CN112290172A - Radio frequency coaxial connecting structure and filter - Google Patents
Radio frequency coaxial connecting structure and filter Download PDFInfo
- Publication number
- CN112290172A CN112290172A CN202011027500.6A CN202011027500A CN112290172A CN 112290172 A CN112290172 A CN 112290172A CN 202011027500 A CN202011027500 A CN 202011027500A CN 112290172 A CN112290172 A CN 112290172A
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- China
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- radio frequency
- inner conductor
- outer conductor
- conductor
- shielding ring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/04—Fixed joints
- H01P1/045—Coaxial joints
-
- 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
Abstract
The invention relates to the technical field of radio frequency connectors, in particular to a radio frequency coaxial connecting structure and a filter, which comprise: the shielding ring is grounded; the inner conductor is provided with a connecting part, and at least part of the inner conductor is inserted into the outer conductor and is electrically connected with the outer conductor through the connecting part. The invention provides a radio frequency coaxial connecting structure which is butt-jointed with two standing wave detection boards, is flexible and pluggable, is free from welding and can ensure impedance matching. The invention also provides a filter with the radio frequency coaxial connection structure.
Description
Technical Field
The invention relates to the technical field of radio frequency connectors, in particular to a radio frequency coaxial connecting structure and a filter.
Background
In the base station system, the standing wave detection board is used for detecting return loss of an antenna port and the connection state of the antenna port, and the performance states of equipment such as an antenna, a cavity filter, a power amplifier and the like.
And in cavity filter, when doing the standing wave and detecting the overall arrangement, can touch Antenna (ANT) interface and standing wave detection signal output interface and appear the condition not in the coplanar, interface height installation face difference is great promptly, leads to the standing wave detection board can't make a standing wave detection board, makes coupling module and output interface on the standing wave detection board need set up respectively on two standing wave detection boards, two standing wave detection boards because the reason of installation difference in height, consequently, need adopt to connect to inserting and the mode of detaining.
When the two standing wave detection plates are butted, radio frequency signals are connected at the same time, so that 50 omega impedance matching needs to be ensured; in the prior art, a radio frequency semi-flexible cable is generally adopted to carry out point-to-point welding, the welding mode is complex, soldering iron operation is required for assembly and disassembly, and the process is complex; in addition, in the transmission process, the radio frequency signal is easy to generate resonance and poor grounding.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that impedance mismatching still exists when two standing wave detection plates are butted in the prior art, and solve the complicated process of assembling and disassembling the movable soldering iron for welding, thereby providing the radio frequency coaxial connection structure and the filter which are flexibly pluggable, free from welding and capable of ensuring impedance matching.
In order to solve the above technical problem, the present invention provides a radio frequency coaxial connection structure, including: the shielding ring is grounded; the inner conductor is provided with a connecting part, and at least part of the inner conductor is inserted into the outer conductor and is electrically connected with the outer conductor through the connecting part.
Optionally, the connecting portion is disposed at one end of the inner conductor and abuts against an inner wall of the outer conductor.
Optionally, the inner conductor further includes a limiting portion, the limiting portion is disposed at one end of the inner conductor far away from the connecting portion, and the diameter of the limiting portion is larger than the inner diameter of the inner conductor.
Optionally, the inner conductor, the outer conductor, and the shielding ring are made of metal.
Optionally, a fixing member for fixing the outer conductor is disposed between the outer conductor and the shielding ring, and the fixing member is an insulating member.
Optionally, the diameter of the inner conductor is 1mm, the inner diameter of the outer conductor is 1.4mm, and the outer diameter is 2 mm.
Optionally, the inner diameter of the shielding ring is 4.6 mm.
The invention also provides a filter, which comprises a first plate body, a second plate body and the radio frequency coaxial connection structure, wherein the first plate body and the second plate body are butted through the radio frequency coaxial connection structure.
Optionally, a mounting hole is formed in the first plate body, and the inner conductor is inserted into the mounting hole and fixed therein; the second plate body is provided with a plurality of through holes for inserting the protruding parts on the shielding ring so as to connect the second plate body and the shielding ring.
Optionally, the shielding ring is bonded to the first plate body by a conductive adhesive.
The technical scheme of the invention has the following advantages:
1. the invention provides a radio frequency coaxial connection structure, which comprises: the shielding ring is grounded; the inner conductor is provided with a connecting part, and at least part of the inner conductor is inserted into the outer conductor and is electrically connected with the outer conductor through the connecting part.
According to the radio frequency coaxial connection structure, only the inner conductor needs to be inserted into the outer conductor, so that the connecting part on the inner conductor is electrically connected with the outer conductor, meanwhile, the shielding ring needs to be grounded, radio frequency signals are jointly transmitted through the mutual matching of the inner conductor, the connecting part, the outer conductor and the shielding ring, and 50-ohm impedance matching between the inner conductor and the outer conductor is guaranteed. Simultaneously, through this connection structure's butt joint, to inserting the mode, not only nimble plug, exempt from the welding, still be convenient for processing preparation and assembly and maintenance solve the loaded down with trivial details technology that the assembly moved the flatiron welding with dismantling, have the installation effectiveness height, with the simple advantage of process.
2. According to the radio frequency coaxial connecting structure provided by the invention, the inner conductor, the outer conductor and the shielding ring are all made of metal. The inner conductor, the outer conductor and the shielding ring which are made of metal materials ensure the stability of radio frequency indexes, and simultaneously reduce the loss of radio frequency signals in the transmission process, thereby ensuring the 50 omega impedance matching of the inner conductor and the outer conductor.
3. According to the radio frequency coaxial connection structure provided by the invention, the fixing piece for fixing the outer conductor is arranged between the outer conductor and the shielding ring, and the fixing piece is an insulating piece. The main effect is the position of fixed outer conductor, prevents at the in-process of inserting the inner conductor, and the outer conductor takes place to rock.
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 some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a radio frequency coaxial connection structure according to an embodiment of the present invention;
FIG. 2 is a bottom view of FIG. 1;
fig. 3 is a schematic structural view after a first plate body and a second plate body are added;
fig. 4 is a cross-sectional view of fig. 3.
1-a first plate body; 11-mounting holes; 2-an inner conductor; 21-a connecting part; 22-a limiting part; 3-a second plate body; 31-a through hole; 4-an outer conductor; 5-a shield ring; 51-a projection; 6-a fixing piece; 7-conductive adhesive.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 to 4, a radio frequency coaxial connection structure for realizing connection and transmission of radio frequency signals between a first board 1 and a second board 3 includes an outer conductor 4 and a shielding ring 5, which are coaxially disposed, and the shielding ring 5 is grounded; the inner conductor 2 is provided with a connecting part 21 on the inner conductor 2, and at least part of the inner conductor 2 is inserted into the outer conductor 4 and is electrically connected with the outer conductor 4 through the connecting part 21.
The radio frequency coaxial connecting structure is characterized in that an inner conductor 2 is inserted and connected to a first plate body 1, an outer conductor 4 and a shielding ring 5 are inserted and connected to a second plate body 3, and the first plate body 1 and the second plate body 3 are both standing wave detection plates; when carrying out the butt joint of first plate body 1 and second plate body 3, only need insert inner conductor 2 to outer conductor 4 in, make inner conductor 2 be connected with first plate body 1 electricity, connecting portion 21 on the inner conductor 2 is connected with outer conductor 4 electricity, need guarantee shielding ring 5 ground connection simultaneously, outer conductor 4 is connected with second plate body 3 electricity, can be through inner conductor 2 and outer conductor 4 with radio frequency signal by first plate body 1 transmission to second plate body 3 in, can also guarantee 50 omega impedance match between first plate body 1 and the second plate body 3 through mutually supporting of outer conductor 4 and shielding ring 5. Simultaneously, first plate body 1 and second plate body 3 carry out the mode of making a knot, inserting through this connection structure, but not only nimble plug, exempt from the welding, still be convenient for processing preparation and assembly and maintenance solve the assembly and dismantle the loaded down with trivial details technology that moves the flatiron welding, have the installation effectiveness height, and the simple advantage of process.
Referring to fig. 2 and 3, when the diameter of the inner conductor 2 is a round needle shape with a diameter of 1mm, it is satisfied that the inner diameter of the outer conductor 4 is 1.4mm and the outer diameter is 2mm under the air condition; the shield ring 5 is provided outside the outer conductor 4. The outer conductor 4 and the shielding ring 5 are both of annular structures, so that the outer conductor has an inner diameter and an outer diameter, the inner diameter of the shielding ring 5 needs to be larger than the outer diameter of the outer conductor 4, and meanwhile, the requirement of air condition is met, so that the inner diameter of the shielding ring 5 is 4.6 mm; the sizes of the inner conductor 2, the outer conductor 4 and the shielding ring 5 can be changed along with the change of the inner conductor 2 so as to adapt to two standing wave detection plates with different height differences. The specific size can be set according to the actual situation.
As shown in fig. 2 and fig. 3, the connecting portion 21 is disposed at one end of the inner conductor 2 and abuts against the inner wall of the outer conductor 4. Since the diameter of the inner conductor 2 is 1mm and the inner diameter of the outer conductor 4 is 1.4mm, there is a difference of 0.4mm, and at the same time, the radius of the connection part 21 can be calculated to be 0.2 mm. The connecting portion 21 is a protrusion formed on the outer wall of the inner conductor 2, and the protrusion is a smooth curved surface, so that the connecting portion can be conveniently inserted into the inner portion of the outer conductor 4, and is abutted against the outer conductor 4 to commonly propagate radio frequency signals. Specifically, in the insertion of the inner conductor 2 into the outer conductor 4, a positive tolerance may be set on the surface of the inner conductor 2 and a negative tolerance may be set on the inner wall of the outer conductor 4, thereby allowing the connection portion 21 on the inner conductor 2 to be smoothly inserted into the outer conductor 4 and ensuring the complete contact of the inner conductor 2 with the outer conductor 4.
Referring to fig. 1, the inner conductor 2 further includes a limiting portion 22, and the limiting portion 22 is disposed at an end of the inner conductor 2 away from the connecting portion 21. Meanwhile, the diameter of the continuous limiting part 22 is larger than the inner diameter of the inner conductor 2, so that the limiting part 22 is abutted against one end of the limiting part 22. In this embodiment, the diameter of the limiting portion 22 is equal to the outer diameter of the outer conductor 4, which ensures that the outer portion of the inner conductor 2 and the outer conductor 4 after connection is smooth and beautiful.
Further, the inner conductor 2 is an integrally formed part, is manufactured in a milling mode, and is integrally machined and formed to enable the rigidity of the inner conductor 2 to be better, so that the connection strength of the inner conductor 2 in use is guaranteed.
Alternatively, the connection portion 21 and the connection-limiting portion 22 of the inner conductor 2 may be formed separately, for example, by welding.
In this embodiment, the inner conductor 2, the outer conductor 4, and the shield ring 5 are made of metal; specifically. The inner conductor 2, the outer conductor 4 and the shielding ring 5 are all made of copper. The inner conductor 2, the outer conductor 4 and the shielding ring 5 made of copper ensure the stability of radio frequency indexes, and simultaneously reduce the loss of radio frequency signals in the transmission process, thereby ensuring the 50 omega impedance matching of the first plate body 1 and the second plate body 3.
Copper has high thermal and electrical conductivity, and has the advantages of easy processing, low cost, good ductility, diamagnetism, durability, etc. Meanwhile, the composite material has good extensibility, strong plasticity, good productivity, stable chemical property and no magnetism, can be recycled, and is a virtuous recyclable metal material. The method is mainly applied to the fields of electric power, light industry, mechanical manufacturing, building industry, national defense industry and the like.
As an alternative embodiment, the material of the inner conductor 2, the outer conductor 4 and the shield ring 5 may also be aluminum. Aluminum has the advantages of good ductility, diamagnetism, durability and the like.
Referring to fig. 2 and 4, since the shielding ring 5 and the outer conductor 4 are both made of copper material, which is soft, a fixing member 6 is required to be separately disposed between the outer conductor 4 and the shielding ring 5, and the fixing member 6 has a ring structure and mainly functions to fix the position of the outer conductor 4 and prevent the outer conductor 4 from shaking during the process of inserting the inner conductor 2. The fixing member 6 is an insulating member, and specifically, the fixing member 6 is made of polytetrafluoroethylene.
The polytetrafluoroethylene is a high molecular polymer prepared by polymerizing tetrafluoroethylene as a monomer, is white wax, has the advantages of translucency, heat resistance and cold resistance, and can be used for a long time in an environment of-180-260 ℃. Therefore, the fixing piece 6 is made of the material, so that the stability of the fixing piece 6 is ensured, and the stability of the radio frequency index transmission of the inner conductor 2 and the outer conductor 4 is also ensured; at the same time, the interference of the outside to the inner conductor 2 and the outer conductor 4 is also blocked.
Meanwhile, the invention also provides a filter, which comprises a first plate body 1, a second plate body 3 and the radio frequency coaxial connecting structure, wherein the first plate body 1 and the second plate body 3 are butted through the radio frequency coaxial connecting structure. The first board 1 and the second board 3 are standing wave detection boards disposed in the filter.
Referring to fig. 4, when the first board body 1 and the inner conductor 2 are connected, a mounting hole 11 is formed in the first board body 1, the region of the mounting hole 11 is a welding region of the inner conductor 2 and the first board body 1, the inner conductor 2 is inserted into the mounting hole 11 of the first board body 1, and the inner conductor is welded by using a surface mount technology, wherein the connection limiting portion 22 plays a role in limiting and stably fixing, and simultaneously, the size of the inner conductor 2 inserted into the mounting hole 11 of the first board body 1 can be limited.
Referring to fig. 4, when the second plate 3 and the shielding ring 5 are connected, four through holes 31 are formed in the second plate 3, the four through holes 31 surround a circular shape, the circular shape surrounded by the four through holes 31 is a welding area of the shielding ring 5, one end of the shielding ring 5 close to the second plate 3 is provided with four protrusions 51, the protrusions 51 are inserted into the through holes 31, so that the second plate 3 and the shielding ring 5 are connected, and the shielding ring 5 is welded on the second plate 3 by using a surface mount technology, so that the shielding ring 5 and the second plate 3 are connected.
Furthermore, the other end of the shielding ring 5 is bonded to the first plate body 1 through a conductive adhesive 7, the conductive adhesive 7 is made of a conductive material and is used for grounding the shielding ring 5, the conductive adhesive 7 is laid on the upper surface of the shielding ring 5, and the first plate body 1 is tightly connected to the shielding ring 5 through the conductive adhesive 7, so that the first plate body 1, the shielding ring 5 and the second plate body 3 are connected to the ground through the ground.
The common ground is the ground of the circuit, and the ground of the stable power supply is connected with the shell which can be a filter shell, so that a complete shielding system is formed, and the interference of external signals is reduced.
During manufacturing, the inner conductor 2 is firstly inserted into the mounting hole 11 of the first plate body 1 and welded in the mounting hole 11 of the first plate body 1 by using a surface-mount technology; then, the outer conductor 4 is welded to the second plate 3, the protruding portion 51 of the shield ring 5 is inserted into the through hole 31 and welded to the outer conductor 4 by using a surface mount technique, the shield ring 5 and the outer conductor 4 are coaxially arranged, and finally, the fixing member 6 is fitted between the shield ring 5 and the outer conductor 4, thereby completing the manufacturing of the connection structure. When the connecting structure is installed, the first board body 1 and the second board body 3 are held, a conductive adhesive 7 is laid on one end face, away from the second board body 3, of the shielding ring 5, the inner conductor 2 is inserted into the outer conductor 4, and therefore the installation of the connecting structure is completed, namely the impedance matching between the first board body 1 and the second board body 3 is completed.
The above examples are merely illustrative for clarity and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (10)
1. A radio frequency coaxial connection structure, comprising:
the shielding ring (5) and the outer conductor (4) can be coaxially sleeved in the shielding ring (5), and the shielding ring (5) is grounded;
the inner conductor (2) is provided with a connecting part (21) on the inner conductor (2), and at least part of the inner conductor (2) is inserted into the outer conductor (4) and is electrically connected with the outer conductor (4) through the connecting part (21).
2. The rf coaxial connection according to claim 1, characterized in that the connection portion (21) is provided at one end of the inner conductor (2) and abuts against an inner wall of the outer conductor (4).
3. The radio frequency coaxial connection structure according to claim 2, wherein the inner conductor (2) further comprises a limiting portion (22), the limiting portion (22) is disposed at an end of the inner conductor (2) far away from the connecting portion (21), and a diameter of the limiting portion (22) is larger than an inner diameter of the inner conductor (2).
4. A radio frequency coaxial connection according to any of claims 1-3, characterized in that the inner conductor (2) and the outer conductor (4), as well as the shielding ring (5), are all metal.
5. The radio frequency coaxial connection according to claim 4, wherein a fixing member (6) for fixing the outer conductor (4) is provided between the outer conductor (4) and the shield ring (5), the fixing member (6) being an insulator.
6. A radio frequency coaxial connection according to any of claims 1-5, characterized in that the inner conductor (2) has a diameter of 1mm, the outer conductor (4) has an inner diameter of 1.4mm and an outer diameter of 2 mm.
7. The radio frequency coaxial connection according to any one of claims 1 to 6, characterized in that the inner diameter of the shielding ring (5) is 4.6 mm.
8. A filter comprising a first board body (1) and a second board body (3), characterized by further comprising the rf coaxial connection according to any one of claims 1-7, wherein the first board body (1) and the second board body (3) are butted by the rf coaxial connection.
9. The filter according to claim 8, wherein the first board body (1) is provided with a mounting hole (11), and the inner conductor (2) is inserted into the mounting hole (11) and fixed;
the second plate body (3) is provided with a plurality of through holes (31) for inserting the protruding parts (51) on the shielding ring (5) so as to connect the second plate body (3) and the shielding ring (5).
10. A filter according to claim 9, characterised in that the shielding ring (5) is bonded to the first plate body (3) by means of a conductive glue (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011027500.6A CN112290172A (en) | 2020-09-25 | 2020-09-25 | Radio frequency coaxial connecting structure and filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011027500.6A CN112290172A (en) | 2020-09-25 | 2020-09-25 | Radio frequency coaxial connecting structure and filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112290172A true CN112290172A (en) | 2021-01-29 |
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ID=74421417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011027500.6A Pending CN112290172A (en) | 2020-09-25 | 2020-09-25 | Radio frequency coaxial connecting structure and filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112290172A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3184706A (en) * | 1962-09-27 | 1965-05-18 | Itt | Coaxial cable connector with internal crimping structure |
| US20110244720A1 (en) * | 2010-04-02 | 2011-10-06 | Peng Chang Lin | Rf connector |
| CN103094744A (en) * | 2013-01-21 | 2013-05-08 | 华为机器有限公司 | Radio frequency coaxial connector |
| CN205543170U (en) * | 2015-06-30 | 2016-08-31 | 上海华为技术有限公司 | Wave filter and radio frequency coaxial connector |
-
2020
- 2020-09-25 CN CN202011027500.6A patent/CN112290172A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3184706A (en) * | 1962-09-27 | 1965-05-18 | Itt | Coaxial cable connector with internal crimping structure |
| US20110244720A1 (en) * | 2010-04-02 | 2011-10-06 | Peng Chang Lin | Rf connector |
| CN103094744A (en) * | 2013-01-21 | 2013-05-08 | 华为机器有限公司 | Radio frequency coaxial connector |
| CN205543170U (en) * | 2015-06-30 | 2016-08-31 | 上海华为技术有限公司 | Wave filter and radio frequency coaxial connector |
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Application publication date: 20210129 |