Waveguide port cavity dielectric filter

Abstract

The invention discloses a waveguide port cavity dielectric filter. An accommodating groove is formed in the upper surface of the cavity. The dielectric resonator is fixedly arranged at the bottom of the accommodating groove. The cover plate is fixedly arranged on the cavity. The lower end of the frequency tuning screw penetrates through the cover plate and extends into the accommodating groove. The frequency tuning screws are rotatably or slidably connected with the cover plate, one frequency tuning screw is arranged above each dielectric resonator, the coupling tuning screws transversely penetrate through the side wall of the cavity and extend into the accommodating groove, the coupling tuning screws are rotatably or slidably connected with the side wall of the cavity, and at least one coupling tuning screw is arranged between every two dielectric resonators. A signal input waveguide port is formed in the left end of the cavity bottom wall, a signal output waveguide port is formed inthe right end of the cavity bottom wall, and the signal input waveguide port and the signal output waveguide port communicate with the containing groove. The dielectric filter has the advantages of low insertion loss and wide waveguide working frequency range, and better electrical performance and smaller filter volume under the same frequency are obtained by replacing the cavity waveguide resonator with the dielectric resonator.

Description

technical field [0001] The invention relates to a waveguide cavity body dielectric filter, which belongs to the technical field of filters. Background technique [0002] In modern communication systems, microwave radio frequency devices are an important part. A filter is a basic radio frequency unit, and a series of indicators such as insertion loss, out-of-band rejection, power capacity, and volume have an important impact on the performance of the entire communication system. Due to its own loss, the traditional metal cavity filter cannot obtain a high quality factor when the cavity size is limited, resulting in certain restrictions on indicators such as out-of-band rejection and temperature drift. In traditional filter design, the coupling between two resonators is generally controlled by the distance between the resonators or the size of the coupling window between the two resonators. Coupling tuning screws are only used to fine-tune coupling to offset machining errors...

AI Technical Summary

Problems solved by technology

Due to its own loss, the traditional metal cavity filter cannot obtain a high quality factor when the cavity size is limited, resulting in certain restrictions on indicators such as out-of-band rejection and temperature drift.

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