Dielectric waveguide filter

Abstract

The invention relates to the technical field of filters, and provides a dielectric waveguide filter. The filter comprises a dielectric body, the dielectric body comprises a first surface and a secondsurface, the first surface is provided with a plurality of groups of resonance parts, each group of resonance parts comprises two resonance blind holes which are symmetrically arranged, and a first coupling blind hole is arranged between the two resonance blind holes of one group of resonance parts; the second surface is provided with a second coupling blind hole, the central axis of the first coupling blind hole coincides with the central axis of the second coupling blind hole, and the first coupling blind hole and the second coupling blind hole form a capacitive coupling structure. By applying the technical scheme, the first coupling blind hole and the second coupling blind hole which are symmetrical up and down generate a pair of zero points, so that the out-of-band rejection performance can be improved; and meanwhile, the depth of the first coupling blind hole is reduced and is basically consistent with the hole depth of the resonance blind hole, so that the number of pressing punches can be reduced, and the complexity of a filter mold is reduced.

Description

【Technical field】 [0001] The invention relates to the technical field of filters, in particular to a dielectric waveguide filter. 【Background technique】 [0002] In the 5G era, limited by the requirements of Massive MIMO (large-scale antenna technology) for large-scale antenna integration, filters need to be more miniaturized, integrated, and lightweight. In the case of limited size, due to their own material loss, traditional metal cavity filters and dielectric resonant cavity filters cannot achieve high Q values ​​(Q values ​​represent loss / input power), resulting in various Performance metrics are limited. The ceramic dielectric waveguide filter has no metal cavity because the electromagnetic wave resonance occurs inside the dielectric material, and the dielectric constant of its own material is generally 20-50, so the volume will be smaller. At the same time, the ceramic dielectric waveguide filter has the advantages of high Q value, good frequency selection characteri...

AI Technical Summary

Problems solved by technology

[0003] Although the dielectric waveguide filter has the above advantages, most of the current dielectric waveguide filters are integrally dry-pressed. Therefore, the actual structure of the dielectric waveguide filter is relatively high. Some structures that can be easily realized in a metal cavity, Difficult to realize in dielectric waveguide filter

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