Cavity filter capable of adjusting coupling intensity

Abstract

Disclosed is a cavity filter capable of adjusting coupling intensity. The cavity filter comprises a shell and a cover plate; a plurality of resonant cavities are formed in the shell in parallel at intervals; a resonant sheet is fixedly arranged on each resonant cavity; the resonant sheets are coupled and connected through different coupling sheets; semi-circular-arc surfaces are arranged on the two opposite side surfaces of each resonate cavity respectively; the semi-circular-arc surfaces of the two adjacent resonant cavities define a cylindrical adjustment cavity; an adjustor is arranged in the adjustment cavity movably up and down; and the adjustor passes through the cover plate, and by changing the extension depth of the adjustor to the adjustment cavity, the coupling strength between two adjacent resonant cavities can be changed. By virtue of the cavity filter capable of adjusting coupling intensity provided by the invention, the coupling strength between two adjacent resonant cavities can be adjusted flexibly, thereby satisfying the communication demand of different signals.

Description

technical field [0001] The invention relates to the field of cavity filters, in particular to a cavity filter capable of adjusting coupling strength. Background technique [0002] The filter is a typical frequency selection device, which can effectively suppress unwanted signals so that they cannot pass through the filter, and only useful signals pass through the filter smoothly. Therefore, the performance of the filter directly affects the quality of the entire communication system , is a crucial device in modern microwave and millimeter wave communication systems. [0003] Cavity filter is a very important filter. Compared with filters of other properties, it has firm structure, stable and reliable performance, small size, moderate Q value, far high-end parasitic passband and good heat dissipation performance. It can be used in larger power and frequency. [0004] There are mainly two types of coupling structures in existing cavity filters. [0005] The first such as F...

AI Technical Summary

Problems solved by technology

However, the head of the adjusting screw takes up a lot of space on the cover plate, and it is easy to occupy the placement of other parts, such as the installation of the lightning protection board, the control board placed on the tower, and the LNA board, which reduces the optional installation positions of other parts; the miniaturized cavity It is easy to interfere with other parts such as screw heads; the debugging depth is uncontrollable, and when debugging is too deep and the ribs of the cavity are too advanced, it may cause ignition when high-power signals pass through

Images