CN201887138U - Resonant cavity of filter - Google Patents

Resonant cavity of filter Download PDF

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Publication number
CN201887138U
CN201887138U CN2010206587399U CN201020658739U CN201887138U CN 201887138 U CN201887138 U CN 201887138U CN 2010206587399 U CN2010206587399 U CN 2010206587399U CN 201020658739 U CN201020658739 U CN 201020658739U CN 201887138 U CN201887138 U CN 201887138U
Authority
CN
China
Prior art keywords
resonant cavity
coupling
adjusting screw
filter
coupled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2010206587399U
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Chinese (zh)
Inventor
黎良琼
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SICHUAN QUANXING LOGISTICS CO Ltd
Original Assignee
SICHUAN QUANXING LOGISTICS CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SICHUAN QUANXING LOGISTICS CO Ltd filed Critical SICHUAN QUANXING LOGISTICS CO Ltd
Priority to CN2010206587399U priority Critical patent/CN201887138U/en
Application granted granted Critical
Publication of CN201887138U publication Critical patent/CN201887138U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses a resonant cavity of a filter, which belongs to the technical field of wireless communication, and mainly solves the problem that a conventional cavity filter has difficulty in achieving stronger electric coupling. The resonant cavity of the filter comprises a resonant cavity main body, wherein coupling structures are arranged on the outer wall of the resonant cavity main body; an adjusting screw rod is arranged in one of the coupling structures; the distance between the end of the adjusting screw rod positioned in the coupling structure and the bottom of the coupling structure is at least 1cm smaller than one third of the maximum size of the coupling structure in the direction perpendicular to the axis of the adjusting screw rod; and a metal head is arranged at the end of the adjusting screw rod positioned in the coupling structure. The resonant cavity of the filter has a simple structure, is convenient to process, can not only achieve stronger electric coupling, but also flexibly adjust the coupling coefficient without influencing the resonant frequency, and is mainly applied to base station communication and an indoor coverage system.

Description

A kind of resonant cavity of filter
Technical field
The utility model relates to resonant cavity, specifically, relates to a kind of resonant cavity of cavity body filter.
Background technology
Cavity body filter is because advantage such as its volume compact, adjustability are good, the outer suppression characteristic of band is good particularly owing to the cross-couplings The Application of Technology, in recent years, has obtained fast development in radio communication base station and indoor covering system.
But, constituting in the coaxial resonant cavity of cavity body filter, electric field energy concentrates between the resonant cavity lid of inner wire top; Simultaneously, in order to process, connect by the hole slot coupling between the coaxial resonant cavity, and these hole seams end the microwave with resonant cavity resonance frequency with easy to assembly.Above-mentioned two reasons make the stiffness of coupling between the coaxial resonant cavity be subjected to great restriction.
Suppress outward in order to obtain good band, usually need between coaxial resonant cavity, realize electric coupling.Conventional electric coupling structure is an insulated metal post that connects resonant cavity and other conductor.In cavity body filter, usually need very strong coupling between the resonant cavity.In order to obtain very strong electric coupling, the insulated metal post that is adopted must stretch into the depths of resonant cavity, and this just will bring two problems: the one, and the shape of this insulated metal post and position will have a strong impact on the resonance frequency of resonant cavity; The 2nd, the coupling coefficient of this electric coupling structure that is made of the insulated metal post is difficult to be regulated from the resonant cavity outside.
In sum, stable resonance frequency, adjustability and than the contradiction between the close coupling flexibly make function admirable, the cavity body filter that volume is very little be difficult to satisfactory to both parties neat U.S..
The utility model content
The purpose of this utility model is to provide a kind of resonant cavity of filter, solves problems of the prior art, under the prerequisite of the resonance frequency that does not influence resonant cavity, realizes very strong electric coupling, and realizes the flexible to electric coupling structure coupling coefficient.
To achieve these goals, the technical solution adopted in the utility model is as follows:
A kind of resonant cavity of filter comprises the resonant cavity body, and described resonant cavity body outer wall is provided with coupled structure, is provided with adjusting screw(rod) in the coupled structure.
Further, described adjusting screw(rod) be positioned at the inner end termination of coupled structure and this coupled structure bottom distance at least than this coupled structure at maximum sized 1/3 also little 1cm perpendicular to adjusting screw(rod) axis direction.
Further, the described adjusting screw(rod) end termination that is positioned at coupled structure inside is provided with ferrule.
Again further, described ferrule in adjusting screw(rod) full-size transversely at least than the big 1cm of diameter of section of adjusting screw(rod) maximum.
Also be provided with metal column in the described resonant cavity body.
Design principle of the present utility model: utilize adjusting screw(rod) and ferrule to stretch in the coupled structure, form resonance structure jointly.Wherein, when adjusting screw(rod) and ferrule stretch in the coupled structure when superficial, the resonance frequency of this coupled structure will be higher than the resonance frequency of resonant cavity, and near the resonant cavity resonance frequency, this structure is the magnetic coupling structure; When adjusting screw(rod) and ferrule stretch in the coupled structure when deep, the resonance frequency of this coupled structure will be lower than the resonance frequency of resonant cavity, and near the resonant cavity resonance frequency, this structure is the electric coupling structure.
Compared with prior art, advantage of the present utility model is:
One. the utility model is simple in structure, and is easy to process.Only need on the common wall between the adjacent resonators processing seam that portals, ferrule with pass adjusting screw(rod) that the filter upper cover plate enters coupled structure inside and link to each other and get final product.
Two. because coupling unit is positioned at the resonant cavity outside fully, therefore, its coupling amount can in very large range be regulated outside resonant cavity, and the adjustable range of the coupling amount of insulated metal rod structure is limited, shows especially under the situation that needs the forceful electric power coupling.
In sum, the utility model is not only realized very strong electric coupling, all right flexible coupling coefficient, and also simple in structure, easy to process.The utility model is mainly used in wireless communication field, has very high practical value.
Description of drawings
Fig. 1 is a vertical view of the present utility model.
Fig. 2 is that the A-A of Fig. 1 is to cutaway view.
Fig. 3 is the structural representation of the utility model-embodiment.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
Embodiment
Shown in Fig. 1~2, a kind of resonant cavity of filter, comprise resonant cavity body 1, described resonant cavity body 1 outer wall is provided with coupled structure 2, be provided with adjusting screw(rod) 3 in the coupled structure 2, described adjusting screw(rod) stretches into coupled structure 2 inside from resonant cavity body 1 outside, and an end that stretches into coupled structure 2 inside is provided with ferrule 4, also is provided with metal column 5 in the described resonant cavity body 1.
As shown in Figure 3, in the resonant cavity of band resonance coupled structure, resonant cavity body 1, three coupled structures 2, metal columns 5 are rectangle.Three coupled structures lay respectively on three limits of resonant cavity body, one is coaxial configuration, one is rectangle coupling slot, the 3rd is provided with one and stretches into its inner adjusting screw(rod) 3 outside resonant cavity body 1, adjusting screw(rod) 3 terminations that are positioned at these coupled structure 2 inside are provided with ferrule 4, ferrule 4 is at the lateral dimension of this adjusting screw(rod) also big 15mm of diameter than adjusting screw(rod) maximum cross-section, and, the termination that described adjusting screw(rod) 3 stretches into coupled structure 2 with the distance of these coupled structure 2 bottoms at least than this coupled structure 2 at maximum sized 1/5 little 15mm perpendicular to adjusting screw(rod) 3 axis directions.
The adjusting adjusting screw(rod) stretches into the degree of depth of coupled structure 2, only need externally rotate adjusting screw(rod) 3 gets final product, because the resonance electric coupling structure of being made up of coupled structure 2 and adjusting screw(rod), ferrule 4 is positioned at outside the resonant cavity fully, therefore regulating the degree of depth of adjusting screw(rod) in coupled structure can't influence the resonance frequency of resonant cavity, thereby has avoided the contradiction between stronger electric coupling and the stable resonance frequency.
Just can realize the utility model well according to the foregoing description, but protection range of the present utility model is not limited in the foregoing description.

Claims (5)

1. the resonant cavity of a filter comprises resonant cavity body (1), it is characterized in that, described resonant cavity body (1) outer wall is provided with coupled structure (2), is provided with adjusting screw(rod) (3) in the coupled structure (2).
2. the resonant cavity of a kind of filter according to claim 1, it is characterized in that, the distance that described adjusting screw(rod) (3) is positioned at the inner end termination of coupled structure (2) and this coupled structure bottom at least than this coupled structure (2) at maximum sized 1/3 also little 1cm perpendicular to adjusting screw(rod) (3) axis direction.
3. the resonant cavity of a kind of filter according to claim 2 is characterized in that, described adjusting screw(rod) (3) is positioned at the inner end termination of coupled structure (2) and is provided with ferrule (4).
4. the resonant cavity of a kind of filter according to claim 3 is characterized in that, described ferrule (4) is at more maximum than adjusting screw(rod) (4) at least big 1cm of diameter of section of adjusting screw(rod) (3) full-size transversely.
5. the resonant cavity of a kind of filter according to claim 4 is characterized in that, also is provided with metal column (5) in the described resonant cavity body (1).
CN2010206587399U 2010-12-14 2010-12-14 Resonant cavity of filter Expired - Fee Related CN201887138U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010206587399U CN201887138U (en) 2010-12-14 2010-12-14 Resonant cavity of filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010206587399U CN201887138U (en) 2010-12-14 2010-12-14 Resonant cavity of filter

Publications (1)

Publication Number Publication Date
CN201887138U true CN201887138U (en) 2011-06-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2010206587399U Expired - Fee Related CN201887138U (en) 2010-12-14 2010-12-14 Resonant cavity of filter

Country Status (1)

Country Link
CN (1) CN201887138U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104241752A (en) * 2014-09-10 2014-12-24 江苏贝孚德通讯科技股份有限公司 Dielectric filter
WO2019041672A1 (en) * 2017-09-01 2019-03-07 广东工业大学 Coaxial tm10,1,0 mode coupled cavity chain

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104241752A (en) * 2014-09-10 2014-12-24 江苏贝孚德通讯科技股份有限公司 Dielectric filter
CN104241752B (en) * 2014-09-10 2016-08-24 江苏贝孚德通讯科技股份有限公司 A kind of dielectric filter
WO2019041672A1 (en) * 2017-09-01 2019-03-07 广东工业大学 Coaxial tm10,1,0 mode coupled cavity chain

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Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110629

Termination date: 20111214