Patent ID: 7825752

Claim:
A dielectric filter comprising: a dielectric block disposed on a mount board, an undersurface of the dielectric block being a mounting surface; an outer conductor on an outer surface of the dielectric block and connected to a ground on the mounting surface; an inner conductor on an inner surface of an inner conductor formation hole that passes through the dielectric block, the inner conductor having an open end on a front surface of the dielectric block; and an input/output electrode separated from the outer conductor and coupled to the inner conductor, wherein the input/output electrode includes, on the undersurface of the dielectric block, undersurface input/output electrode portions, a first of the undersurface input/output electrode portions extending from a boundary between a first side surface and the undersurface of the dielectric block to a boundary between the front surface and the undersurface of the dielectric block, and a second of the undersurface input/output electrode portions extending from a boundary between a second side surface and the undersurface of the dielectric block to the boundary between the front surface and the undersurface of the dielectric block, and wherein the outer conductor includes, on the undersurface of the dielectric block, undersurface electrode corner portions, a first undersurface electrode corner portion disposed at a first corner formed by the front surface and the first side surface of the dielectric block and a second undersurface electrode corner portion disposed at a second corner formed by the front surface and the second side surface of the dielectric block, and an undersurface electrode main portion disposed between the undersurface electrode corner portions and is separated from the undersurface input/output electrode portions.