Cold sintered, temperature-stable CaSnSiO5-K2MoO4 composite microwave ceramics and its prototype microstrip patch antenna

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 and Raman spectroscopy confirmed that CSSO KMO coexisted without intermediate phases. As weight fraction increased, relative permittivity (er) temperature coefficient of resonant frequency (τf) decreased microwave quality factor (Q×f, where f is frequency) increased. Near-zero τf (-0.5 ppm/°C) was obtained 65 wt%CSSO-35 wt%KMO with er ∼ 9.2 Q×f 6240 GHz. No chemical reaction between ceramic composites silver observed, demonstrating potential cofiring Ag-paste. A prototype antenna from a bandwidth 144 MHz @ -10 dB, gain 5.7 dBi total efficiency 88.4 % 5.2 GHz, suitable 5 G mobile communication systems.