1 results about "Null point" patented technology

This application relates to the field of filtering device technology, and provides a filter comprising three resonant cavities, three resonators, and a coupling plate arranged side-by-side. The three resonant cavities are, in sequence, a first resonant cavity, a second resonant cavity, and a third resonant cavity. The three resonators are correspondingly disposed within the three resonant cavities. The coupling plate includes a first piece spanning the three resonant cavities and located on one side of each resonator. A second piece and a third piece, bent and grounded, are respectively provided at both ends of the first piece. The first piece also has a clearance section, which is further away from the resonators than the first piece and is arranged parallel to the inner wall of the filter. This filter avoids the resonant frequency of the coupling plate itself affecting the passband of the filter by cross-coupling the first piece with the second and third pieces, enabling the three resonant cavities arranged side-by-side to achieve the beneficial effect of a single zero point.