Dielelectric filter, dielelectric duplexer, and communication apparatus

摘要

The invention provides a dielectric filter, comprising: a dielectric block (1) having a first end face and a second end face and side faces extending therebetween; a plurality of resonator holes (2a; 2b) and at least one external coupling hole (3a; 3b) respectively passing through both end faces; inner conductors (5) provided on inner faces of the resonator holes and the external coupling holes; an external conductor (6) provided on the outer faces of the dielectric block; concavities (8) provided in formation regions of the external coupling holes on the first and the second end face and in the short-circuiting regions of the resonator holes; and the external conductor (6) being removed except from the portions of the concavities in the first end face and the second end face, thereby forming open faces of the resonator holes on the first end face and the second end face. <IMAGE>