Filter and communication equipment

Abstract

The invention discloses a filter and a communication device. The filter comprises a filter cavity, a cover plate, a tuning screw, a resonator and a dielectric disk. The cover plate is covered on the filter cavity to form a resonant cavity , The resonator and the dielectric plate are disposed in the resonant cavity, and the resonator is relatively fixed with the filter cavity, the tuning screw penetrates the cover plate, the dielectric plate is fixed on one of the tuning screw and the resonator, and the other one of the resonators is spaced apart and the spacing distance between the media diskand the other of the tuning screw and the resonator is adjusted by the tuning screw. In the above way, the present invention provides a filter and communication device capable of changing capacitancein a wide range in order to achieve the purpose of adjusting the filter parameters, thereby reducing the manufacturing and assembly precision of components and improving the yield of the filter products, increasing the possibility of more powerful filters, as well as achieving the purpose of filter miniaturization design.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a filter and communication equipment. Background technique [0002] As a frequency selection device, mobile filters are widely used in the field of communication, especially in the field of radio frequency communication. In the base station, the filter is used to select the communication signal and filter out the clutter or interference signal outside the frequency of the communication signal. [0003] Taking a cavity filter as an example, a cavity filter usually includes a filter cavity, a cover plate, a tuning screw, a resonator, and a dielectric disk. Wherein, in the prior art, the dielectric disc is located between the cover plate and the resonator, and they are closely matched. Due to the limitation of the assembly method, there will be at least one movable connection between the dielectric plate and the resonator or the cover plate, and this movable connection must ...

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Problems solved by technology

[0004] It can be seen that the structure of the cavity filter in the prior art is complex, the parts require high manufacturing precision, and the adjustable range of the screw is small, and the tuning is only done by extending the screw into the resonator

And because the contact surfaces are all flat, under the action of elastic pressure and production tolerance, it will inevitably cause the contact surface to be uneven and form partial contact, resulting in poor contact, which greatly affects the realization of radio frequency indicators or is uncontrollable

In addition, the dielectric disk is easily broken under the action of pressure, and it is difficult to find the failure of the filter function in actual work, which is difficult to rework and has a high defect rate

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