Microwave dielectric properties of glass-MCT low temperature co-firable ceramics

Interaction between the (Mg0.95Ca0.05)TiO3 (MCT) microwave dielectric materials and BaBSiO glass materials was examined. Rigorous interaction occurs when the MCT-glass composite materials were densified at 800–900 °C, which, fortunately, does not seriously degrade the microwave dielectric properties of the materials such that dielectric constant (K)=8–10 was achieved for MCT-glass composite materials, no matter whether they were in pellet or tape form. The MCT–glass composites with MCT–BaBSiO=50:50 (vol.%) possess low shrinkage characteristics, when densified at 800–900 °C for 10 min, and were used as constrain layer for an LTCC sandwich. LTCC tapes possessing very small x–y shrinkage (≦0.05%) and good microwave properties (k=8.0 ) are thus synthesized.