CN108987867A - A kind of ultra wide band coaxial line-equivalent strip line plane transition structure - Google Patents
A kind of ultra wide band coaxial line-equivalent strip line plane transition structure Download PDFInfo
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- CN108987867A CN108987867A CN201810874256.3A CN201810874256A CN108987867A CN 108987867 A CN108987867 A CN 108987867A CN 201810874256 A CN201810874256 A CN 201810874256A CN 108987867 A CN108987867 A CN 108987867A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
- H01P5/085—Coaxial-line/strip-line transitions
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Abstract
The invention discloses a kind of ultra wide band coaxial line-equivalent strip line plane transition structures, belong to microwave regime more particularly to mobile communication field.Transition structure of the invention is applied to the electromagnetic transmission of coaxial line to equivalent strip line, which forms by semi-open metal cavity and positioned at the intracorporal top layer metallic layer of semi-open wire chamber, medium base, bottom metal layer and plated-through hole.Medium base is between top layer metallic layer and bottom metal layer.Design structure of the present invention is simple, easy to process, and bandwidth of operation meets mobile communication frequency range, is able to achieve Circuit Matching excellent between coaxial line and equivalent strip-line circuit, and the return loss and circuit loss of the microwave device based on equivalent strip line is effectively reduced.
Description
Technical field
The present invention relates to a kind of ultra wide band coaxial line-equivalent strip line plane transition structures, belong to microwave technical field, especially
It is related to mobile communication field.
Background technique
Conventional band line transmission line is made of upper and lower two layers of earth plate and a thin conductor band.In practical engineering applications,
Especially in base station antenna feeder network, metal shell and metal cover that upper and lower two layers of earth plate is fabricated to by die-casting process
Plate realizes that thin conductor band is made by metal band.To guarantee that electromagnetic wave is propagated according to strip transmission theory, metal
Band is needed by increasing additional assisted plastic part, to guarantee that metal band is located at the cavity being made of metal shell and cover board
It is intermediate.In recent years, new strip line component scheme has been used: by printed circuit board in base station antenna feeder network
Inner conductor circuit instead of original metal band, the cavity being made by profile molding is instead of die cast metal cavity.Cause
Higher for frequency locating for mobile communication, the skin effect of electromagnetic wave is obvious, and current convergence is in conductive surface, so by printing electricity
The electromagnetic transmission characteristic that road plate and cavity of sectional material form equivalent strip-line circuit is just similar to conventional band line circuit, by equivalent
The component that strip-line circuit is fabricated to can be referring to conventional band line circuit design method.
In recent years, equivalent band has been utilized in patent CN 104051821A, 10606757 A of 104681896 CN A and CN
Shape line designs some microwave devices, but in these microwave devices, the transition structure existing defects of coaxial line and component,
Amplitude, the phase of upper and lower conductive surface electric current are not consistent enough, cause the band bandwidth of the transition structure efficient operation insufficient,
In frequency 2.19-2.69GHz, standing wave is higher than 1.2 or more, is unfavorable for coaxial line and the component realization based on equivalent strip line is good
Good Circuit Matching, increases circuit loss.
Summary of the invention
The present invention is directed to technical problem of the existing technology, provides a kind of plane of equivalent microstrip circuitry of coaxial line-
Transition structure, coaxial line can realize good Circuit Matching with equivalent strip-line circuit in mobile communication frequency range.
In order to solve the above technical problems, the present invention adopts the following technical scheme that: a kind of ultra wide band coaxial line-equivalent strip line
Plane transition structure, by top layer metallic layer, medium base, bottom metal layer, plated-through hole and semi open model metal cavity
Composition；Top layer metallic layer, medium base, bottom metal layer and plated-through hole are located at the metal cavity of the semi open model
It is interior；The medium base is between the top layer metallic layer and the bottom metal layer；The plated-through hole
For connecting top layer metallic layer and bottom metal layer, current lead-through is realized.
Further, the transition structure includes multiple rows of plated-through hole.
Further, the transition structure includes two rows of plated-through holes, and two rows of plated-through holes are located at transition structure
Both sides are arranged in close to metal layer edge.
Further, in every row's plated-through hole, the diameter d and adjacent metal through-hole distance s of plated-through hole meet s
≤2*d；Plated-through hole quantity n and metal layer length L meet n*s≤L.
Further, the top layer metallic layer edges cover green oil, plated-through hole are arranged within the scope of green oil.
Further, the transition structure is located in metal cavity, the upper inner wall of top layer metallic layer and metal cavity
Vertical range and bottom metal layer are identical as the vertical range of lower inner wall of metal cavity.
Further, the metal cavity of the semi open model opens up the circular hole for coaxial line insertion, circular hole hole in its side wall
Diameter is slightly larger than the diameter of coaxial line dielectric layer；Coaxial outer conductor is welded with metal cavity；The top side of the metal cavity
Open rectangular opening；Coaxial inner conductor and the top layer metallic layer of transition structure weld.
Further, the width of the rectangular opening need to be greater than the width of top layer metallic layer, and the length of rectangular opening is slightly larger than top
The length of layer metal layer, one side of rectangular opening flushes in vertical direction with medium base.
Further, coaxial inner conductor is connect with top layer metallic layer by welding manner using 50 ohm coaxial lines.
Further, equivalent strip-line circuit is connect by transition structure with coaxial line；Equivalent strip-line circuit includes gold
Belong to cavity, upper dielectric layer, top layer metallic layer, medium base, bottom metal layer, lower dielectric layer and plated-through hole；Upper and lower medium
Layer is located among metal cavity inner wall and top, bottom metal layer；The top layer metallic layer of equivalent strip line, medium base,
The top layer metallic layer of bottom metal layer, plated-through hole and metal cavity and transition structure, medium base, bottom metal layer, gold
Categoryization through-hole and metal cavity are respectively positioned on same level, and propagation properties are similar.
Beneficial effects of the present invention: design structure of the present invention is simple, easy to process, and bandwidth of operation meets mobile communication frequency
The microwave member based on equivalent strip line is effectively reduced so that realizing matched well between coaxial line and equivalent strip-line circuit in section
The return loss and circuit loss of device.
Detailed description of the invention
It, below will be to needed in the embodiment in order to more clearly illustrate the technical solution in the embodiment of the present invention
Attached drawing is simply introduced, it should be apparent that, the accompanying drawings in the following description is only some embodiments recorded in the present invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the structural schematic diagram of the equivalent strip line plane transition structure of coaxial line-of the invention part in the cavity.
Fig. 2 is the whole birds-eye perspective of the equivalent strip line plane transition structure of coaxial line-of the invention.
Fig. 3 is the overall structure perspective view of the equivalent strip line plane transition structure of coaxial line-of the invention.
Fig. 4 is that the connection structure of plane transition structure of the invention and equivalent strip-line circuit part in the cavity is illustrated
Figure.
Fig. 5 is that the standing wave of plane transition structure and existing transition structure of the invention compares.
Specific embodiment
Technical solution of the present invention will be clearly and completely described by specific embodiment below.
As shown in Figure 1, being a kind of ultra wide band coaxial line of the invention-equivalent strip line plane transition structure, the excessive knot
Structure A is located in semi-open metal cavity, including top layer metallic layer 1, medium base 2, bottom metal layer 3, two sides metallization are logical
Hole 4 and semi open model metal cavity 5；Top layer metallic layer 1, medium base 2, bottom metal layer 3 and plated-through hole 4 are located at half-open
It puts in the metal cavity 5 of formula；Medium base 2 is between top layer metallic layer 1 and bottom metal layer 3；The setting of plated-through hole 4 two
Row, is located at the both sides of the transition structure, and each plated-through hole is all connected with top layer metallic layer 1 and bottom metal layer 3, realizes
Current lead-through.The top layer metallic layer and bottom metal layer of the transition structure vertical range with the upper and lower inner wall of metal cavity respectively
It is identical.
Fig. 2 and Fig. 3 shows the plane transition structure of the equivalent strip-line circuit of coaxial line-of the present invention in practical application
Overall schematic.The side wall of semi open model metal cavity opens up the circular hole for 50 ohm coaxial line B insertion, and circular hole aperture is slightly larger than
The diameter of coaxial line dielectric layer；50 ohm coaxial line outer conductors are welded with metal cavity；The top of inner conductor and transition structure
Layer metal layer welding；Wherein top layer metallic layer edges cover green oil, plated-through hole is within the scope of green oil, to prevent scolding tin from passing through
Plated-through hole flow to bottom metal layer.Rectangular opening 8 is opened in the top side of metal cavity, welds convenient for coaxial inner conductor and top-level metallic
It connects；The width of rectangular opening need to be greater than the width of top layer metallic layer, and the length of rectangular opening is slightly larger than the length of top layer metallic layer, square
The one side in shape hole flushes in vertical direction with medium base.Equivalent strip-line circuit C includes metal cavity 5, upper dielectric layer 6,
Top layer metallic layer 1, medium base 2, bottom metal layer 3, lower dielectric layer 7 and plated-through hole 4；Upper and lower dielectric layer is located at
Among metal cavity inner wall and top, bottom metal layer as shown in figure 4, the top layer metallic layer of equivalent strip line, medium base,
The top layer metallic layer of bottom metal layer, plated-through hole and metal cavity and transition structure, medium base, bottom metal layer, gold
Categoryization through-hole and metal cavity are respectively positioned on same level, and propagation properties are similar.
The shape that transition structure is chosen in Fig. 2 is rectangle, and L is the length of rectangular transition structure, and W is rectangular transition structure
Width, d are the diameter of metallization VIA, and s is the spacing of adjacent metal via hole, and m is the spacing of two rows of plated-through holes.In order to open up
Show performance of the invention, equivalent strip-line circuit has chosen such as equivalent strip transmission line circuit most basic in Fig. 3, to avoid because etc.
Effect strip-line circuit matching is bad to cause inventive inaccurate, the wherein impedance of coaxial line and equivalent strip transmission line circuit
It is 50 ohm.The attachment structure schematic diagram before transition structure of the present invention and equivalent strip-line circuit is illustrated in Fig. 4.
In the transition structure of Fig. 2, after plated-through hole, electromagnetic wave can be transferred to first from top layer metallic layer
Bottom metal layer, the electric field strength that such structure allows for electromagnetic wave at two is more symmetrical, the intrinsic impedance ratio of transition structure
More stable, avoiding in document because upper and lower electric field strength is variant causes transition structure performance bad.In order to guarantee the present invention
The parameter in transition structure is optimized in the excellent properties of transition structure, in which:
1. the width W of metal layer determines the impedance value of the transition structure in transition structure, and the length L of metal layer is substantially to resistance
Anti- value influence substantially useless；
2. in every row's plated-through hole, the diameter d and adjacent metal through-hole distance s of plated-through hole meet s≤2*d, metal
When change number of openings n and metal layer length L meets n*s≤L, the impedance value of transition structure is more stable, will not be because of metal layer
Length L is different and is affected；
3. two rows of plated-through hole spacing m are the smaller the better, but it influences very little to impedance value, so in practical applications, it is two rows of
Plated-through hole can be arranged in close to metal layer edge and cover at this green oil, and excessive tin flow to bottom when to avoid welding
Layer metal layer simultaneously leads to short circuit.
After parameter optimization, the relatively dominance energy of transition structure of the present invention in Fig. 5 can be obtained, in frequency range 0.7-2.7GHz
In, the standing wave of circuit shown in Fig. 3 is respectively less than 1.16.Also it is optimized compared with dominance energy that transition structure is illustrated in Fig. 5 simultaneously,
In frequency range 0.7-2.7GHz, standing wave highest 1.41.Pass through comparison, it is possible to find transition structure of the invention can be realized effectively together
For axis to the Circuit Matching between equivalent strip-line circuit, the frequency range of efficient operation can meet mobile communication need at this stage very well
It asks.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to design of the invention
It is defined with range, without departing from the design concept of the invention, ordinary engineering and technical personnel is to this hair in this field
The all variations and modifications that bright technical solution is made should all fall into protection scope of the present invention, claimed skill of the invention
Art content is all documented in technical requirements book.
Claims (10)
1. a kind of ultra wide band coaxial line-equivalent strip line plane transition structure, it is characterised in that: by top layer metallic layer, medium base
Layer, bottom metal layer, plated-through hole and semi open model metal cavity composition；Top layer metallic layer, medium base, underlying metal
Layer and plated-through hole are located in the metal cavity of the semi open model；The medium base is located at the top-level metallic
Between layer and the bottom metal layer；The plated-through hole is realized for connecting top layer metallic layer and bottom metal layer
Current lead-through.
2. a kind of ultra wide band coaxial line according to claim 1-equivalent strip line plane transition structure, it is characterised in that:
The transition structure includes multiple rows of plated-through hole.
3. a kind of ultra wide band coaxial line according to claim 2-equivalent strip line plane transition structure, it is characterised in that:
The transition structure includes two rows of plated-through holes, and two rows of plated-through holes are located at the both sides of transition structure, is arranged in close to gold
Belong to layer edge.
4. a kind of ultra wide band coaxial line according to claim 2-equivalent strip line plane transition structure, it is characterised in that:
In every row's plated-through hole, the diameter d and adjacent metal through-hole distance s of plated-through hole meet s≤2*d；Plated-through hole
Quantity n and metal layer length L meet n*s≤L.
5. a kind of ultra wide band coaxial line according to claim 1-equivalent strip line plane transition structure, it is characterised in that:
The top layer metallic layer edges cover green oil, plated-through hole are arranged within the scope of green oil.
6. a kind of ultra wide band coaxial line according to claim 1-equivalent strip line plane transition structure, it is characterised in that:
The transition structure is located in metal cavity, the vertical range and underlying metal of the upper inner wall of top layer metallic layer and metal cavity
Layer is identical as the vertical range of lower inner wall of metal cavity.
7. a kind of ultra wide band coaxial line according to claim 1-equivalent strip line plane transition structure, it is characterised in that:
The metal cavity of the semi open model opens up the circular hole for coaxial line insertion in its side wall, and circular hole aperture is slightly larger than coaxial line medium
The diameter of layer；Coaxial outer conductor is welded with metal cavity；Open rectangular opening in the top side of the metal cavity；It is led in coaxial line
Body and the top layer metallic layer of transition structure weld.
8. a kind of ultra wide band coaxial line according to claim 7-equivalent strip line plane transition structure, it is characterised in that:
The width of the rectangular opening need to be greater than the width of top layer metallic layer, and the length of rectangular opening is slightly larger than the length of top layer metallic layer,
One side of rectangular opening flushes in vertical direction with medium base.
9. a kind of ultra wide band coaxial line according to claim 7-equivalent strip line plane transition structure, it is characterised in that:
Coaxial inner conductor is connect with top layer metallic layer by welding manner using 50 ohm coaxial lines.
10. a kind of ultra wide band coaxial line according to claim 1-equivalent strip line plane transition structure, it is characterised in that:
Equivalent strip-line circuit is connect by transition structure with coaxial line；Equivalent strip-line circuit includes metal cavity, upper dielectric layer, top
Layer metal layer, medium base, bottom metal layer, lower dielectric layer and plated-through hole；Upper and lower dielectric layer is located at metal cavity
Among inner wall and top, bottom metal layer；The top layer metallic layer of equivalent strip line, medium base, bottom metal layer, metallization are logical
The top layer metallic layer of hole and metal cavity and transition structure, medium base, bottom metal layer, plated-through hole and metal cavity are equal
It is located on the same floor face, and propagation properties are similar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810874256.3A CN108987867B (en) | 2018-08-03 | 2018-08-03 | Ultra-wideband coaxial line-equivalent stripline plane transition structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810874256.3A CN108987867B (en) | 2018-08-03 | 2018-08-03 | Ultra-wideband coaxial line-equivalent stripline plane transition structure |
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| Publication Number | Publication Date |
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| CN108987867A true CN108987867A (en) | 2018-12-11 |
| CN108987867B CN108987867B (en) | 2021-03-09 |
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| CN201810874256.3A Active CN108987867B (en) | 2018-08-03 | 2018-08-03 | Ultra-wideband coaxial line-equivalent stripline plane transition structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115425380A (en) * | 2022-08-10 | 2022-12-02 | 天津大学 | Broadband transition structure of dielectric integrated suspended parallel strip line to back-to-ground coplanar waveguide |
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| PL157285B1 (en) * | 1988-02-18 | 1992-05-29 | Przemyslowy Inst Telekomun | Connection between coaxial transmission line and overhead symmetric transmission line |
| CN106410402A (en) * | 2015-08-03 | 2017-02-15 | 日立金属株式会社 | Antenna device |
| CN107275735A (en) * | 2017-06-14 | 2017-10-20 | 电子科技大学 | A kind of new coaxial microband converter |
| EP3249741A1 (en) * | 2016-05-24 | 2017-11-29 | Alcatel-Lucent Shanghai Bell Co., Ltd. | Device for the connection between a strip line and a coaxial cable |
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2018
- 2018-08-03 CN CN201810874256.3A patent/CN108987867B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL157285B1 (en) * | 1988-02-18 | 1992-05-29 | Przemyslowy Inst Telekomun | Connection between coaxial transmission line and overhead symmetric transmission line |
| CN106410402A (en) * | 2015-08-03 | 2017-02-15 | 日立金属株式会社 | Antenna device |
| EP3249741A1 (en) * | 2016-05-24 | 2017-11-29 | Alcatel-Lucent Shanghai Bell Co., Ltd. | Device for the connection between a strip line and a coaxial cable |
| CN107275735A (en) * | 2017-06-14 | 2017-10-20 | 电子科技大学 | A kind of new coaxial microband converter |
Non-Patent Citations (2)
| Title |
|---|
| YIFANG WANG 等: ""Orthogonal Coaxial to Suspended Substrate Transition for K Band Operation"", 《2018 AUSTRALIAN MICROWAVE SYMPOSIUM (AMS)》 * |
| 俞彬: ""新型平面带通滤波器及混合Q值技术研究"", 《中国博士学位论文全文数据库 信息科技辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115425380A (en) * | 2022-08-10 | 2022-12-02 | 天津大学 | Broadband transition structure of dielectric integrated suspended parallel strip line to back-to-ground coplanar waveguide |
| CN115425380B (en) * | 2022-08-10 | 2023-06-16 | 天津大学 | Broadband transition structure of dielectric integrated suspension parallel strip line-back ground coplanar waveguide |
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| CN108987867B (en) | 2021-03-09 |
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Effective date of registration: 20191111 Address after: 226463 Zhongtian Industrial Zone, Hekou Town, Rudong County, Jiangsu, Nantong Applicant after: ZHONGTIAN BROADBAND TECHNOLOGY Co.,Ltd. Applicant after: Zhongtian Communication Technology Co.,Ltd. Address before: 226463 Zhongtian Industrial Zone, Hekou Town, Rudong County, Jiangsu, Nantong Applicant before: ZHONGTIAN BROADBAND TECHNOLOGY Co.,Ltd. |
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Denomination of invention: An ultra wideband coaxial equivalent stripline planar transition structure Effective date of registration: 20221010 Granted publication date: 20210309 Pledgee: Rudong sub branch of Bank of China Ltd. Pledgor: ZHONGTIAN BROADBAND TECHNOLOGY Co.,Ltd. Registration number: Y2022980017823 |