CN112072232A - Cavity filter and communication radio frequency equipment - Google Patents
Cavity filter and communication radio frequency equipment Download PDFInfo
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- CN112072232A CN112072232A CN202010854158.0A CN202010854158A CN112072232A CN 112072232 A CN112072232 A CN 112072232A CN 202010854158 A CN202010854158 A CN 202010854158A CN 112072232 A CN112072232 A CN 112072232A
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- cavity
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
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Abstract
The invention discloses a cavity filter, which comprises a resonant cavity and a cover plate for sealing the resonant cavity, wherein a resonant column is arranged in the resonant cavity, the top end of the resonant column penetrates through the cover plate and is connected with a tuning screw rod, an adjusting bracket is connected onto the tuning screw rod, and the position of the resonant column in the resonant cavity is adjusted by adjusting the position of the tuning screw rod on the adjusting bracket; the cavity filter and the communication radio frequency equipment overcome the arrangement of various structures and components in the resonant cavity in the prior art, avoid the existence of sharp angles in the cavity or the resonant cavity, and simultaneously have large position adjusting range of the resonant column and more resonant frequency selections.
Description
Technical Field
The invention belongs to the field of communication equipment, and particularly relates to a cavity filter and communication radio frequency equipment.
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 cavity filter and communication radio frequency equipment, which overcome the arrangement of various structures and components in a resonant cavity in the prior art, avoid the existence of sharp angles in the cavity or the cavity, and simultaneously have large position adjusting range of a resonant column and more resonant frequency selections.
According to the technical scheme, the cavity filter comprises a resonant cavity and a cover plate used for sealing the resonant cavity, a resonant column is arranged in the resonant cavity, the top end of the resonant column penetrates through the cover plate and is connected with a tuning screw, an adjusting support is connected to the tuning screw, and the position of the resonant column in the resonant cavity is adjusted by adjusting the position of the tuning screw on the adjusting support.
Preferably, the cover plate is provided with a counter bore, the resonance column penetrates through the counter bore, the counter bore comprises a small cylinder hole and a large cylinder hole, the diameter of the small cylinder hole is matched with that of the resonance column, and a sealing ring sleeved outside the resonance column is arranged in the large cylinder hole.
Preferably, the outer end of the large cylindrical hole is connected with an outer cylinder, the inner surface of the outer cylinder is provided with threads and is in threaded connection with a sleeve, and the sleeve is sleeved on the resonance column and compresses the sealing ring in the large cylindrical hole to seal the resonance column and the small cylindrical hole.
Preferably, the sealing ring is made of soft metal materials or made of metal sheets to form a ring body with certain telescopic capacity.
Preferably, the height of the resonant column is greater than the sum of the heights of the resonant cavity and the cover plate.
Preferably, the adjusting bracket is fixedly connected with the cover plate, a screw hole is formed in the adjusting bracket, the tuning screw penetrates through the screw hole, and a fixing nut is sleeved at the upper part of the adjusting bracket.
Preferably, the resonant column is in a hollow cylinder shape, the connecting end of the resonant column and the tuning screw is closed, and the cover plate is welded with the resonant cavity.
A communication radio frequency device comprises a receiving filter and a transmitting filter, wherein the receiving filter is connected between a receiving terminal and an antenna terminal, the transmitting filter is connected between a transmitting terminal and the antenna terminal, and the receiving filter and the transmitting filter are the cavity filter.
The cavity filter of the technical scheme of the invention 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.
The communication radio frequency equipment of the technical scheme of the invention has the beneficial effects that: the frequency selection device has wide range and stable performance.
Drawings
Fig. 1 is a schematic structural diagram of a cavity filter according to the technical solution of the present invention,
fig. 2 is a schematic diagram of another state of a cavity filter according to the present invention,
fig. 3 is a schematic diagram of a cavity structure.
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, the cavity filter according to the present technical solution includes a resonant cavity 1 and a cover plate 2 for sealing the resonant cavity 1, where a resonant column 8 is disposed in the resonant cavity 1. The top end of the resonance column 8 penetrates through the cover plate 2 and is connected with a tuning screw 7, the tuning screw 7 is connected with an adjusting support 5, and the position of the resonance column 8 in the resonant cavity 1 is adjusted by adjusting the position of the tuning screw 7 on the adjusting support 5.
The arrangement of the resonant column 8 and the resonant cavity 1 in the technical scheme has the advantages of simple structure, capability of avoiding the installation of various parts in the cavity and the existence of sharp angles in multiple cavities in the prior art, stable filtering work and capability of avoiding point discharge. The length of the resonant column 8 in the resonant cavity 1 is adjustable, and the frequency acquisition range is wide.
As shown in fig. 1 and 3, a counter bore is arranged on the cover plate 2, and the resonance column 8 passes through the counter bore. The counter bore comprises a small cylindrical hole 10 and a large cylindrical hole 11, the diameter of the small cylindrical hole 10 is matched with that of the resonance column 8, and when the resonance column 8 passes through, friction cannot occur between the small cylindrical hole 10 and the small cylindrical hole. And a sealing ring 9 sleeved outside the resonant column 8 is arranged in the large cylindrical hole 11. Sealing washer 9 realizes sealed between resonance post 8 and the apron, avoids filtering to reveal.
As shown in fig. 1 and 3, the outer end of the large cylindrical hole 11 is connected with an outer cylinder 3, the inner surface of the outer cylinder 3 is provided with a thread 30 and is screwed with a sleeve 4, the sleeve 4 is sleeved on the resonance column 8 and compresses the seal ring 9 in the large cylindrical hole 11, and the resonance column 8 and the small cylindrical hole 10 are sealed. The sealing ring 9 is made of soft metal or made of metal sheet into a ring body with certain telescopic capacity. The sealing ring 9, the cavity and the cover plate are all made of metal materials and have the functions of isolation and shielding.
The height of the resonant column 8 is greater than the sum of the heights of the resonant cavity 1 and the cover plate 2. Ensure that the resonance column 8 is always sealed with the cover plate 2
The adjusting support 5 is fixedly connected with the cover plate 1, a screw hole is formed in the adjusting support 5, the tuning screw 7 penetrates through the screw hole, and a fixing nut 6 is sleeved at the upper portion of the adjusting support 5. The tuning screw 7 is rotated to drive the resonant column 8 to lift in the resonant cavity 1, so that frequency adjustment is realized, and the tuning screw 7 is fixed by the fixing nut 6.
The resonance column 8 is in a hollow cylinder shape, the connection end of the resonance column and the tuning screw 7 is closed, and the cover plate 2 is welded with the resonance cavity 1. And welding is adopted, so that the use of mounting parts is reduced.
A communication radio frequency device comprises a receiving filter and a transmitting filter, wherein the receiving filter is connected between a receiving terminal and an antenna terminal, the transmitting filter is connected between a transmitting terminal and the antenna terminal, and the receiving filter and the transmitting filter are the cavity filter.
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 (8)
1. The cavity filter is characterized by comprising a resonant cavity and a cover plate used for sealing the resonant cavity, wherein a resonant column is arranged in the resonant cavity, the top end of the resonant column penetrates through the cover plate and is connected with a tuning screw rod, an adjusting support is connected onto the tuning screw rod, and the position of the resonant column in the resonant cavity is adjusted by adjusting the position of the tuning screw rod on the adjusting support.
2. The cavity filter of claim 1, wherein the cover plate is provided with a counter bore, the resonant column passes through the counter bore, the counter bore comprises a small cylindrical hole and a large cylindrical hole, the diameter of the small cylindrical hole is matched with that of the resonant column, and a sealing ring sleeved outside the resonant column is arranged in the large cylindrical hole.
3. The cavity filter of claim 2, wherein an outer cylinder is connected to the outer end of the large cylinder hole, a screw thread is arranged on the inner surface of the outer cylinder, and a sleeve is screwed on the inner surface of the outer cylinder, and the sleeve is sleeved on the resonance column and compresses the sealing ring in the large cylinder hole to seal the resonance column with the small cylinder hole.
4. The cavity filter of claim 2, wherein the cover plate is provided with a counter bore, and the sealing ring is made of soft metal or made of metal sheet into a ring body with a certain telescopic capability.
5. The cavity filter of claim 1, wherein the resonant column height is greater than the sum of the resonant cavity and the cover plate height.
6. The cavity filter of claim 1, wherein the adjusting bracket is fixedly connected to the cover plate, the adjusting bracket is provided with a screw hole, the tuning screw passes through the screw hole, and a fixing nut is sleeved on the upper portion of the adjusting bracket.
7. The cavity filter according to claim 1, wherein the resonating cylinder is in the shape of a hollow cylinder, and is closed at the tuning screw connection end, and the cover plate is welded to the resonating cavity.
8. A communication radio frequency device comprising a receiving filter and a transmitting filter, wherein the receiving filter is connected between a receiving terminal and an antenna terminal, the transmitting filter is connected between a transmitting terminal and the antenna terminal, and the receiving filter and the transmitting filter are the cavity filter of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010854158.0A CN112072232A (en) | 2020-08-24 | 2020-08-24 | Cavity filter and communication radio frequency equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010854158.0A CN112072232A (en) | 2020-08-24 | 2020-08-24 | Cavity filter and communication radio frequency equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112072232A true CN112072232A (en) | 2020-12-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010854158.0A Pending CN112072232A (en) | 2020-08-24 | 2020-08-24 | Cavity filter and communication radio frequency equipment |
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| Country | Link |
|---|---|
| CN (1) | CN112072232A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820091A (en) * | 2010-04-29 | 2010-09-01 | 网拓(上海)通信技术有限公司 | Adjustable cavity filter |
| CN103107389A (en) * | 2012-11-16 | 2013-05-15 | 深圳市大富科技股份有限公司 | Cavity filter |
| CN203134943U (en) * | 2012-11-16 | 2013-08-14 | 深圳市大富科技股份有限公司 | Cavity filter |
| CN204706616U (en) * | 2015-04-16 | 2015-10-14 | 深圳市大富科技股份有限公司 | Cavity body filter, duplexer and radio frequency remote equipment |
-
2020
- 2020-08-24 CN CN202010854158.0A patent/CN112072232A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820091A (en) * | 2010-04-29 | 2010-09-01 | 网拓(上海)通信技术有限公司 | Adjustable cavity filter |
| CN103107389A (en) * | 2012-11-16 | 2013-05-15 | 深圳市大富科技股份有限公司 | Cavity filter |
| CN203134943U (en) * | 2012-11-16 | 2013-08-14 | 深圳市大富科技股份有限公司 | Cavity filter |
| US20160233567A1 (en) * | 2012-11-16 | 2016-08-11 | Shenzhen Tatfook Technology Co., Ltd | Cavity filter and rf communication device with the cavity filter |
| CN204706616U (en) * | 2015-04-16 | 2015-10-14 | 深圳市大富科技股份有限公司 | Cavity body filter, duplexer and radio frequency remote equipment |
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Application publication date: 20201211 |