Novel dielectric filter coupling structure

Abstract

The invention discloses a novel dielectric filter coupling structure, which includes a dielectric filter body, a first blind hole, and a second blind hole. The first blind hole and the second blind hole are disposed on the same side of the dielectric filter body. The first and second blind holes and a dielectric on the dielectric filter body form two dielectric resonators. A negative coupling holeis arranged between the two dielectric resonators. The negative coupling hole and the openings of the first and second debugging holes are located on the same surface of the dielectric filter body. One end of the negative coupling hole penetrates through the dielectric filter body, and the other end of the negative coupling hole is a closed end. The negative coupling hole is provided therein witha boss. The boss and the dielectric filter body constitute an integrated structure. A continuous conductive layer is disposed on the inner wall of the negative coupling hole and the outer wall of theboss. The novel dielectric filter coupling structure controls the far-end parasitic pass-band frequency while realizing capacitive coupling.

Description

technical field [0001] The invention relates to a novel dielectric filter coupling structure, which belongs to the technical field of communication. Background technique [0002] With the development of wireless communication technology, the distribution of wireless communication base stations is becoming more and more dense, and the volume requirements of base stations are getting smaller and smaller. Among them, the RF front-end filter module accounts for a relatively large volume in the base station. Therefore, the size of the filter The volume requirement is also getting smaller and smaller. However, when reducing the volume of the metal coaxial cavity filter, it is found that the smaller the volume of the filter, the greater the surface current, the greater the loss, and the lower the power bearing capacity, that is, the smaller the power capacity. That is to say, as the volume of the metal coaxial cavity filter decreases, its performance index becomes worse. At prese...

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Problems solved by technology

At present, there is a miniaturized filter, that is, a solid dielectric filter, which is widely used, but the structure of realizing capacitive coupling (or negative coupling) in a solid dielectric filter is relatively complicated, the process is difficult to realize, and it is easy to cause the passband Nearer frequencies produce spurious passbands. Therefore, how to provide a dielectric filter with a simple structure and low process difficulty has become a research direction for those skilled in the art.

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