Patent ID: 6734765
Filing Date: 2004-05-11
Classification: H01P

Abstract:
A dielectric filter comprising:a dielectric block having opposing open and closed end faces extending between opposing top and mounting surfaces thereof; an outer conductor formed on an outer surface of the dielectric block including the top and mounting surfaces and the closed end face thereof and a part of the open end face; a plurality of plated through holes extending from the open end face to the closed end face of the dielectric block, the plated through holes having respective internal conductors formed thereon, the internal conductors being conductively coupled to the outer conductor at the closed end face of the dielectric block; an excitation hole extending from the open end face to the closed end face of the dielectric block and having an inside electrode formed thereon, the inside electrode being conductively coupled to the outer conductor at the open end face thereof; an input-output electrode extending over the closed end face of the dielectric block and the mounting surface of the dielectric block, the input-output electrode being conductively coupled to the inside electrode of the excitation hole; and ground current setting means for controlling the ground current flowing through the outer conductor located on the open end surface of the dielectric block from the inside electrode of the excitation hole to the top and mounting surfaces of the dielectric block, the ground current setting means being an electrode-free portion provided on the open end face at a location between one end of the excitation hole and the top and/or mounting surfaces.