Effect of frit size on microwave properties of glass–ceramic in low temperature co-fired ceramics

For low temperature co-fired ceramics (LTCC) materials, glass–ceramic composites consisting of a BaNd2Ti5O14 ceramic and the lead-free rare earth derived boron glasses (L glass) were tested with different frit size. The glass–ceramic composites were evaluated for thermal properties and microwave dielectric properties (ɛr, Qf0: quality factor). At low temperature, the sintered body demonstrated applicable properties such as high relative density of over 80% and various dielectric properties, namely, 17–20 for ɛr and 3376–10,000 GHz for Qf0. The results suggest that the microwave properties are controlled by frit size for low temperature co-fired ceramic compositions at high-frequency application.