Enhanced Microwave Dielectric Properties and Sintering Behaviors of Mg<sub>2</sub>SiO<sub>4</sub>-Li<sub>2</sub>TiO<sub>3</sub>-LiF Ceramics by Adding CaTiO<sub>3</sub> for LTCC and GPS Antenna Applications
Zhijian Wang,
Feng Pan,
Lanlan Liu,
Qifeng Du,
Ruitao Tang,
Jun Ai,
Hong Zhang,
Ying Chen
Affiliations
Zhijian Wang
Lab of Dielectric Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Feng Pan
Jiaxing Key Laboratory of Flexible Electronics-Based Intelligent Sensing and Advanced Manufacturing Technology, Institute of Flexible Electronics Technology of THU, Jiaxing 314006, China
Lanlan Liu
Jiaxing Key Laboratory of Flexible Electronics-Based Intelligent Sensing and Advanced Manufacturing Technology, Institute of Flexible Electronics Technology of THU, Jiaxing 314006, China
Qifeng Du
Jiaxing Key Laboratory of Flexible Electronics-Based Intelligent Sensing and Advanced Manufacturing Technology, Institute of Flexible Electronics Technology of THU, Jiaxing 314006, China
Ruitao Tang
Jiaxing Key Laboratory of Flexible Electronics-Based Intelligent Sensing and Advanced Manufacturing Technology, Institute of Flexible Electronics Technology of THU, Jiaxing 314006, China
Jun Ai
Jiaxing Key Laboratory of Flexible Electronics-Based Intelligent Sensing and Advanced Manufacturing Technology, Institute of Flexible Electronics Technology of THU, Jiaxing 314006, China
Hong Zhang
Jiaxing Key Laboratory of Flexible Electronics-Based Intelligent Sensing and Advanced Manufacturing Technology, Institute of Flexible Electronics Technology of THU, Jiaxing 314006, China
Ying Chen
Lab of Dielectric Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
Mg2SiO4 holds promise for its application in the microwave communication field due to its low dielectric constant and high Q×f value. However, its high negative τf and high sintering temperature limit its application in low-temperature co-fired ceramic (LTCC) devices. In this work, Li2TiO3 and CaTiO3 were introduced to improve the τf, and LiF was chosen to decrease the sintering temperature. According to XRD patterns and SEM micrographs, the ceramic systems displayed a complex-phase structure, and the microstructure was densified when CaTiO3 was added. All of the relative densities, dielectric constants, and Q×f values first increased and then decreased as the sintering temperature increased. The MLLC11.5 ceramics sintered at 800 °C could be obtained with the highest Q×f value of 54,581 GHz (at 8.06 GHz), εr of 14.13, and τf of + 5.81 ppm/°C. Furthermore, it was proven that the MLLC11.5 powders could be co-fired without any reaction with Ag powders at 800 °C, indicating its potential for LTCC application. The MLLC11.5 composition was used to prepare a GPS antenna and showed good prospects for its application in electronic communications.
