DIELECTRIC FILTER, DIELECTRIC DUPLEXER AND COMMUNICATION EQUIPMENT

摘要

PURPOSE: A dielectric filter, dielectric duplexer and communication equipment is to prevent Q0 of a resonator from being deteriorated and a facing area of input/output electrodes and an inner conductor from being decreased. CONSTITUTION: A dielectric filter comprises: a through hole(2a,2b) formed between a facing pair of sectional faces of a dielectric block(1); an inner conductor(3a,3b) formed at the inner circumferential surface of the through hole; a ground conductor(5) formed at the outer surface of the dielectric block; and an inner conductor non-forming portion where the inner conductor is not formed around one section regarded as a section of an opening side. One surface of the dielectric block is regarded as a mounting face and at least a part of a ledge line between the section of the opening side and the mounting face is removed. At least one input/output electrode is capacitance-coupled with the inner conductor from the removed place of the ledge line to the mounting face.