Patent ID: 6844796

Claim:
A dielectric filter comprising: a dielectric block including side and end surfaces; a plurality of resonators provided in the dielectric block in parallel with each other, each of said resonators comprising an inner conductor on a wall surface of a through-hole extending from a first end surface of the dielectric block to a second end surface of the dielectric block opposite the first end surface; and an outer conductor on the side and end surfaces of the dielectric block except for the first end surface, the inner conductor on the wall surface of each through-hole and the outer conductor on the circumferential surface of the dielectric block being connected together so that the second end surface serves as a short circuit end surface, and the first end surface serves as an open end surface; and the dielectric filter further comprising: a pair of input-output terminals disposed on one side surface of the dielectric block such that the input-output terminals are located adjacent to the open end surface at respective positions corresponding to open ends of two of said resonators; insulating sections on said one side surface, each of said insulating sections isolating a corresponding one of the input-output terminals from the outer conductor on said one side surface of the dielectric block; and a further section without a conductor thereon for controlling filter characteristics of said dielectric filter, said further section being located on said one side surface so as to be disposed between the input-output terminals, and extending over a predetermined distance along the insulating sections from an edge between said one side surface and the open end surface.