Cavity filter

Abstract

The invention discloses a cavity filter, which comprises a cavity, a cover board and a tuning self-locking bolt, wherein the cover board is used for closing the cavity of the cavity filter; the cover board comprises a cover board body; the cover board body is made of an aluminum product; a tuning threaded hole is formed in the cover board body and specifically is a lug boss which extends towards the direction of the cavity and is molded integrally with the cover board body; the tuning self-locking bolt is divided into a head part and a rod part and is fabricated by copper; the head part is arranged at one end of the bolt; the rod part is arranged at the other end of the bolt; two sets of threads are arranged on the head part of the bolt to form screws; the upper and lower two sets of threads are the same in diameter L and screw pitch P; and the diameter of the part between the two threads is 40%-70% that of the rod part. The cavity filter disclosed by the invention has the advantages of low cost and tuning performance.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a cavity filter. Background technique [0002] At present, the signal processing of the cavity filter is usually completed by the tuning self-locking screw on the filter cover. Generally speaking, the problem dealt with by the tuning screw is the problem of signal intermodulation. Specifically, it refers to two different frequency signals. A signal of a new frequency generated by superposition within a system. [0003] The current common filters include cavity, cover plate and tuning self-locking screws and other components. Most of the filter cover plates are now processed by stamping holes on the plate to process the tuning holes. On the one hand, the threaded holes are processed by stamping. The defective rate is high and the manufacturing cost is too high. On the other hand, the punched tuning hole needs to be additionally installed with a tuning screw sleeve. The tuning scr...

AI Technical Summary

Problems solved by technology

[0003] The current common filters include cavity, cover plate and tuning self-locking screws and other components. Most of the filter cover plates are now processed by stamping holes on the plate to process the tuning holes. On the one hand, the threaded holes are processed by stamping. The defective rate is high and the manufacturing cost is too high. On the other hand, the punched tuning hole needs to be additionally installed with a tuning screw sleeve. The tuning screw sleeve is fixed on the tuning hole by welding, riveting, gluing, etc. The tuning screw sleeve The installation not only requires labor costs and processing costs, but at the same time, the additional tuning screw sleeve installed on the tuning hole is not stable, and it is easy to loosen after a period of time, and the interface between the tuning hole and the tuning screw sleeve is not stable. Flat, which ultimately affects the actual tuning effect

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