LOW TEMPERATURE CO-FIRED CERAMICS WITH BUFFER LAYER AND METHOD OF MANUFACTURING THE SAME

摘要

A low temperature co-fired ceramic substrate with a buffer layer and a method for manufacturing the same are provided to prevent a crack in a ceramic layer with a low intensity when forming heterojuntion between ceramic layers with different coefficient of thermal expansion. A first ceramic layer(111) has a first coefficient of thermal expansion of 12 to 13 and a high dielectric constant. A second ceramic layer(112) has a second coefficient of thermal expansion of 5 to 10 and a low dielectric constant. A buffer layer(110) is composed of a first region(111') and a second region(112') and is interposed between the first ceramic layer and the second ceramic layer for preventing the crack in a heterojunction of the firs ceramic layer and the second ceramic layer. A plurality of electrode patterns(130) are formed around the ceramic layers to form a penetrating via(120) penetrating the ceramic layers and a buffer layer and a capacitor, and are connected to a penetrating via.