4) ceramics were promising candidates for wireless communication devices operating at the Ku-band, provided τ(f) can be further tuned toward zero.
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spelling pubmed-83664902021-08-17 Crystal structure, microwave dielectric properties, and dielectric resonant antenna studies of novel low-permittivity CoAl(2)O(4) spinel ceramics Ding, Yi Hu, Cheng Chao Sheng, Wei Qin Song, Kai Xin Liu, Bing J Mater Sci: Mater Electron Article CoAl(2)O(4) spinel ceramics were prepared via a standard solid-state reaction method, and their crystal structure, microwave dielectric properties, and dielectric resonant antenna applications were systematically investigated in this study. X-Ray diffraction patterns and Raman spectra confirmed that CoAl(2)O(4) belongs to the Fd-3 m space group with cubic crystal symmetry. ε(r) and Qf values increased with the increasing sintering temperature, where an ever-improving microstructure was also observed from the scanning electron micrographs. The optimal microwave dielectric properties were achieved as follows: ε(r) = 9.34, Qf = 30,500 GHz, and τ(f) = −54 ppm/(°)C. Moreover, a dielectric resonant antenna was designed and simulated to demonstrate the application prospects of CoAl(2)O(4) ceramics towards microwave antennas. The CoAl(2)O(4)-based antenna resonating at 14.33 GHz exhibited a high return loss of −40.9 dB, a wide impedance bandwidth of 940 MHz, and an exceptionally high total efficiency of 96.6%. The remarkable antenna performances suggested that CoAl(2)O(4) ceramics were promising candidates for wireless communication devices operating at the Ku-band, provided τ(f) can be further tuned toward zero. Springer US 2021-08-16 2021 /pmc/articles/PMC8366490/ http://dx.doi.org/10.1007/s10854-021-06760-2 Text en © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2021 This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.
spellingShingle Article
Ding, Yi
Hu, Cheng Chao
Sheng, Wei Qin
Song, Kai Xin
Liu, Bing
Crystal structure, microwave dielectric properties, and dielectric resonant antenna studies of novel low-permittivity CoAl(2)O(4) spinel ceramics
title Crystal structure, microwave dielectric properties, and dielectric resonant antenna studies of novel low-permittivity CoAl(2)O(4) spinel ceramics
title_full Crystal structure, microwave dielectric properties, and dielectric resonant antenna studies of novel low-permittivity CoAl(2)O(4) spinel ceramics
title_fullStr Crystal structure, microwave dielectric properties, and dielectric resonant antenna studies of novel low-permittivity CoAl(2)O(4) spinel ceramics
title_full_unstemmed Crystal structure, microwave dielectric properties, and dielectric resonant antenna studies of novel low-permittivity CoAl(2)O(4) spinel ceramics
title_short Crystal structure, microwave dielectric properties, and dielectric resonant antenna studies of novel low-permittivity CoAl(2)O(4) spinel ceramics
title_sort crystal structure, microwave dielectric properties, and dielectric resonant antenna studies of novel low-permittivity coal(2)o(4) spinel ceramics
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8366490/
http://dx.doi.org/10.1007/s10854-021-06760-2
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