University of Oulu

Huaicheng Xiang, Joni Kilpijärvi, Sami Myllymäki, Haitao Yang, Liang Fang, Heli Jantunen, Spinel-olivine microwave dielectric ceramics with low sintering temperature and high quality factor for 5 GHz wi-fi antennas, Applied Materials Today, Volume 21, 2020, 100826, ISSN 2352-9407,

Spinel-olivine microwave dielectric ceramics with low sintering temperature and high quality factor for 5 GHz wi-fi antennas

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Author: Xiang, Huaicheng1,2,3; Kilpijärvi, Joni3; Myllymäki, Sami3;
Organizations: 1Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, P. R. China
2Shenzhen Key Laboratory of Special Functional Materials, Shenzhen Engineering Laboratory for Advanced Technology of Ceramics, Guangdong Research Center for Interfacial Engineering of Functional Materials, College of Materials Science and Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, P. R. China
3Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, FI-90014 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.9 MB)
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Language: English
Published: Elsevier, 2020
Publish Date: 2022-09-20


The patch antenna of spinel-olivine composite ceramic (Li2ZnGe3O8-Li2ZnGeO4) is designed, which can realize power ratio (59%) and S11 of -14 dB at 5.7 GHz. The low sintering temperature (< 960 °C), low relative permittivity (8.15) and good microwave dielectric properties (quality factor ~ 32,500 GHz, resonant frequency temperature coefficient ~ -74.8 ppm/ °C) were obtained for spinel-olivine composite ceramic. Li2ZnGe3O8-Li2ZnGeO4 composite microwave dielectric ceramics were synthesized at 900–980 °C using Li2CO3, ZnO and GeO2, which can co-fire with silver electrodes without chemical reaction. These exceptional characteristics enable high-speed signal transmission application of spinel-olivine composite ceramics (Li2ZnGe3O8-Li2ZnGeO4) in 5 GHz Wi-Fi antennas.

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Series: Applied materials today
ISSN: 2352-9407
ISSN-E: 2352-9415
ISSN-L: 2352-9407
Volume: 21
Article number: 100826
DOI: 10.1016/j.apmt.2020.100826
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
213 Electronic, automation and communications engineering, electronics
Funding: The authors gratefully acknowledge the financial support from the Shenzhen Basic Research General Program (Award No. JCYJ20190808114618998), the National Natural Science Foundation of China (Award Nos. 21965009, 21761008 and 21561008) and the Natural Science Foundation of Guangxi Zhuang Autonomous Region (Award Nos. 2018GXNSFAA138175, 2018GXNSFBA281093, 2015GXNSFFA139003, and 2018GXNSFAA281093). H. Xiang and H. Jantunen acknowledge the financial support from the European Research Council Project (Award No. 24001893).
Copyright information: © 2020 Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license