Dielectric filter and dielectric duplexer

摘要

The invention provides a dielectric filter, comprising: a dielectric block having substantially rectangular shape, said dielectric block including a first and a second opposed to each other and a third and a fourth opposed to each other and extending between said first and second surfaces; a plurality of through holes extending between said first and second surfaces; an inner conductor provided on an inner surface of said through holes except for a non-conductive portion, said non-conductive portion being disposed on said inner surface of said through holes in the vicinity of said first surface of said dielectric block; an outer conductor provided on said third and fourth surfaces of said dielectric block; and a line conductor provided on said first surface of said dielectric block, a part of said outer conductor provided on said third surface of said dielectric block and a part of said outer conductor provided on said fourth surface of said dielectric block being connected to each other via said line conductor; thereby a plurality of resonators comprising a combination of a TEM mode resonator and a TE mode resonator, and a combination of a TEM mode resonator or a TM mode resonator being provided.