| 摘要 |
The invention relates to an adjustable resonator filter (100), which has a casing made up of a bottom (113), walls (112) and a lid, which casing functions as a ground for a transmission path, which is divided with conductive partitions into resonator cavities (101, 105), and on the transmission path of the resonator filter there is a coupling opening (104) in the partitions (103) separating subsequent cavities. In the casing there is by at least one partition a coupling space (108), which is open into both resonator cavities separated by the partition, which resonator filter has an inductive coupling member (110). This is arranged to extend through said coupling space into both resonator cavities. Said inductive coupling member is in electric contact with the casing at least in one of the resonator cavities. In the coupling space there is a moveable conductive adjustment piece (107), which has a minimum position for the coupling and a maximum position for the coupling. In the maximum position for the coupling the adjustment piece is in the immediate vicinity of the inductive coupling member, loading the inductive coupling member via the capacitive coupling. In the minimum position for the coupling the adjustment piece is apart from the inductive coupling member. The adjustment piece is in said positions and in its path outside them at least partly outside the resonator cavities or in the area of the resonator cavities, where the electric and magnetic field are essentially at their minimum. |
