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

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.

Authors:

Publication type:
A1 Journal article – refereed

Place of publication:

Keywords:
5 ghz patch antenna, low-temperature cofiring, Microwave dielectric properties, spinel-olivine ceramics

Published:

Full citation:
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, https://doi.org/10.1016/j.apmt.2020.100826

DOI:
https://doi.org/10.1016/j.apmt.2020.100826

Read the publication here:
http://urn.fi/urn:nbn:fi-fe2020112793436