CN107946714B - Planar balun - Google Patents
Planar balun Download PDFInfo
- Publication number
- CN107946714B CN107946714B CN201711378906.7A CN201711378906A CN107946714B CN 107946714 B CN107946714 B CN 107946714B CN 201711378906 A CN201711378906 A CN 201711378906A CN 107946714 B CN107946714 B CN 107946714B
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- transmission line
- transmission
- dielectric substrate
- feed port
- coaxial
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- 230000005540 biological transmission Effects 0.000 claims abstract description 131
- 239000000758 substrate Substances 0.000 claims abstract description 30
- 239000002184 metal Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Classifications
-
- 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
- H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Coils Or Transformers For Communication (AREA)
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Abstract
The invention discloses a planar balun, which comprises a coaxial feed port and a dielectric substrate provided with a first transmission line and a second transmission line; the first transmission line and the second transmission line comprise two transmission sections and a metallized via hole, and the metallized via hole penetrates through the dielectric substrate and is used for connecting the two transmission sections positioned on different surfaces of the dielectric substrate; the coaxial feed port passes through the dielectric substrate, and the coaxial outer input end of the coaxial feed port is connected with one transmission section of the first transmission line, and the coaxial inner input end of the coaxial feed port is connected with one transmission section of the second transmission line, so that output currents between the two transmission sections of the first transmission line and the second transmission line are respectively in phase. Therefore, the invention not only reduces the profile height, but also realizes the conversion from unbalance to balance by utilizing two mutually parallel transmission lines, thereby avoiding current reflection.
Description
Technical Field
The invention relates to a planar balun, in particular to a planar balun for realizing unbalanced-to-balanced conversion by using parallel transmission lines.
Background
At present, the conventional balun applied to low frequency is matched by adopting a magnetic core and coaxial line mode, so that the section height is high, and the balun is difficult to apply to a miniaturized low frequency antenna.
Disclosure of Invention
The invention aims at: provided is a planar balun which can be applied to a miniaturized low-frequency antenna.
In order to achieve the above object, the present invention provides the following technical solutions:
a planar balun comprising a coaxial feed port and a dielectric substrate provided with a first transmission line and a second transmission line; wherein,,
the first transmission line and the second transmission line comprise two transmission sections and a metallized via hole, and the metallized via hole penetrates through the dielectric substrate and is used for connecting the two transmission sections positioned on different surfaces of the dielectric substrate;
the coaxial feed port passes through the dielectric substrate, the coaxial outer input end of the coaxial feed port is connected with one transmission section of the first transmission line, and the coaxial inner input end of the coaxial feed port is connected with one transmission section of the second transmission line, so that output currents between the two transmission sections of the first transmission line and the second transmission line are respectively in phase.
According to a specific embodiment, in the planar balun of the present invention, the two transmission sections of the first transmission line and the second transmission line are metal layers with uniform thickness covered on the dielectric substrate.
Further, the transmission sections of the first transmission line and the second transmission line have a smaller cross-sectional width of the metal layer thereof for transmitting a current in the direction of current output.
According to a specific embodiment, in the planar balun of the present invention, the parameters of the first transmission line and the second transmission line are identical.
According to a specific embodiment, in the planar balun of the present invention, the dielectric substrate has a dielectric constant in a range of 3±0.04.
According to a specific embodiment, in the planar balun of the present invention, for convenience of installation, the dielectric substrate has a mounting portion extending along a plate surface.
Compared with the prior art, the invention has the beneficial effects that:
1. in the planar balun, the first transmission line and the second transmission line which are parallel to each other are arranged on the dielectric substrate, so that the section height is reduced, and the two transmission lines which are parallel to each other are utilized to realize the conversion from unbalance to balance, so that the current reflection is avoided.
2. In the planar balun, the transmission sections of the first transmission line and the second transmission line are metal layers with uniform thickness covered on the dielectric substrate, and the section width of each transmission section for transmitting current of the metal layers along the current output direction is reduced, so that the matching from low impedance to high impedance is realized.
3. In the planar balun, parameters of the first transmission line and parameters of the second transmission line are consistent, and constant-amplitude power transmission of the antenna is realized.
Description of the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
The marks in the figure: the coaxial cable comprises a coaxial outer input end of a 1-coaxial feed port, a coaxial inner input end of a 2-coaxial feed port, a 3-mounting part, a 4-first groove, a 5-second groove, a 101-first transmission section of a first transmission line, a 102-metalized via of the first transmission line, a 103-second transmission section of the first transmission line, a 201-first transmission section of the second transmission line, a 202-metalized via of the second transmission line and a 203-second transmission section of the second transmission line.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
The planar balun of the present invention includes a coaxial feed port and a dielectric substrate provided with a first transmission line and a second transmission line.
The first transmission line and the second transmission line comprise two transmission sections and a metallized via hole, and the metallized via hole penetrates through the dielectric substrate and is used for connecting the two transmission sections located on different surfaces of the dielectric substrate.
The coaxial feed port passes through the dielectric substrate, the coaxial outer input end of the coaxial feed port is connected with one transmission section of the first transmission line, and the coaxial inner input end of the coaxial feed port is connected with one transmission section of the second transmission line, so that output currents between the two transmission sections of the first transmission line and the second transmission line are respectively in phase.
In implementation, the planar balun is manufactured by a PCB manufacturing process, the dielectric substrate is made of RO3003, the dielectric constant is 3, and other materials with dielectric constants within the range of 3+/-0.04 can be selected. And the two transmission sections of the first transmission line and the second transmission line are metal layers with uniform thickness covered on the dielectric substrate.
Moreover, in order to achieve low-to-high impedance matching, in the first and second transmission lines, each transmission segment has a smaller cross-sectional width of its metal layer transmitting current in the direction of its current output, i.e., the impedance is higher and higher.
Meanwhile, in order to realize the constant-amplitude power transmission of the antenna, the parameters of two mutually parallel transmission lines in the plane balun are consistent.
A schematic structural diagram of one embodiment of the present invention shown in connection with fig. 1; the planar balun of the invention has a front surface A and a back surface B, and the coaxial feed port penetrates through the dielectric substrate.
On the front side a, the first transmission section 101 of the first transmission line is connected to the coaxial outer input 2 of the coaxial feed port, and the first transmission section 101 of the first transmission line is connected to the second transmission section 103 of the first transmission line of the rear side B by means of a metallized via 102. Meanwhile, on the front face a, the first transmission section 101 of the first transmission line is isolated from the second transmission section 202 of the second transmission line by the first trench 4.
On the back side B the first transmission section 201 of the second transmission line is connected to the inner input of the coaxial feed port and the first transmission section 201 of the second transmission line is connected to the second transmission section 203 of the second transmission line of the front side a by means of a metallized via 202. On the front side B, the first transmission section 201 of the second transmission line is isolated from the second transmission section 202 of the first transmission line by the second trench 5.
Further, the coaxial feed port is located on a cross-sectional line where the cross-sectional width of the metal layer transmitting the current is largest in the current output direction of the first transmission section 101 of the first transmission line and the first transmission section 201 of the second transmission line, and the center of the coaxial feed port coincides with the midpoint of the cross-sectional line. In order to make the size smaller, the shape of the dielectric substrate is consistent with the outline of the first transmission line and the second transmission line, and in order to facilitate installation, the dielectric substrate is provided with an installation part 3 extending along the board surface, and the installation part 3 of the dielectric substrate is fixed to fix the whole planar balun at the installation position of the miniaturized low-frequency antenna.
In this embodiment, for the purpose of minimizing the size, the first trench 4 and the second trench 5 are preferably in a vertical dogleg shape, and of course, if the size requirement allows, the first trench 4 and the second trench 5 may be in a straight line shape, that is, the first trench 4 and the second trench 5 cross between the metallized via 102 and the metallized via 202, respectively.
Claims (6)
1. The planar balun is characterized by comprising a coaxial feed port and a dielectric substrate provided with a first transmission line and a second transmission line; wherein,,
the first transmission line and the second transmission line comprise two transmission sections and a metallized via hole, and the metallized via hole penetrates through the dielectric substrate and is used for connecting the two transmission sections positioned on different surfaces of the dielectric substrate;
the coaxial feed port passes through the medium substrate, the coaxial outer input end of the coaxial feed port is connected with one transmission section of the first transmission line, the coaxial inner input end of the coaxial feed port is connected with one transmission section of the second transmission line, and the output currents between the two transmission sections of the first transmission line and the second transmission line are respectively in phase; on the A face, a first transmission section of the first transmission line is isolated from a second transmission section (202) of the second transmission line by a first groove; on the B-side, the first transmission section of the second transmission line is isolated from the second transmission section of the first transmission line by a second trench.
2. The planar balun of claim 1, wherein the two transmission segments of the first transmission line and the second transmission line are metal layers of uniform thickness overlying the dielectric substrate.
3. The planar balun of claim 2, wherein the two transmission segments of the first transmission line and the second transmission line have a reduced width of their metal layers in the direction of current output.
4. A planar balun according to any one of claims 1 to 3 wherein the parameters of the first transmission line and the second transmission line are identical.
5. A planar balun according to any one of claims 1 to 3 wherein the dielectric substrate has a dielectric constant in the range 3±0.04.
6. A planar balun according to any one of claims 1 to 3 wherein the dielectric substrate has a mounting portion extending along the face of the plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711378906.7A CN107946714B (en) | 2017-12-19 | 2017-12-19 | Planar balun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711378906.7A CN107946714B (en) | 2017-12-19 | 2017-12-19 | Planar balun |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107946714A CN107946714A (en) | 2018-04-20 |
| CN107946714B true CN107946714B (en) | 2023-07-04 |
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ID=61940863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711378906.7A Active CN107946714B (en) | 2017-12-19 | 2017-12-19 | Planar balun |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107946714B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002190413A (en) * | 2000-12-22 | 2002-07-05 | Kyocera Corp | Laminated balun transformer |
| EP1758200A2 (en) * | 2005-08-23 | 2007-02-28 | Synergy Microwave Corproation | Multilayer planar balun transformer, mixers and amplifiers |
| EP3110003A2 (en) * | 2015-06-26 | 2016-12-28 | Acco | Multimode operation for differential power amplifiers |
| CN207587946U (en) * | 2017-12-19 | 2018-07-06 | 成都芯通软件有限公司 | A kind of planar Balun |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7692511B2 (en) * | 2008-03-21 | 2010-04-06 | Sychip Inc. | Compact balun transformers |
| EP2629106B8 (en) * | 2012-02-20 | 2018-10-17 | Rohde & Schwarz GmbH & Co. KG | Measurement bridge in a printed circuit board |
-
2017
- 2017-12-19 CN CN201711378906.7A patent/CN107946714B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002190413A (en) * | 2000-12-22 | 2002-07-05 | Kyocera Corp | Laminated balun transformer |
| EP1758200A2 (en) * | 2005-08-23 | 2007-02-28 | Synergy Microwave Corproation | Multilayer planar balun transformer, mixers and amplifiers |
| EP3110003A2 (en) * | 2015-06-26 | 2016-12-28 | Acco | Multimode operation for differential power amplifiers |
| CN207587946U (en) * | 2017-12-19 | 2018-07-06 | 成都芯通软件有限公司 | A kind of planar Balun |
Non-Patent Citations (1)
| Title |
|---|
| Design of a Planar Transmission Line Balun Based on Novel Phase Inverter;YA-QING YU et al.;《IEEE ACCESS》;20200621;第18915-18924页 * |
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| Publication number | Publication date |
|---|---|
| CN107946714A (en) | 2018-04-20 |
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