A Cross-Coupled Dielectric Waveguide Filter

Abstract

The invention relates to a cross-coupled dielectric waveguide filter, which comprises a ceramic dielectric body, and a metal shielding layer is formed on the outer side of the ceramic dielectric body through metallization; multiple groups of resonant holes are arranged on one side of the ceramic dielectric body, and each group of resonant holes includes Two symmetrically arranged resonant blind holes; a through groove through the ceramic dielectric body is arranged between each group of resonant holes, and several resonant cavities are separated by the through groove; multiple couplings with adjustable sizes are also arranged on the dielectric body Blind holes form a coupling window between every two groups of resonant holes; at least one of the through slots is an arc-shaped through slot, and cooperates with a coupling blind hole to form a cross-coupling zero point; the invention solves the problem of high rectangularity of the filter ; The integrated molding structure of the ceramic dielectric body is conducive to miniaturization and consistency; an arc-shaped slot is set in the resonant cavity on the dielectric body, and the position of the cross-coupling zero point can be changed by adjusting the radian and arc length of the arc-shaped slot to improve Out-of-band suppression, thereby reducing the impact on other communication frequency bands.

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] Filters are indispensable electronic components in microwave communication systems, and their performance determines the quality of communication systems. 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 has greatly increased the demand for filters. Therefore, small size, light weight, high performance filters emerge as the times require and are imperative. The dielectric waveguide filter combines the excellent performance of the cavity filter and the traditional dielectric filter, so it becomes the best choice for 5G communication equipment. [0003] The traditional waveguide filter is an air-filled metal cavity structure, and the edge of the me...

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Problems solved by technology

[0004] However, due to the influence 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 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 from the drawings of the patent that the The squareness of the 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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