Patent ID: 6696905
Filing Date: 2004-02-24
Classification: H01P

Abstract:
A dielectric filter device comprising a dielectric block generally in the form of a rectangular parallelepiped and having a plurality of hollow bores formed therein and openings of the bores in an upper surface of the block, electrically conductive layers respectively covering a lower surface opposed to the upper surface, an outer peripheral side surface parallel to axes of the bores, inner peripheral surfaces defining the respective bores and the upper surface around the bore openings, and a plurality of electrodes separate from the conductive layers for connection to external devices, the filter device being characterized in that first bore opening portions are arranged between the first electrode formed on the upper surface or side surface of the block and the second electrode formed on the upper surface thereof to provide a filter for passing a predetermined frequency band, second bore opening portions being arranged between the second electrode and the side surface of the block.