Tuning self-locking bolt

Abstract

The invention discloses a tuning self-locking bolt, which is applied to a cavity filter. 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; the rod part extends into the cavity of the filter to tune radio frequency parameters; the head part fixes the self-locking bolt on a cover board of the filter; the top end of the head part is provided with a receiving groove which is used for receiving a screw driver and screwing the tuning bolt into the cavity filter according to the drive of the screw driver; two sets of threads are formed in the head part of the bolt to form screws; the diameters of the screws formed by the threads are greater than or equal to M4; the two sets of threads are not connected with each other; the upper and lower sets of threads are the same in screw pitch P; the diameter of the upper thread is greater than that of the lower thread; the diameter ratio of the upper thread to the lower thread is (1.01 to 1) to (1.1 to 1); and the diameter of the part between the two threads is 40%-70% that of the rod part. The bolt disclosed by the invention has a relatively good self-locking effect.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a tuning self-locking screw. Background technique [0002] As a frequency selection device, the filter is widely used in the field of communication, especially in the field of radio frequency communication. In the base station where the communication system completes signal transmission and reception, the filter is used to select the communication signal and filter out the noise outside the frequency of the communication signal. waves or interfering signals. [0003] At present, the signal processing of the cavity filter is usually completed by the tuning 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. After adjusting the resonant frequency, in order to prevent the above tuning screw from loosening, it is usually necessary to add a fixin...

AI Technical Summary

Problems solved by technology

[0003] At present, the signal processing of the cavity filter is usually completed by the tuning 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. After adjusting the resonant frequency, in order to prevent the above tuning screw from loosening, it is usually necessary to add a fixing nut to the part of the tuning screw outside the cavity, and installing another fixing nut will not only It consumes more material costs and additional labor costs, and the effect of additional reinforcement with fixing nuts is often unsatisfactory

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