Micorwave dielectric properties ofglass/ceramics matrix composites for low temperature co-fired ceramics

초록

The low temperature co-fired ceramic (LTCC) technology is a multi-layer ceramic process that can be used to fabricate low cost, high performance RF and microwave components. The LTCC technology demands of lowering the sintering temperature Tsin<900℃ of the dielectric materials as using low melted electrode materials such as silver (Tm: 961℃), which possess low resistance on electric circuits. In this study, ceramics in the BaO-Nd2O3-TiO2 (BNT: 40-20wt%) system and rare earth derived borate glass (LBT: 60-80wt%, 1.5-6㎛) were prepared as using the glass/ceramic matrix. The glass/ceramic composites were evaluated for sintering behavior, phase evaluation densities, interface reaction and microwave dielectric properties. It was found that the addition LBT glass frits significantly lowered the sintering temperature to below 900℃ as well as the densification was developed rapidly which was meant to be as over 90% of relative density during the crystallization. The sintered bodies represented applicable dielectric properties, namely 15-20 for εr, ~10000GHz for Q×f0. The results suggest that the composites have a good potential for the microwave application with low temperature co-fired ceramic technology.