Outward-convex cavity three-mode resonant structure and filter with resonant structure

Abstract

The invention discloses an outward-convex cavity multi-mode resonant structure and a filter with the resonant structure. The resonant structure comprises a cavity and a cover plate; a dielectric resonant block and a dielectric supporting frame are arranged in the cavity; at least one end plane of the cavity and / or the dielectric resonant block is convex outwards; the dielectric resonant block andthe dielectric supporting framework form a three-mode dielectric resonant rod; one end or any end of the similar-cubic dielectric resonant block is connected with the dielectric supporting frame separately; the dielectric supporting frame is connected with the inner wall of the cavity; and the dielectric resonant block forms three-mode resonance in three directions of X, Y and Z axis in the cavity. By the adoption of the cavity filter provided by the invention, a high Q value can be obtained while a relatively small distance between the resonant rod and the cavity is ensured, and the tuning range of a tuning screw rod is enlarged; and meanwhile, the sensitivity of the small spacing between the cavity and the dielectric resonant block to the resonance frequency is reduced, the production and debugging are facilitated, and the production cost is lowered.

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. The convex cavity three-mode resonant structure and the filter containing the convex cavity three-mode 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-...

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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 walls 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 the single cavity, which is not conducive to the mass production of the dielectric resonator block; 3. Because the distance 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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