Asymmetric regular mode-mixing filter

Abstract

The invention relates to an asymmetric regular mode-mixing filter, comprising a main body and a cover plate, wherein first to fifth circular cavities are arranged on one surface of the main body and are internally and uniformly provided with harmonic oscillators; an input end and an output end are arranged on the wall of the main body and are respectively connected with the harmonic oscillators in the first circular cavity and the fifth circular cavity; the first circular cavity, the second circular cavity and the third circular cavity are arranged at a first straight line, the fifth circular cavity and the fourth circular cavity are arranged at a second straight line, the first straight line is parallel to the second straight line, the fourth circular cavity, the third circular cavity and the second circular cavity are arranged in shape of triangle, and the fifth circular cavity, the second circular cavity and the first circular cavity are arranged in shape of the triangle; and radial connection lines among the first to fifth circular cavities are provided with coupling windows. The asymmetric regular mode-mixing filter disclosed by the invention has the characteristics that the harmonic oscillators in the first, second, fourth and fifth circular cavities are metal coaxial harmonic oscillators, and the harmonic oscillator in the third circular cavity is a medium loading harmonic oscillator. The asymmetric regular mode-mixing filter disclosed by the invention has the advantages of wide use range and low manufacturing cost, and is suitable for wireless communication base station.

Description

technical field [0001] The invention relates to a filter. Specifically, it is a mixed-mode circular cavity filter with multiple asymmetric zero points, especially suitable for wireless communication base stations. Background technique [0002] In recent years, microwave filters with asymmetric functions have been widely used in wireless communication base stations. The resonators used in this asymmetric function microwave filter are either all metal coaxial resonators, or all dielectric-loaded resonators. All metal coaxial resonators are used, which are easy to manufacture and cheap, but the insertion loss is large and the Q value is not high. Therefore, the asymmetric function filter using the metal coaxial resonator can only be used in systems with low Q value requirements, and cannot be used in systems with high Q value requirements, and the scope of application is limited. The Q value of the medium-loaded resonator is two to three times that of the metal coaxial reson...

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Problems solved by technology

All metal coaxial resonators are used, which are easy to manufacture and cheap, but the insertion loss is large and the Q value is not high

Therefore, the asymmetric function filter using metal coaxial resonators can only be used in systems that do not require high Q values, and cannot be used in systems that require high Q values, and the scope of use is limited.

The Q value of the medium-loaded resonator is two to three times that of the metal coaxial resonator. It can be applied to systems that require a high Q value, but the high-order harmonic characteristics are poor and the price is relatively expensive. If all medium-loaded resonators are used Sub, will increase the manufacturing cost of the asymmetric function filter

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