Cover board of cavity filter

Abstract

The invention discloses a cover board of a cavity filter. The cover board is used for closing a cavity of the cavity filter and comprises a cover board body and a tuning thread sleeve, wherein the cover board is characterized in that the cover board body is made of copper aluminum alloy; the alloy is copper-aluminum composite integrated alloy, namely one surface is made of copper and the other surface is made of aluminum; the aluminum surface is aligned at the cavity when the cover board is used; a mounting hole is formed in the cover board body; the tuning thread sleeve is matched with a tuning self-locking bolt of the filter; the thread sleeve passes through the mounting hole towards the direction of the cavity and is fixed on the mounting hole; a threaded hole is formed in the tuning thread sleeve along the axis direction; a tuning hole which is connected with the threaded hole is also formed in the tuning thread sleeve along the axis direction; the tuning hole is closer to the cavity of the filter than the threaded hole; and the diameter of the tuning hole is smaller than that of the tuning self-locking bolt of the filter. According to the cover board of the cavity filter, the cost and the tuning performance are considered; and resources are saved.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a cavity filter cover plate. 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 made of pure copper material or metal material with copper plating on the surface, which is too expensive. In addition, in the existing design When the cover plate and the tuning screw are effectively combined through the threads in the tuning screw hole on the cover plate, the thickness of the thread section i...

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 made of pure copper material or metal material with copper plating on the surface, which is too expensive. In addition, in the existing design When the cover plate and the tuning screw are effectively combined through the threads in the tuning screw hole on the cover plate, the thickness of the thread section in the tuning screw hole is almost equal to the total thickness of the tuning screw hole, and the current density at the joint between the tuning screw and the cover plate is very large, and Because the thread is always helical, the last half circle of thread on the cover plate always has an end, and the last half circle of thread cannot be tightly combined with the cover plate, resulting in the joint between the tuning screw and the cover plate having a great influence on the intermodulation , making the intermodulation pass-through rate of the cavity filter very poor

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