cavity filter

Abstract

The invention provides a cavity filter. The cavity filter comprises a cavity body, an anti-thunder structure and a conductive connecting piece. A plurality of resonant cavities and a common cavity areformed in the cavity body; the resonant cavities are formed around the common cavity, and the resonant cavities are separately connected with the common cavity through corresponding coupling windowsin a coupling mode; a transmission port is formed in the cavity body, and the transmission port corresponds to the common cavity; the anti-thunder structure is arranged corresponding to the transmission port and is connected with the transmission port; the anti-thunder structure comprises anti-thunder inductance, an anti-thunder plate and an anti-thunder main rod, wherein the anti-thunder plate and the anti-thunder main rod are separately and electrically connected to the two ends of the anti-thunder inductance; one end of the conductive connecting piece is electrically connected with the common cavity, and the other end of the conductive connecting piece is electrically connected with the anti-thunder main rod of the anti-thunder structure; and the conductive connecting piece is of a flake shape and matched with the transmission port. The conductive connecting piece adopts a flake-shaped structure, not only the rigidity of the conductive connecting piece can be guaranteed to prevent the conductive connecting piece from being deformed, but also the conductive connecting piece is matched with the transmission port, so that a time delay value of the port of the filter is stable.

Description

technical field [0001] The invention relates to the communication field, in particular to a cavity filter. Background technique [0002] As a frequency selection device, the cavity filter is widely used in the communication field. In the communication base station system, it is mainly used to select communication signals and filter out clutter or interference signals outside the communication signal frequency. With the development of modern communication technology, people put forward more and more strict requirements on the performance, volume and weight of communication equipment, which leads to the inevitable trend of miniaturization of cavity filters. [0003] Lightning is a common natural disaster that often damages electrical equipment connected to communication lines, and cavity filters are used as key equipment for sending and receiving signals. When in use, the lightning protection design must be considered. The existing cavity filter lightning protection design ge...

AI Technical Summary

Problems solved by technology

The grounding of the cavity filter port not only makes the residual voltage index performance of the lightning protection channel poor, but also the space of the cavity filter is limited so that the diameter of the silver-plated wire is between 1.5mm-3mm, so the silver-plated wire is easily deformed, and the silver-plated wire is deformed Afterwards, its impedance cannot reach the required value, which will cause a mismatch between the cavity and the silver-plated wire, making the delay data of the port unstable, and finally making it difficult for the cavity filter to achieve the ideal port delay strength

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