Three-stage filter

Abstract

A three-stage filter includes a cavity, wherein the interior of the cavity is divided into a plurality of resonant cavities by separating plates; each resonant cavity is provided therein with a resonant plate; the resonant plates in every two adjacent resonant cavities are connected to each other; flying rod seats are mounted on two separating plates; flying rod pieces are mounted on the flying rod seats; two flying rod wires are mounted on two resonant plates; the cavity is a structural member with an open upper end and an open lower end; the separating plates and the resonance plates are all implanted into the sidewall of the cavity; the separating plates, the resonator plates and the cavity are integrally formed; the upper end cover of the cavity is provided with an upper cover plate; the lower end cover of the cavity is provided with a lower cover plate; and the upper cover plate and the lower cover plate cooperate to seal the openings of the cavity. The three-stage filter uses a three-stage structure, the resonance plates and the cavity form an integrated structure, the lower cover plate is provided, the number of internal parts is reduced, an assembly mode is optimized, the resonance plates are prevented from being separately mounted and welded, and the resonance plates and the cavity are integrally designed to solve the welding difficulties in the production process.

Description

technical field [0001] The invention relates to the field of modern communication, in particular to a three-section filter. 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] The first solution - cavity filter, the coupling structure generally adopts a rod-shaped resonant rod, and the corresponding coupling ...

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a three-stage filter to solve the problem of high processing and assembly cost of the existing filter and inconvenient replacement

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