Patent ID: 7529103

Claim:
A multi-layered printed circuit board embedded with a filter, the multi-layered printed circuit board using a composite multi-layered printed circuit board formed of at least a high dielectric material stacked with at least a low dielectric material, the composite multi-layered printed circuit board comprising: a substrate, a first metal layer being disposed on the substrate; a high dielectric material layer stacked on the first metal layer, a second metal layer being disposed on the high dielectric material layer; and; a first low dielectric material layer stacked on the second metal layer, a third metal layer being disposed on the first low dielectric material layer; wherein a plurality of serial or parallel capacitors are disposed in the composite multi-layered printed circuit board so as to form a filter, characterized in that at least one serial capacitor is an interdigital capacitor disposed on the third metal layer on the first low dielectric material, the interdigital capacitor having a plurality of digits on both electrodes using the third metal layer, wherein the interdigital capacitor is connected in serial to parallel-plate capacitors between the metal layers so as to form the embedded filter.