Multimode mixed cavity structure used in filter

Abstract

The invention discloses a multimode mixed cavity structure used in a filter. The structure comprises a resonance rod, medium gaskets, a cavity body and a cover plate, wherein the cover plate is arranged on the cavity body, the cavity body is provided with a resonance cavity with hollow inner portion, and the resonance rod is arranged in the resonance cavity. The structure is characterized in thatthe resonance rod is composed of a plurality of rods which are perpendicular to one another, the resonance rod is made from metal or metal alley or nonmetal materials with metallized surfaces, one medium gasket is arranged between at least one end portion of the resonance rod and the inner wall of the cavity body, one end of each gasket is connected to the end portion of the resonance rod, and theother end of the corresponding gasket is connected to the inner wall of the metal cavity body. The multimode mixed cavity structure used in the filter has the advantages that the structure is simple,the installation and use are convenient, and the problem that the electromagnetic field is trapped in the resonance rod, which causes difficult coupling is avoided by changing the medium resonance rod in the multimode cavity body medium resonator into the metal resonance rod or the resonance rod with a metalized surface.

Description

technical field [0001] The invention relates to a multimode hybrid cavity structure applied in a filter, belongs to the technical field of passive antenna feed devices in the communication field, and in particular relates to a multimode hybrid cavity structure applied in a filter. Background technique [0002] With the rapid development of the fourth-generation mobile communication to the fifth-generation mobile communication, the requirements for high performance and miniaturization of communication equipment are increasing. The traditional cavity filter mostly adopts the single metal resonant rod method. Although this method is simple in structure, But only TEM single-mode resonance can be formed. When TEM multi-mode resonance is required in some occasions, it is necessary to arrange a resonant single cavity for each resonant rod, and a single cavity forms a resonance mode; this arrangement will lead to filter The whole machine is too big and the cost is too high. [0003...

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Problems solved by technology

[0005] Aiming at the defects in the above-mentioned prior art, the purpose of the present invention is to solve the above-mentioned background technology deficiencies, and provide a multi-mode hybrid cavity structure applied in the filter, which can realize the small size of the cavity filter. Frequency reduction requirements, while ensuring that the electromagnetic field generated by the resonant rod is not bound in the resonant rod, which is difficult to couple and is very suitable for low-frequency fields

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