Low-temperature co fired ceramic materials with three different dielectric constants

A new type of low-temperature co fired ceramic (LTCC) material with a medium dielectric constant was developed in this study (MK, r = 20.9). MK can be co fired with a high-dielectric-constant material (HK, r = 44.5) and a low-dielectric-constant material (LK, r = 8.1) previously reported. Glass and ceramic materials similar to HK and LK were used. The compositions of glass and ceramic materials for MK were designed to set the adequate dielectric constant and low-temperature coefficient of the dielectric constant (τ r). The coefficient of thermal expansion (CTE) was matched with those of both the previous materials. MK was confirmed to match well electrically with both the previous materials, had no mechanical defects, and showed minimal inter diffusion. With the addition of MK, the three types of LTCC material system contribute to the enhancement of the performance and the downsizing of electronic components for high-frequency communication.