Recessed cavity three-mode resonant structure and filter comprising same

Abstract

The invention discloses a recessed cavity multi-mode resonant structure and a filter comprising the same. The recessed cavity three-mode resonant structure comprises a cavity and a cover plate, wherein a medium resonant block and a medium supporting rack are arranged in the cavity; at least one end surface of the cavity and / or the medium resonant block is recessed; the medium resonant block and the medium supporting rack form a three-mode medium resonant rod; one end or an optional end of a similar square medium resonant block is separately connected with the medium supporting rack; the mediumsupporting rack is connected with the inner wall of the cavity; the medium resonant block and the m edium supporting rack form three-mode resonance in the X-axis direction, the Y-axis direction and the Z-axis direction of the cavity. By the cavity multi-mode filter, it can be ensured that high Q value can be obtained under a small distance between the resonant rod and the cavity, the tuning rangeof a tuning screw is expanded, meanwhile, the sensitivity of a small distance between the cavity and the medium resonant block to resonant frequency is reduced, production and debugging are facilitated, and the production cost is reduced.

Description

technical field [0001] The invention relates to base station filters, antenna feeder filters, combiners and anti-interference filters used in the field of wireless communication. The types of filters can be band-pass, band-stop, high-pass and low-pass. Concave cavity triple-mode resonant structure and filter containing the resonant structure. Background technique [0002] With the rapid development of the fourth-generation mobile communication to the fifth-generation mobile communication, the requirements for miniaturization and high performance of communication equipment are getting higher and higher. Traditional filters are gradually replaced by single-mode dielectric filters due to their large metal cavity and general performance. Single-mode dielectric filters mainly include TE01-mode dielectric filters and TM-mode dielectric filters, TE01-mode dielectric filters and TM-mode dielectric filters. Mode dielectric filters generally use single-mode dielectric resonance. Alth...

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Problems solved by technology

However, this structure has the following technical problems: 1. Because the distance between the dielectric resonator block and the inner wall of the cavity is extremely small, the adjustment range of the tuning screw is limited, which is not conducive to the installation and debugging of the dielectric resonator block; The distance between the inner wall of the cavity is extremely small, so the distance between the dielectric resonator block and the cavity is highly sensitive to the resonance frequency of a single mode, which is not conducive to the mass production of the dielectric resonator block; 3. Because the pole between the dielectric resonator block and the inner wall of the cavity The small spacing is highly sensitive to the resonance frequency of a single cavity, so the design accuracy of the dielectric resonator block and the cavity is extremely high, which increases the manufacturing cost

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