Cross-coupling dielectric waveguide filter

Abstract

The invention relates to a cross-coupling dielectric waveguide filter, which comprises a ceramic dielectric body. A metal shielding layer is formed on the outer side of the ceramic dielectric body through metallization; a plurality of groups of resonance holes are formed in the surface of one side of the ceramic dielectric body; and each group of resonance holes comprises two resonance blind holeswhich are symmetrically formed. A through groove running through the ceramic dielectric body is formed between every two groups of resonant holes, and a plurality of resonant cavities are separated by the through grooves; the dielectric body is also provided with a plurality of coupling blind holes with adjustable sizes; a coupling window is formed between every two groups of resonance holes; andat least one through groove is an arc-shaped through groove and is matched with one coupling blind hole to form a cross coupling zero point. According to the invention, the problem of high rectangularity of the filter is solved; the integrated structure of the ceramic dielectric body is beneficial to miniaturization and consistency; and the arc-shaped through groove is formed in the resonant cavity in the dielectric body, and the position of the cross coupling zero point can be changed by adjusting the radian and the arc length of the arc-shaped through groove, so that out-of-band rejection is improved, and the influence on other communication frequency bands is reduced.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a dielectric filter, in particular to a cross-coupling dielectric waveguide filter. Background technique [0002] The filter is an indispensable electronic component in the microwave communication system, and its performance determines the quality of the communication system. With the advent of 5G communication technology, the number of 5G base station antenna ports has increased from the traditional 8 ports to 64 ports and 128 ports, which greatly increases the demand for filters. Therefore, small-volume, lightweight, high-performance filters emerge as the times require and are imperative. The dielectric waveguide filter combines the excellent performance of cavity filters and traditional dielectric filters, so it has become the best choice for 5G communication equipment. [0003] The traditional waveguide filter is an air-filled metal cavity structure, and the edge of the...

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Problems solved by technology

[0004] However, due to the impact of its structure, the dielectric waveguide cannot flexibly change the cross-zero structure like the traditional metal cavity; Chinese patent CN110277612A proposes a dielectric waveguide filter with symmetrical cross-coupling zeros; The first blind hole and the second blind hole that are symmetrical to the dielectric resonance center can realize cross-coupling zero point and improve out-of-band suppression, thereby reducing the impact on other communication frequency bands. However, it can be seen in Figure 9 of the patent that, The squareness of this scheme is not high, and other effects need to be further improved; therefore, in order to improve the frequency selection filtering performance of the base station, it is an urgent problem to be solved to achieve low loss, high squareness of the filter and improve the out-of-band rejection of the filter

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