Capacitor built-in type substrate

摘要

A capacitor built-in type substrate includes a capacitor layer (10) built-in the substrate. The capacitor layer (10) consists of a dielectric layer of aluminum nitride ceramic in which electro-conductive particles are dispersed so that a content of electro-conductive particles dispersed in the dielectric layer is in a range of 5% to 20% by volume. The electro-conductive particles may be nitrides, carbides, or metal.