Dielectric filter
A dielectric filter includes a housing, a dielectric resonator, a cover plate, and a tuning structure. A resonant slot is disposed on the housing, a support portion is disposed in the resonant slot, and the support portion encloses to form an intermodulation groove at a slot bottom of the resonant slot. The dielectric resonator is mounted on the support portion and covers a groove opening of the intermodulation groove, multiple adjustment holes are disposed on the dielectric resonator, and the multiple adjustment holes communicate with the intermodulation groove. The cover plate is connected to the housing, covers an opening of the resonant slot, and is spaced apart from the dielectric resonator. The tuning structure is connected to the cover plate, where each of the multiple adjustment holes is configured with one tuning structure.
1 . A dielectric filter, comprising:
a housing, wherein a resonant slot is disposed on the housing, a support portion is disposed in the resonant slot, and the support portion encloses to form an intermodulation groove at a slot bottom of the resonant slot;
a dielectric resonator, wherein the dielectric resonator is mounted on the support portion and covers a groove opening of the intermodulation groove, a plurality of adjustment holes are disposed on the dielectric resonator, and the plurality of adjustment holes communicate with the intermodulation groove;
a cover plate, wherein the cover plate is connected to the housing, covers an opening of the resonant slot, and is spaced apart from the dielectric resonator; and
a tuning structure, wherein the tuning structure is connected to the cover plate, and each of the plurality of adjustment holes is configured with one tuning structure;
wherein the support portion comprises an annular boss and an annular bushing, the annular boss is integrally formed with and connected to the slot bottom and/or a slot wall of the resonant slot, the annular bushing is mounted in the annular boss, and the dielectric resonator is mounted on the annular bushing.
2 . The dielectric filter of claim 1 , wherein the annular bushing is press-riveted or screwed into the annular boss.
3 . The dielectric filter of claim 2 , wherein one end of the dielectric resonator towards the support portion is provided with a silver plating layer, and the dielectric resonator is welded to the support portion through the silver plating layer.
4 . The dielectric filter of claim 1 , wherein one end of the dielectric resonator towards the support portion is provided with a silver plating layer, and the dielectric resonator is welded to the support portion through the silver plating layer.