A lead borosilicate (PBS) glass-Al 2 O 3 composite was prepared and its microwave dielectric properties were investigated. Although the anorthite-type phase was observed above 800 o C, this phase might have crystallized from the PBS glass because the PBS glass originally contained the constituents of the anorthite phase and a one-stage sintering behavior was conducted. The densification behavior was suggested to occur through a non-reactive liquid phase sintering. The dielectric constant ( ε r ), the quality factor (Q × f 0 ), and the temperature coefficient of the resonant frequency ( τ f ) of the 50 vol% PBS glass-Al 2 O 3 composite sintered at 900 o C were 9.26, 4 941 GHz, and − 38 ppm/K, respectively.

Keywords: LTCC, Glass-Ceramic, Al 2 O 3 , Lead borosilicate, Composite.