Patent ID: 6566986
Filing Date: 2003-05-20
Classification: H01P

Abstract:
A dielectric filter in which three or more resonators are integrally formed in a rectangular parallelepiped dielectric block, said dielectric filter characterized in that:in each of the dielectric resonators respectively located on each end portion of said dielectric block with respect a longitudinal direction thereof, and input/output electrode made up of island type of conductive film is formed respectively on the same surface of said dielectric block, and an earth electrode is formed on almost of all remaining area of said same surface so as to be isolated from said input/output electrode and is also formed on all of the other surfaces; in each of the other dielectric resonators, an earth electrode made up of conductive film is formed on all surfaces thereof; and between the dielectric resonators, a through hole extending from the surface on which the input/output electrode is formed to the surface opposite thereto is formed, wherein a longitudinal length of the dielectric resonators respectively located on each end portion of said dielectric block is greater than that of the other resonators.