Patent ID: 8970326
Filing Date: 2015-03-03
Classification: H01P

Abstract:
1. A coaxial resonator, comprising: a dielectric block; a first inner conductor disposed in an inner surface of a first through hole that extends from a first main surface of the dielectric block to an opposite second main surface thereof, the first inner conductor being connected to a reference potential at a side thereof toward the first main surface; and an outer conductor disposed over side surfaces of the dielectric block, the outer conductor surrounding the first inner conductor, the outer conductor being connected to the reference potential, wherein there is a low-dielectric-constant portion in a location between the first inner conductor and the outer conductor, the low-dielectric-constant portion surrounds a periphery of the first inner conductor, the low-dielectric-constant portion is lower in dielectric constant than the dielectric block, the low-dielectric-constant portion is a recess that is disposed in the first main surface of the dielectric block, the recess continuously surrounds the periphery of the first inner conductor, and an inner surface of the recess is a conductor-free region.