Cold sintered,temperature-stable CaSnSiO5-K2MoO4 composite microwave ceramics and its prototype microstrip patch antenna |
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| Authors: | Yuping Ji Kaixin Song Shiyu Zhang Zhilun Lu Ge Wang Linhao Li Di Zhou Dawei Wang Ian M Reaney |
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| Affiliation: | 1. College of Electronics Information, Hangzhou Dianzi University, Hangzhou, 310018, China;2. Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JD, UK;3. Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, LE11 3TU, UK;4. The Henry Royce Institute, Sir Robert Hadfield Building, Sheffield, S1 3JD, UK;5. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, Shaanxi, China |
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| Abstract: | Dense (1-x)wt%CaSnSiO5-xwt%K2MoO4 (CSSO-KMO) composite ceramics were fabricated by the cold sintering process at 180 °C under 400 MPa for 60 min. X-ray diffraction, Energy dispersive X-ray and Raman spectroscopy confirmed that CSSO and KMO coexisted without intermediate phases. As KMO weight fraction increased, relative permittivity (εr) and temperature coefficient of resonant frequency (τf) decreased and the microwave quality factor (Q×f, where f is resonant frequency) increased. Near-zero τf (-0.5 ppm/°C) was obtained for 65 wt%CSSO-35 wt%KMO with εr ～ 9.2 and Q×f ～ 6240 GHz. No chemical reaction between ceramic composites and silver was observed, demonstrating potential for cofiring with Ag-paste. A prototype antenna was fabricated from 65 wt%CSSO-35 wt%KMO composite ceramic with a bandwidth of 144 MHz @ -10 dB, a gain of 5.7 dBi and a total efficiency of 88.4 % at 5.2 GHz, suitable for 5 G mobile communication systems. |
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| Keywords: | Microwave dielectric Cold sintering process Microstrip patch antenna |
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