CN112072233A - High-pass radio frequency filter - Google Patents

High-pass radio frequency filter Download PDF

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Publication number
CN112072233A
CN112072233A CN202010854167.XA CN202010854167A CN112072233A CN 112072233 A CN112072233 A CN 112072233A CN 202010854167 A CN202010854167 A CN 202010854167A CN 112072233 A CN112072233 A CN 112072233A
Authority
CN
China
Prior art keywords
resonant
fixed
movable
tuning screw
column
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.)
Pending
Application number
CN202010854167.XA
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Chinese (zh)
Inventor
尹桂芳
汪海港
张主霖
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.)
Anhui Lanxun Electronic Technology Co ltd
Original Assignee
Anhui Lanxun Electronic Technology 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 Anhui Lanxun Electronic Technology Co ltd filed Critical Anhui Lanxun Electronic Technology Co ltd
Priority to CN202010854167.XA priority Critical patent/CN112072233A/en
Publication of CN112072233A publication Critical patent/CN112072233A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00Auxiliary devices
    • H01P1/20Frequency-selective devices, e.g. filters
    • H01P1/207Hollow waveguide filters

Abstract

The invention discloses a high-pass radio frequency filter, which comprises a resonant cavity, a cover plate and a resonant column arranged in the resonant cavity, wherein the length of the resonant column is adjustable, the resonant column is connected with a tuning screw rod, the tuning screw rod penetrates out of the cover plate and realizes the adjustment of the working length of the resonant column in the resonant cavity, the resonant column comprises a fixed part fixedly connected with the inner surface of the cover plate and a movable part sleeved with the fixed part, and the movable part is fixedly connected with the tuning screw rod; the high-pass radio frequency filter solves the problems of arrangement of various structures and components in a resonant cavity of the filter in the prior art, avoids sharp angles in the resonant cavity, and has adjustable length of a resonant column and high output frequency.

Description

High-pass radio frequency filter
Technical Field
The invention belongs to the field of filters, and particularly relates to a high-pass radio frequency filter.
Background
The cavity filter is used as a frequency selection device for selecting communication signal frequency and filtering out clutter or interference signals outside the communication signal frequency, and is widely applied to various signal base stations. The existing cavity filter generally comprises a cavity and a cover plate, wherein the cover plate covers the cavity to form a resonant cavity, a resonant column extending towards the cover plate is arranged at the bottom of the resonant cavity, and the resonant column is in a cylindrical shape with one closed end and one open end. And a tuning screw rod extending towards the interior of the resonant column is arranged on the cover plate so as to adjust the frequency of the cavity filter.
The existing resonant column mounting modes are two, and the first mode is as follows: punching a single cylindrical resonance column, processing an installation boss at the bottom of the cavity, and fixing the resonance column on the installation boss by using screws. This approach has several drawbacks: 1) for a cavity with a smaller volume, the space proportion occupied by the mounting boss is larger, so that the insertion loss of the cavity filter can be increased; 2) the contact surface of the resonance column and the mounting boss is uneven, so that poor contact between the resonance column and the mounting boss is caused, and intermodulation and insertion loss of the cavity filter are further influenced. 3) The resonant columns have certain assembly errors, so that the distance between the adjacent resonant columns and the flying rod cannot meet the preset requirement, and the coupling index between the resonant columns and the flying rod is further influenced.
The second way is: and (4) integrally punching and forming the resonant column and the cavity. Although this method overcomes the problems of the first solution, it has several disadvantages as follows: 1) the resonant column must be made of aluminum alloy material as the cavity, and the volume of the aluminum alloy is greatly influenced by the temperature change, so that the resonant column cannot be made in the mode for cavity filters with higher temperature drift requirements. 2) The tuning screw is positioned in the resonant cavity and is in capacitive coupling with the resonant column, and the threaded part on the outer surface of the tuning screw is relatively sharp, so that point discharge can be caused, and power ignition can be generated. 3) The cavity structure is complex, so the requirement on the stamping die is high.
Disclosure of Invention
The invention aims to provide a high-pass radio frequency filter, which solves the problems of arrangement of various structures and components in a resonant cavity of the filter in the prior art, avoids sharp angles in the resonant cavity, and has adjustable length of a resonant column and high output frequency.
The high-pass radio frequency filter comprises a resonant cavity, a cover plate and a resonant column arranged in the resonant cavity, wherein the length of the resonant column is adjustable, the resonant column is connected with a tuning screw rod, and the tuning screw rod penetrates out of the cover plate and realizes that the resonant column participates in adjusting the working length in the resonant cavity.
Preferably, the resonance column comprises a fixed part fixedly connected with the inner surface of the cover plate and a movable part sleeved with the fixed part, and the movable part is fixedly connected with the tuning screw rod.
Preferably, the fixed part and the movable part are both cylindrical, one end of the fixed part is fixedly connected with the inner surface of the cover plate, and the other end of the fixed part faces the bottom surface of the resonant cavity and is provided with an inner limiting shoulder; the coaxial cover of movable part is established inside the fixed part, the movable part is placed inside the fixed part and is provided with outer spacing shoulder, interior spacing shoulder and outer spacing shoulder realize the coaxial setting of fixed part and movable part in step.
Preferably, the movable part is provided with a connecting piece at the outer end of the fixed part, and the tuning screw is fixedly connected with the connecting piece.
Preferably, the connecting piece includes the connecting plate with activity portion inner wall welded, be provided with the mounting hole on the connecting plate, tuning screw passes the mounting hole and is provided with lock nut.
Preferably, the lock nut comprises a nut and a hemispherical cap body sleeved outside the nut, and the nut is welded with the hemispherical cap body.
The high-pass radio frequency filter has the beneficial effects that:
1. simple structure has avoided the installation of multiple spare part in the cavity and the existence of sharp angle in many places cavity among the prior art, and filtering job stabilization has avoided point discharge.
2. Only the resonant column is arranged in the resonant cavity, the length of the resonant column is adjustable, the adjusting range is wide, and the resonant frequency is selected more.
Drawings
Figure 1 is a schematic diagram of a high-pass rf filter according to the present invention,
figure 2 is a schematic view of the structure of the movable part,
figure 3 is a schematic view of a lock nut construction.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
As shown in fig. 1, a high-pass rf filter according to an embodiment of the present invention includes a resonant cavity 1, a cover plate 2, and a resonant column 3 disposed in the resonant cavity 1. The length of the resonant column 3 is adjustable, the resonant column 3 is connected with a tuning screw rod 4, and the tuning screw rod 4 penetrates out of the cover plate 2 and realizes that the resonant column 3 participates in the adjustment of the working length in the resonant cavity 1. The problem that the resonant column and the tuning screw are respectively installed in the resonant cavity in the prior art is solved, excessive installation parts are avoided, and installation is simplified; the problem that only a tuning screw adjusts the frequency in the prior art is solved, so that adjustment parameters are diversified, the frequency adjustment precision is improved, and a frequency adjustment range with wider range and more frequency values is obtained; excessive sharp angles in the resonant cavity are avoided, sharp angles are avoided, point discharge is avoided, and filtering work is stable.
As shown in fig. 1, the resonant column 3 includes a fixed portion 31 fixedly connected to the inner surface of the cover plate 2 and a movable portion 32 sleeved on the fixed portion 31, and the movable portion 32 is fixedly connected to the tuning screw 4. The tuning screw 4 adjusts the length of the resonant column 3, namely, the resonant frequency, by adjusting the position of the movable part 32.
As shown in fig. 1 and fig. 2, the fixed portion 31 and the movable portion 32 are both cylindrical, one end of the fixed portion 31 is fixedly connected to the inner surface of the cover plate 2, and the other end faces the bottom surface of the resonant cavity 1 and is provided with an inner limit shoulder 34. The movable part 32 is coaxially sleeved inside the fixed part 31, the movable part 32 is arranged inside the fixed part 31 and provided with an outer limiting shoulder 33, and the inner limiting shoulder 34 and the outer limiting shoulder 33 synchronously realize the coaxial arrangement of the fixed part 31 and the movable part 32. The fixed part 31 is connected convenient and reliable with the movable part 32, utilizes the fixed part to realize spacing to the movable part position, avoids its skew and rocks, utilizes tuning screw to realize adjusting the activity not position, connects reliably, adjusts the convenience.
As shown in fig. 2, the movable portion 32 is provided with a connecting member 35 at the end outside the fixed portion 31, and the tuning screw 4 is fixedly connected to the connecting member 35. The connecting piece 35 comprises a connecting plate welded with the inner wall of the movable part 32, a mounting hole 36 is formed in the connecting plate, and the tuning screw 4 penetrates through the mounting hole 36 and is provided with a locking nut 5. As shown in fig. 3, the lock nut 5 includes a nut 51 and a hemispherical cap 52 covering the nut 51, and the nut 51 and the hemispherical cap 52 are welded together. The provision of the hemispherical cap 52 avoids exposing the sharp corners at the end of the tuning screw and the end of the nut 51, and avoids the occurrence of a tip discharge.
It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by one of ordinary skill in the art and related arts based on the embodiments of the present invention without any creative effort, shall fall within the protection scope of the present invention. Structures, devices, and methods of operation not specifically described or illustrated herein are generally practiced in the art without specific recitation or limitation.

Claims (6)

1. A high-pass radio frequency filter is characterized by comprising a resonant cavity, a cover plate and a resonant column arranged in the resonant cavity, wherein the length of the resonant column is adjustable, a tuning screw rod is connected to the resonant column, and the tuning screw rod penetrates out of the cover plate and realizes that the resonant column participates in the adjustment of the working length in the resonant cavity.
2. The high pass rf filter according to claim 1, wherein the resonant post comprises a fixed portion fixedly connected to the inner surface of the cover plate and a movable portion sleeved with the fixed portion, the movable portion being fixedly connected to the tuning screw.
3. The high-pass radio frequency filter according to claim 2, wherein the fixed part and the movable part are both cylindrical, one end of the fixed part is fixedly connected with the inner surface of the cover plate, and the other end of the fixed part faces the bottom surface of the resonant cavity and is provided with an inner limiting shoulder; the coaxial cover of movable part is established inside the fixed part, the movable part is placed inside the fixed part and is provided with outer spacing shoulder, interior spacing shoulder and outer spacing shoulder realize the coaxial setting of fixed part and movable part in step.
4. The high pass rf filter according to claim 2, wherein the movable portion is provided with a connecting member at an end thereof located outside the fixed portion, and the tuning screw is fixedly connected to the connecting member.
5. The high-pass radio frequency filter according to claim 4, wherein the connecting member comprises a connecting plate welded to the inner wall of the movable portion, the connecting plate is provided with a mounting hole, and the tuning screw penetrates through the mounting hole and is provided with a lock nut.
6. The high pass rf filter according to claim 5, wherein the lock nut comprises a nut and a hemispherical cap body disposed outside the nut, and the nut and the hemispherical cap body are welded.
CN202010854167.XA 2020-08-24 2020-08-24 High-pass radio frequency filter Pending CN112072233A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010854167.XA CN112072233A (en) 2020-08-24 2020-08-24 High-pass radio frequency filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010854167.XA CN112072233A (en) 2020-08-24 2020-08-24 High-pass radio frequency filter

Publications (1)

Publication Number Publication Date
CN112072233A true CN112072233A (en) 2020-12-11

Family

ID=73659180

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010854167.XA Pending CN112072233A (en) 2020-08-24 2020-08-24 High-pass radio frequency filter

Country Status (1)

Country Link
CN (1) CN112072233A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5986526A (en) * 1997-03-03 1999-11-16 Ems Technologies Canada, Ltd. RF microwave bellows tuning post
CN202262222U (en) * 2011-10-25 2012-05-30 保定天威集团有限公司 Shielding case for shielding discharge at pointed end of end part of bolt
CN102610887A (en) * 2012-03-22 2012-07-25 深圳市大富科技股份有限公司 Adjustable filter
CN203119067U (en) * 2013-01-25 2013-08-07 华为技术有限公司 Cavity filter
CN203607525U (en) * 2013-12-11 2014-05-21 武汉凡谷电子技术股份有限公司 Resonance rod assembly structure
CN203747003U (en) * 2014-01-02 2014-07-30 广州海格通信集团股份有限公司 Adjustable cavity filter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5986526A (en) * 1997-03-03 1999-11-16 Ems Technologies Canada, Ltd. RF microwave bellows tuning post
CN202262222U (en) * 2011-10-25 2012-05-30 保定天威集团有限公司 Shielding case for shielding discharge at pointed end of end part of bolt
CN102610887A (en) * 2012-03-22 2012-07-25 深圳市大富科技股份有限公司 Adjustable filter
CN203119067U (en) * 2013-01-25 2013-08-07 华为技术有限公司 Cavity filter
CN203607525U (en) * 2013-12-11 2014-05-21 武汉凡谷电子技术股份有限公司 Resonance rod assembly structure
CN203747003U (en) * 2014-01-02 2014-07-30 广州海格通信集团股份有限公司 Adjustable cavity filter

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