Dielectric waveguide filter

Abstract

The embodiment of the invention provides a dielectric waveguide filter, and the filter at least comprises a first resonator which is provided with a dielectric block, wherein the surface of the dielectric block is covered with a conductive layer; and a second resonator which is provided with a dielectric block, wherein the surface of the dielectric block is covered with a conductive layer. The contact surfaces of the first and second resonators are provided with coupling windows, thereby exposing the mediums of the first and second resonators. The mediums are used for the coupling between the first and second resonators. The sizes of the length of the coupling windows are set to be greater than the half-wavelength of the working frequency of the filter, so as to enable the coupling polarities between the first and second resonators to be opposite. According to the embodiment of the invention, the filter can enable the coupling polarities between the first and second resonators to be opposite, and generates negative coupling. The filter is flexible in topological structure, is simple in structure, and is easy to assemble.

Description

technical field [0001] The invention relates to a radio frequency filter, in particular to a dielectric waveguide filter. Background technique [0002] With the development of the filter industry, miniaturization and light weight have gradually become a trend. The dielectric waveguide can greatly reduce the size of the product, and has the advantages of high Q value and small temperature drift. It is a good miniaturization solution. [0003] The current dielectric waveguide filter and cavity filter still have the technical problems of complex cross-coupling (negative coupling) structure, inflexibility, and difficult implementation. For example: the existing dielectric waveguide filters that generate cross-coupling mainly have the following three forms: [0004] The first is the solution of the metal probe structure, which can generate negative cross-coupling. During implementation, the medium needs to be punched, and then the metal probe is inserted into the medium. Alth...

AI Technical Summary

Problems solved by technology

The existing technical problems are: on the one hand, the parts of the product are increased, which is cumbersome in assembly and fixing, and the efficiency is low

On the other hand, the cross-coupling provided by this structure is weak and difficult to strengthen, which further increases the difficulty of design

[0006] The third solution is the metal probe structure applied to the coaxial cavity filter to generate negative cross-coupling. The main disadvantage of this solution is that the metal probe needs to be supported by a medium, and the assembly is more complicated.

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