A kind of siw double-layer cavity filter

Abstract

The invention belongs to the field of microwave passive devices, and provides a SIW double-layer cavity filter, which is used to overcome the shortcomings of the traditional rectangular waveguide filter that is too large and difficult to integrate with active circuits. The SIW double-layer cavity The filter includes a dielectric substrate, an input microstrip line, the first, second, third, and fourth resonant cavities, and an output microstrip line. The first and fourth resonant cavities are arranged side by side to form an upper resonant cavity. The second and third resonant cavities The resonant cavities are arranged side by side to form the lower resonant cavities, each resonant cavity center is provided with an inductance adapter; the input microstrip line is connected to the first resonant cavity through a magnetic coupling structure, and the output microstrip line is connected to the first resonant cavity through a magnetic coupling structure. The four resonant cavities are connected; coupling windows are provided between the first and second resonant cavities, between the fourth and third resonant cavities, and between the second and third resonant cavities. The invention significantly improves the Q value of the cavity filter, has small volume, is easy to realize connection with active circuits, and has high reliability.

Description

technical field [0001] The invention belongs to the field of microwave passive devices, and in particular relates to an SIW double-layer cavity filter. Background technique [0002] SIW (Substrate Integrated Waveguide.SIW) is a new type of transmission line structure that can be integrated into a dielectric substrate. The basic structure of SIW is realized by setting metallized through holes or metal columns on a double-sided copper-clad dielectric substrate. The SIW structure has the advantages of traditional waveguides and microstrip lines, that is, it has the advantages of low radiation, low insertion loss, high Q value, high power capacity, miniaturization, and easy connection. [0003] At present, common cavity filters are mainly based on traditional waveguides (such as rectangular waveguides). Although traditional waveguide filters have the characteristics of high Q value, high power, and low loss; , resulting in a larger size of the filter, and it is not easy to conn...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a SIW double-layer cavity filter for the defects of the above-mentioned background technology. The shortcomings of the filter are beneficial to the miniaturization of the filter and the integration with the active circuit, and it also has the advantage of high reliability of the integrated production

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