CN106252808A - A kind of radio frequency coaxial microband structure - Google Patents
A kind of radio frequency coaxial microband structure Download PDFInfo
- Publication number
- CN106252808A CN106252808A CN201610805315.2A CN201610805315A CN106252808A CN 106252808 A CN106252808 A CN 106252808A CN 201610805315 A CN201610805315 A CN 201610805315A CN 106252808 A CN106252808 A CN 106252808A
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- China
- Prior art keywords
- pcb board
- coaxial
- radio frequency
- transition structure
- connecting portion
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
- H01P3/06—Coaxial lines
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- Waveguide Connection Structure (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
Abstract
The invention discloses a kind of radio frequency coaxial microband structure, including coaxial outer conductor, coaxial inner conductor and pcb board, described pcb board is provided with microstrip line, it is additionally provided with transition structure on described pcb board, described transition structure includes the first connecting portion and the second connecting portion, described first connecting portion connects coaxial inner conductor, and described second connecting portion connects microstrip line.Do not use RF adapter, between coaxial inner conductor and microstrip line, set a transition structure, effectively reduce testing cost and processing procedure, can be used in electronics, substitute the RF cabling on pcb board, reduce the internal radio frequency interference of pcb board.
Description
Technical field
The present invention relates to radio frequency coaxial microband interconnection technique field, particularly relate to a kind of radio frequency coaxial microband structure.
Background technology
Radio frequency coaxial microband connector is simple to operate due to it, it is easy to safeguarding, superior electrical property, particularly in limited space
Occasion use the feature such as flexibly, be widely used in the fields such as optical communication equipment, measurement equipment, wireless device, radio-frequency module.Penetrate
Frequently coaxial microband connector plays the radio signal transmission effect of key, and it is the exclusive path connecting antenna with mainboard, so
Coaxial line has become the key factor of constraint radiofrequency signal quality, the quality of its radio frequency parameter with the standing-wave ratio of connected mode at mainboard
Meeting overlaying influence is to the sensitivity of antenna system, anti-in order to reduce the connection between different transmission line the most in actual applications
Penetrating, can use special adapter, it is relatively costly.
Summary of the invention
The technical problem to be solved is: provide a kind of radio-frequency (RF) coaxial not using radio frequency coaxial microband connector
Microstrip structure.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is: a kind of radio frequency coaxial microband structure, including
Coaxial outer conductor, coaxial inner conductor and pcb board, described pcb board is provided with microstrip line, described pcb board is additionally provided with transition structure,
Described transition structure includes the first connecting portion and the second connecting portion, and described first connecting portion connects coaxial inner conductor, described second
Connecting portion connects microstrip line.
Further, described transition structure is square.
Further, described transition structure is T-shaped.
Further, described coaxial inner conductor is welded on described first connecting portion.
Further, described coaxial outer conductor is welded on described pcb board.
Further, described pcb board is double-layer PCB board, and top layer and bottom copper thickness are 1Oz.
The beneficial effects of the present invention is: do not use RF adapter, between coaxial inner conductor and microstrip line, set a transition
Structure, effectively reduces testing cost and processing procedure, it is also possible in electronics, substitutes the RF cabling on pcb board, reduce
The internal radio frequency interference of pcb board.
Accompanying drawing explanation
Fig. 1 is radio frequency coaxial microband structural perspective of the present invention；
Fig. 2 is radio frequency coaxial microband structure top view 1 of the present invention；
Fig. 3 is the embodiment of the present invention one T-shaped transition structure S parameter return loss test result figure；
Fig. 4 is the embodiment of the present invention one T-shaped transition structure S parameter insertion loss test result figure；
Fig. 5 is the embodiment of the present invention one T-shaped transition structure standing-wave ratio VSWR performance diagram；
Fig. 6 is the embodiment of the present invention one T-shaped transition structure TDR Impedance performance diagram；
Fig. 7 is radio frequency coaxial microband structure top view 2 of the present invention；
Fig. 8 is the embodiment of the present invention two square transition structure standing-wave ratio VSWR performance diagram；
Fig. 9 is the embodiment of the present invention two square transition structure TDR Impedance performance diagram；
Label declaration:
1, coaxial feed；2, coaxial outer conductor；3, coaxial inner conductor；4, pcb board；5, microstrip line；6, transition structure；7,
A junction；8, the second connecting portion；9, RF adapter.
Detailed description of the invention
By describing the technology contents of the present invention in detail, being realized purpose and effect, below in conjunction with embodiment and coordinate attached
Figure is explained.
The design of most critical of the present invention is: sets a transition structure between coaxial inner conductor and microstrip line, does not use RF
Adapter, can effectively reduce testing cost and processing procedure.
Refer to Fig. 1, Fig. 2 and Fig. 7, a kind of radio frequency coaxial microband structure, including coaxial outer conductor, coaxial inner conductor and
Pcb board, described pcb board is provided with microstrip line, and described pcb board is additionally provided with transition structure, and described transition structure includes first even
Connecing portion and the second connecting portion, described first connecting portion connects coaxial inner conductor, and described second connecting portion connects microstrip line.
Knowable to foregoing description, the beneficial effects of the present invention is: do not use RF adapter, in coaxial inner conductor and micro-strip
Set a transition structure between line, can effectively reduce testing cost and processing procedure, it is also possible in electronics, substitute PCB
RF cabling on plate, reduces the internal radio frequency interference of pcb board.
Further, described transition structure is square.
Further, described transition structure is T-shaped.
Seen from the above description, transition structure may be designed as square or T-shaped, when transition structure is T-shaped, can increase
Holding wire and the compatibility of return path, effectively reduce the impedance of transitional region.
Further, described coaxial inner conductor is welded on described first connecting portion.
Seen from the above description, coaxial inner conductor can be directly welded in transition structure, it is not necessary to uses special connection
Device.
Further, described coaxial outer conductor is welded on described pcb board.
Further, described pcb board is double-layer PCB board, and top layer and bottom copper thickness are 1Oz.
Embodiment one
Refer to Fig. 1 to Fig. 6, embodiments of the invention one are: as it is shown in figure 1, a kind of radio frequency coaxial microband structure, including
Coaxial feed 1 and pcb board 4.As in figure 2 it is shown, described coaxial feed 1 includes coaxial outer conductor 2 and coaxial inner conductor 3, described PCB
Plate 4 is provided with microstrip line 5, and described pcb board 4 is additionally provided with transition structure 6, and described transition structure 6 includes the first connecting portion 7 and
Two connecting portions 8, described first connecting portion 7 connects coaxial inner conductor 3, and described second connecting portion 8 connects microstrip line 5, microstrip line 5
The other end connects the male of RF adapter 9.Transition structure 6 described in the present embodiment is T-shaped, the small end head of T-type structure and micro-
Band wire 5 connects, and coaxial inner conductor 3 is directly welded on described first connecting portion 7, and coaxial outer conductor is directly welded at pcb board 4
On.The size of pcb board 4 is 8mm*8mm*0.6mm, and base material is common FR4, and dielectric constant is 4.2, and loss tangent angle is 0.016,
The copper thickness of top layer and bottom is 1Oz.The present embodiment is to complete 1 turn of microstrip line 5 of coaxial feed by double-layer PCB board 4 to arrive RF again
The transition of adapter 9 male.
In the present embodiment, the performance of this T-shaped transition structure is carried out dependence test, as it is shown on figure 3, be the present embodiment
S parameter return loss test result, it can be seen that when frequency range is 0-6GHz, S11 Yu S22 reach-17dB with
Under, there is preferable return loss.As shown in Figure 4, for the present embodiment insertion loss test result, S21 Yu S12 is all at-0.25 model
In enclosing, there is preferable insertion loss.As it is shown in figure 5, be standing-wave ratio VSWR characteristic curve, the maximum when 6GHz is
1.3203, it is far smaller than the specification Max VSWR 1.45@0-6GHz of RFcable, can be seen that this T-shaped mistake from standing-wave ratio characteristic
Cross reflection when significantly reducing coaxial access pcb board 4.It is illustrated in figure 6 TDR Impedance characteristic curve, coaxially
When feed 1 proceeds to pcb board 4, impedance when thinner coaxial inner conductor 3 is welded direct on the cabling pad of pcb board 4 is higher,
Increase transition structure 6, increase the compatibility of holding wire and return path, significantly reduce the impedance of transitional region so that it is
Stable below 50 ohm, in figure, the impedance of minimum point is the impedance at RF adapter 9, and its impedance operator is less is to avoid
, it meets the Property Specification of 50+/-5Ohm.In the present embodiment, the size of transition structure 6 is big by RF adapter 9 male
Little decision.
Embodiment two
Refer to Fig. 7 to Fig. 9, for embodiments of the invention two, embodiment two is with the difference of embodiment one, as
Shown in Fig. 7, in the present embodiment, transition structure 6 is square.Be illustrated in figure 8 the present embodiment standing-wave ratio VSWR characteristic curve, its
0-6GHz maximum is 1.70, slightly larger than the specification of set maximum 1.45, as shown in Figure 8, for TDR Impedance characteristic
Curve, it can be seen that impedance raises rapidly when transition from figure, impedance matching is good not as T-shaped transition structure.
Comparative example one and embodiment two, the impedance matching of T-shaped transition structure is than the impedance of square transition structure
Joining property is good, has more preferable actual application value.Its reason be the resistance value Z of transition junction be about √ L/C, L mainly by by
The diameter of coaxial inner conductor determines, it is impossible to change again；Transition point electric capacity C is by the holding wire of welding position and signal return path
The area that is parallel to each other determines, the nearest and parallel area is the biggest can be effectively increased electric capacity C for distance.Herein due to coaxial inner conductor
Diameter has just started bending part from GND farther out, so its L is relatively big, increases T-shaped transition structure and makes C be effectively increased, it is ensured that Z is at this
50 ohm of couplings at place.Square transition structure simply ensure that the impedance of 50 ohm inside pcb board of microstrip line, and does not examine
Consider to big inductance L can be produced with coaxial inner conductor when being connected, so square transition structure can produce the impedance bigger than 50 ohm, its
Impedance matching can be poor.
In sum, the present invention provide a kind of radio frequency coaxial microband structure, including coaxial outer conductor, coaxial inner conductor and
Pcb board, described pcb board is provided with microstrip line, and described pcb board is additionally provided with transition structure, and described transition structure includes first even
Connecing portion and the second connecting portion, described first connecting portion connects coaxial inner conductor, and described second connecting portion connects microstrip line.Do not use
RF adapter, sets a transition structure between coaxial inner conductor and microstrip line, effectively reduces testing cost and processing procedure, can be used on electricity
In sub-communication apparatus, substitute the RF cabling on pcb board, reduce the internal radio frequency interference of pcb board；The shape of transition structure can basis
Needs are designed, and when for T-shaped, its impedance matching is better than square transition structure.
The foregoing is only embodiments of the invention, not thereby limit the scope of the claims of the present invention, every utilize this
The equivalents that bright description and accompanying drawing content are made, or directly or indirectly it is used in relevant technical field, the most in like manner include
In the scope of patent protection of the present invention.
Claims (6)
1. a radio frequency coaxial microband structure, including coaxial outer conductor, coaxial inner conductor and pcb board, described pcb board is provided with micro-
Band wire, it is characterised in that be additionally provided with transition structure on described pcb board, described transition structure includes the first connecting portion and second even
Meeting portion, described first connecting portion connects coaxial inner conductor, and described second connecting portion connects microstrip line.
Radio frequency coaxial microband structure the most according to claim 1, it is characterised in that described transition structure is square.
Radio frequency coaxial microband structure the most according to claim 1, it is characterised in that described transition structure is T-shaped.
4. according to the radio frequency coaxial microband structure described in any one of claims 1 to 3, it is characterised in that described coaxial inner conductor
It is welded on described first connecting portion.
5. according to the radio frequency coaxial microband structure described in any one of claims 1 to 3, it is characterised in that described coaxial outer conductor
It is welded on described pcb board.
6. according to the radio frequency coaxial microband structure described in any one of claims 1 to 3, it is characterised in that described pcb board is double-deck
Pcb board, top layer and bottom copper thickness are 1Oz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610805315.2A CN106252808B (en) | 2016-09-06 | 2016-09-06 | Radio frequency coaxial microstrip structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610805315.2A CN106252808B (en) | 2016-09-06 | 2016-09-06 | Radio frequency coaxial microstrip structure |
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| Publication Number | Publication Date |
|---|---|
| CN106252808A true CN106252808A (en) | 2016-12-21 |
| CN106252808B CN106252808B (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610805315.2A Active CN106252808B (en) | 2016-09-06 | 2016-09-06 | Radio frequency coaxial microstrip structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953658A (en) * | 2017-01-20 | 2017-07-14 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | High integration AESA transmitting-receiving subassembly |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6100774A (en) * | 1998-07-31 | 2000-08-08 | Raytheon Company | High uniformity microstrip to modified-square-ax interconnect |
| CN206134902U (en) * | 2016-09-06 | 2017-04-26 | 深圳市信维通信股份有限公司 | Coaxial microstrip structure of radio frequency |
-
2016
- 2016-09-06 CN CN201610805315.2A patent/CN106252808B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6100774A (en) * | 1998-07-31 | 2000-08-08 | Raytheon Company | High uniformity microstrip to modified-square-ax interconnect |
| CN206134902U (en) * | 2016-09-06 | 2017-04-26 | 深圳市信维通信股份有限公司 | Coaxial microstrip structure of radio frequency |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953658A (en) * | 2017-01-20 | 2017-07-14 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | High integration AESA transmitting-receiving subassembly |
| CN106953658B (en) * | 2017-01-20 | 2019-05-07 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | High integration active phased array transmitting-receiving subassembly |
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| Publication number | Publication date |
|---|---|
| CN106252808B (en) | 2022-05-27 |
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