Ceramic dielectric filled waveguide filter

Abstract

The invention relates to a ceramic dielectric filled waveguide filter. The ceramic dielectric filled waveguide filter adopts a staggered-resonant cavity topology structure. The filter includes a ceramic dielectric block, a resonant cavity group, grooves, an input port and an output port, wherein the ceramic dielectric block is provided with the resonant cavity group, the resonant cavity group includes multiple resonant cavities arranged in parallel in a staggered manner in two vertical layers, one individual resonant cavity of the upper layer is located on a central axis between two adjacent resonant cavities in the lower layer, a groove used for adjusting the coupling amount of the adjacent cavities is arranged between every two adjacent resonant cavities in the same layer, a groove usedfor adjusting the coupling amount of the adjacent cavities is arranged between two resonant cavities at the same side end portions of different layers, and the cross-coupling amount of two interlacedresonant cavities on the same diagonal lines of different layers is jointly adjusted through two interlaced grooves on another diagonal line. The filter is advantaged in that multiple cross-coupling structures are achieved through the staggered resonant cavities, a variety of cavity-to-cavity coupling effects are achieved through the grooves, and the filter with left and right transmission zero asymmetry is achieved.

Description

technical field [0001] The invention belongs to the technical field of filters, and relates to a dielectric-filled waveguide filter, in particular to a ceramic dielectric-filled waveguide filter. Background technique [0002] At present, in the 5G era, limited by the requirements of Massive MIMO (large-scale antenna technology) for large-scale antenna integration, the filter needs to be more miniaturized and integrated. In the case of limited cavity size, due to the loss of its own materials, Metal coaxial cavity filters and metal cavity dielectric filters cannot achieve a high Q value, resulting in restrictions on various performance indicators. [0003] In order to meet the miniaturization requirements of 5G base station filters, ceramic dielectric filters that are easier to miniaturize have become the mainstream solution. The electromagnetic wave resonance in the ceramic dielectric filter occurs inside the dielectric material. The traditional metal cavity is replaced by ...

AI Technical Summary

Problems solved by technology

[0012] Second, due to structural limitations, existing solutions cannot achieve cross-coupling between cross-resonator cavities, resulting in the inability to achieve transmission zeros with stronger coupling;

[0013] Third, for filter performance with high near-end suppression, more requirements for zero points, and asymmetrical left and right transmission zero points, such as the case where the zero point is high on the left and low on the right, and low on the left and high on the right, the existing structure cannot meet the requirements

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