阅读说明：本技术 一种腔体滤波器的可调强感性耦合结构 (Adjustable strong inductive coupling structure of cavity filter ) 是由 邓白玉 谢波 于 2020-11-30 设计创作，主要内容包括：本发明公开了一种腔体滤波器的可调强感性耦合结构,包括两个谐振腔和圆柱金属,在所述两个谐振腔之间设有一矩形柱体,所述矩形柱体与所述圆柱金属耦合连接等；本发明具有如下优点：具有耦合强度设计可调范围广、能满足强耦合需求、具有设计可调范围宽、加工简单、生产过程参数可调、尺寸适用性强、耦合强度大等优点。(The invention discloses a strength-adjustable inductive coupling structure of a cavity filter, which comprises two resonant cavities and cylindrical metal, wherein a rectangular cylinder is arranged between the two resonant cavities, and the rectangular cylinder is coupled with the cylindrical metal; the invention has the following advantages: the coupling strength adjustable range has the advantages of wide design adjustable range, capability of meeting the requirement of strong coupling, wide design adjustable range, simplicity in processing, adjustable parameters in the production process, strong size applicability, high coupling strength and the like.)

1. A tunable strong inductive coupling structure of a cavity filter comprises two resonant cavities and cylindrical metal, and is characterized in that a rectangular cylinder (333) is arranged between the two resonant cavities; the rectangular cylinder (333) is coupled with the cylindrical metal.

2. The tunable strong inductive coupling structure of a cavity filter according to claim 1, wherein the cylindrical metal comprises a tuning screw (111), and the tuning screw (111) is coupled to the rectangular cylinder (333).

3. The tunable strong inductive coupling structure of a cavity filter according to claim 1 or 2, wherein the length L, the width W and the height H of the rectangular cylinder (333) are all adjustable.

4. The tunable strong inductive coupling structure of a cavity filter according to claim 3, wherein the tuning screw (111) has an adjustable length B.

5. The tunable strong inductive coupling structure of a cavity filter according to claim 4, wherein a rectangular cylinder (333) is disposed between the two resonator bottoms.

Technical Field

The invention relates to the technical field of cavity filters, in particular to an adjustable strong inductive coupling structure of a cavity filter.

Background

The common coupling structure of the cavity filter can be divided into six types, namely space coupling, direct coupling, ridge coupling, magnetic ring coupling, diaphragm coupling and probe coupling, wherein except the probe coupling belonging to capacitive coupling, the rest are inductive coupling.

The spatial coupling realizes the adjustment of the coupling strength by changing the distance between two resonant cavities, is widely applied to the design of comb-shaped or interdigital filters in a straight-line form, and the coupling strength of the comb-shaped or interdigital filters can not meet the requirement under the condition of a specific structure size. The direct coupling can provide very strong coupling capability, but the assembly is inconvenient, the design adjustability is poor, and the adjustability of the physical processing is difficult to guarantee. The ridge adding coupling capacity is strong, the design time is adjustable, the problem of inconvenient processing exists, the object processing adjustability is poor, and the mass production is not facilitated. The magnetic ring coupling design is adjustable, but the problem that the processing is difficult to realize exists, and the object processing adjustability is poor, so that the magnetic ring coupling design is not beneficial to batch production. The diaphragm coupling is another coupling mode widely applied at present, has the characteristic of easy processing, but has weak coupling capability, and is mainly suitable for the design of a narrow-band filter.

In the prior art, for example, fig. 1 shows a conventional tunable inductive coupling method, in order to ensure the tunability, tuning screws (cylindrical metal coupling) are added, and the tuning screws need to ensure a sufficient distance between the tuning screws for convenient tuning, which means that the distance between two cavities of a miniaturized filter is not close enough, and the coupling coefficient is difficult to improve.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a strength-adjustable inductive coupling structure of a cavity filter, which has the advantages of wide design adjustable range of coupling strength, capability of meeting the requirement of strong coupling, wide design adjustable range, simplicity in processing, adjustable parameters in the production process, strong size applicability, high coupling strength and the like.

The purpose of the invention is realized by the following technical scheme:

a strength-adjustable inductive coupling structure of a cavity filter comprises two resonant cavities and cylindrical metal, wherein a rectangular cylinder is arranged between the two resonant cavities; the rectangular cylinder is coupled with the cylindrical metal.

Further, the cylindrical metal comprises a tuning screw rod, and the tuning screw rod is coupled with the rectangular cylinder.

Furthermore, the length L, the width W and the height H of the rectangular cylinder are adjustable.

Further, the length B of the tuning screw is adjustable.

Furthermore, the rectangular column is arranged between the bottoms of the two resonant cavities.

The invention has the beneficial effects that:

(1) compared with the existing cylindrical coupling mode, the invention has the advantages of wide adjustable range of coupling strength design, capability of meeting the strong coupling requirement and the like;

(2) compared with the existing strong coupling modes such as ridge coupling, direct coupling and the like, the method has the advantages of wide design adjustable range, simplicity in processing, adjustable production process parameters and the like;

(3) compared with the existing space coupling and diaphragm coupling modes, the invention has the advantages of strong size applicability, high coupling strength and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of a conventional tunable inductive coupling structure;

FIG. 2 is a diagram of a miniaturized cavity filter resonant cavity magnetic field distribution;

FIG. 3 is a schematic diagram of a coupling structure according to the present invention;

FIG. 4 is a diagram showing the implementation of strong inductive coupling and a very wide tuning range;

in the figure, 111-tuning screw, 333-rectangular cylinder.

Detailed Description

The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following. Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

As shown in fig. 1 to 4, a tunable strong inductive coupling structure of a cavity filter includes two resonant cavities and a cylindrical metal, and a rectangular cylinder 333 is disposed between the two resonant cavities; the rectangular cylinder 333 is coupled with the cylindrical metal.

Further, the cylindrical metal comprises a tuning screw 111, and the tuning screw 111 is coupled with the rectangular cylinder 333.

Further, the length L, width W and height H of the rectangular column 333 are adjustable.

Further, the length B of the tuning screw 111 is adjustable.

Further, a rectangular cylinder 333 is provided between the two resonator bottoms.

Example 1

As shown in fig. 1 to 4, those skilled in the art can implement the present invention as an adjustable strong inductive coupling structure of a cavity filter, which includes two resonant cavities and a cylindrical metal, and a rectangular cylinder 333 is disposed between the two resonant cavities; the rectangular cylinder 333 is coupled with the cylindrical metal, the coupling strength can be fully adjusted in a large range from the design aspect by changing the length, the width and the height of the rectangular cylinder, the narrow-band requirement can be met, the wide-band strong coupling can be realized, and the production adjustability is met by matching with a cylindrical metal coupling mode (tuning screw); the rectangular column 333 is arranged between the bottoms of the two resonant cavities, and a tuning screw 111 is arranged; changing the length L, width and height of the rectangular cylinder and the length B of the tuning screw, and matching square cylinder coupling with cylindrical coupling; the rectangular cylinder is additionally arranged between the bottoms of the two resonant cavities which are far away from each other, the coupling strength can be fully adjusted in a large range from the design by changing the length, the width and the height of the rectangular cylinder, the narrow-band requirement can be met, the strong coupling of the wide band can be realized, and the debugging performance of production is met by matching with a cylindrical metal coupling mode (tuning screw). The structure is applied in the simulation of the actual filter design, the length L, the width W, the height H and the tuning screw length B of the rectangular cylinder are changed, the coupling parameter range shown in the following figure is obtained, the coupling coefficient is different from 0.0117 to 0.059, and strong inductive coupling and a very wide adjustable range are realized.

Modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, which should be limited only by the appended claims. In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known techniques, such as specific construction details, operating conditions, and other technical conditions, have not been described in detail in order to avoid obscuring the present invention.