CN107611583B - Coupled feed type right-hand circular polarized antenna - Google Patents
Coupled feed type right-hand circular polarized antenna Download PDFInfo
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- CN107611583B CN107611583B CN201710791889.3A CN201710791889A CN107611583B CN 107611583 B CN107611583 B CN 107611583B CN 201710791889 A CN201710791889 A CN 201710791889A CN 107611583 B CN107611583 B CN 107611583B
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- polarized antenna
- circularly polarized
- quarter wavelength
- wavelength converter
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Abstract
The invention relates to a coupled feed type right-hand circularly polarized antenna which comprises a metal slot, a quarter wavelength converter, a first coupling piece connected to one end of the quarter wavelength converter and a second coupling piece connected to the other end of the quarter wavelength converter, wherein the metal slot comprises two opposite upper slot walls and lower slot walls, the first coupling piece is coupled with the upper slot walls for feeding, and the second coupling piece is coupled with the lower slot walls for feeding. The metal outer frame is designed into the antenna radiation body, so that the problems of difficult realization of circular polarization, poor roundness of the directional diagram, low gain and low efficiency of the antenna in the machine body are solved, the right-hand circular polarization effect with high gain, high efficiency and good roundness of the directional diagram can be realized in the metal machine body and complex internal electronic environment, the required clearance is small, and the cost is low and the realization is easy.
Description
Technical Field
The invention relates to the field of right-hand circularly polarized antennas, in particular to a coupling feed type right-hand circularly polarized antenna.
Background
In the civil field, the power of a right-hand circularly polarized wave signal transmitted by communication between a GPS satellite and a ground positioning terminal is only about 160dBm, so that a GPS antenna on the high-precision positioning terminal is required to have better receiving capability. Early external GPS antenna has fine search star effect under the free space environment that does not have the interference, and along with consumer electronics development, terminal miniaturization and outward appearance metallization's trend has brought new challenges for the design of antenna, and built-in antenna needs great headroom in order to avoid peripheral metal parts and metal casing, but actually hardly satisfies, and the performance is influenced by organism material and inside electron environment greatly. For GPS positioning antennas, metallized fuselages and complex internal electronics can cause distortion of the antenna pattern and degradation of gain, ultimately resulting in loss of the positioning signal.
Disclosure of Invention
In order to solve the technical problems, the invention provides a coupling feed type right-hand circular polarized antenna which comprises a metal slot, a quarter wavelength converter, a first coupling piece connected to one end of the quarter wavelength converter and a second coupling piece connected to the other end of the quarter wavelength converter, wherein the metal slot comprises two opposite upper slot walls and lower slot walls, the first coupling piece is coupled with the upper slot walls for feeding, and the second coupling piece is coupled with the lower slot walls for feeding.
Further, the first coupling piece, the second coupling piece and the quarter wavelength converter are arranged in parallel.
Further, the coupling feed type right-hand circularly polarized antenna further comprises an impedance tuning branch vertically arranged on the quarter-wavelength converter.
Further, the coupling feed type right-hand circular polarized antenna further comprises a PCB board, and the quarter wavelength converter, the first coupling piece, the second coupling piece and the impedance tuning branch are all arranged on the front face of the PCB board.
Further, the coupled feed type right-hand circularly polarized antenna further comprises a coaxial feeder, and a core wire of the coaxial feeder is connected with the end part of the quarter wavelength converter.
Further, a first copper exposure area is arranged on the back surface of the PCB, the first copper exposure area is formed by extending the end part of the quarter wavelength converter, and a core wire of the coaxial feeder is connected with the first copper exposure area.
Further, the back side of the PCB board is also provided with a second copper exposure area, a conductive cloth and a conductive copper foil, the coaxial feeder is provided with a first exposed shielding layer area and a second shielding layer area, the first shielding layer area is arranged in the middle of the coaxial feeder and is connected with the conductive cloth, the second shielding layer area is arranged between the conductive cloth and the first copper exposure area and is connected with the conductive copper foil and the second copper exposure area, and the conductive cloth and the conductive copper foil are respectively grounded.
Further, the length of the quarter wavelength converter is one quarter of the wavelength of the center frequency of the coupling feed type right-hand circularly polarized antenna, and the length of the metal slot is slightly larger than that of the quarter wavelength converter.
Further, the metal groove is arranged on a metal frame of the mobile terminal, and the metal frame and a metal middle frame of the mobile terminal are integrated.
Further, the right-hand circularly polarized antenna is a GPS antenna.
The metal outer frame is designed into the antenna radiation body, so that the problems of difficult realization of circular polarization, poor roundness of the directional diagram, low gain and low efficiency of the antenna in the machine body are solved, the right-hand circular polarization effect with high gain, high efficiency and good roundness of the directional diagram can be realized in the metal machine body and complex internal electronic environment, the required clearance is small, and the cost is low and the realization is easy.
Drawings
FIG. 1 is a schematic diagram of the position structure of a metal trough according to the present invention.
Fig. 2 is a schematic diagram of a front structure of an antenna feed network according to the present invention.
Fig. 3 is a schematic diagram of a back side structure of the antenna feed network of the present invention.
Fig. 4 is a schematic diagram of the back structure of the antenna feed network of the present invention.
Fig. 5 is a return loss diagram of embodiment 2 of the present invention.
Fig. 6 is a graph of radiation efficiency for example 2 of the present invention.
FIG. 7 is a right-hand circular polarization pattern of the plane YZ of example 2 of the present invention.
Wherein the PCB is 1; the PCB groove is 2; the common groove is 3; the metal frame is 4; the main board is 5; the metal middle frame is 6; the first coupling piece is 7; the second coupling piece is 8; the quarter wavelength converter is 9; impedance tuning branches 10, 11 and 12; the copper exposure areas are 13 and 14; 15 parts of conductive copper foil; the conductive cloth is 16; the coaxial feed line is 17.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings so that the advantages and features of the present invention will be more readily understood by those skilled in the art, thereby more clearly defining the scope of the present invention.
Example 1:
the coupled feed type right-hand circularly polarized antenna in this embodiment is shown in fig. 1 to 4. The antenna feed network comprises a PCB (printed circuit board) 1, a metal slot, a quarter wavelength converter 9, an impedance tuning branch, a first coupling piece 7 and a second coupling piece 8, wherein an antenna feed network consisting of the quarter wavelength converter, the impedance tuning branch, the first coupling piece and the second coupling piece is arranged on the same surface of the PCB, the length of the quarter wavelength converter is one quarter of the wavelength of the central frequency of the antenna, the first coupling piece and the second coupling piece are respectively connected at two ends of the quarter wavelength converter in parallel, and a plurality of impedance tuning branches are vertically connected to the quarter wavelength converter and used for tuning the resonance frequency; the metal slot is rectangular, the length is slightly larger than that of the quarter wavelength converter, the quarter wavelength converter comprises two opposite upper slot walls and lower slot walls, the first coupling piece is coupled with the upper slot walls for feeding, and the second coupling piece is coupled with the lower slot walls for feeding.
In the embodiment, by feeding the end part of the quarter wavelength converter, two paths of current signals generate 90-degree phase difference, and two current oscillation modes with mutually orthogonal polarizations are excited on the edges of the coupled grooves through two coupling pieces respectively, so that a right-hand circular polarization signal is synthesized.
Example 2:
based on embodiment 1, in this embodiment, a mobile terminal with an external dimension of 153mm x 85mm x 16mm is taken as an example, and an application form of the coupling feed type right-hand circular polarized antenna is specifically described.
The metal frame and the metal middle frame of the mobile terminal are integrated; the metal groove is arranged on the top (facing the top) metal frame and comprises a PCB groove and a common groove; the antenna housing, the PCB groove and the common groove are sequentially arranged from outside to inside of the mobile terminal, the size of the antenna housing is 75mm x 12mm, the size of the PCB is 64mm x 9mm x 0.35mm, and the size of the common groove is 58mm x 7.8mm; because the clearance area required by the antenna is small, the distance between the circuit board and the metal frame in the mobile terminal is 2mm, and the height of the main board and the conductive foam is 9mm, the vertical clearance height of the antenna is 7mm, and the horizontal clearance height is only 2mm; the shielding cover below the circuit board is attached with a conductive foam surface to fully cover the middle frame ground, so that the interference of an internal circuit on the antenna can be reduced as much as possible. The radome is made of conventional ABS plastic, the left side and the right side of the radome are respectively provided with a buckling position which is buckled in a positioning column of the metal frame, the inner side of the radome is tightly attached to the PCB for fixing and protecting the PCB, the length and the width of the radome can be both greater than 2mm of the PCB, the PCB is tightly pressed through the positioning column on the metal frame and the radome at the outer side to fix the positions, and the radome has a stable coupling effect. The PCB is made of conventional RF-4 material, and the length and width dimensions of the PCB are slightly larger than those of the common groove. The surface of the PCB and the radome is printed with a feed network wiring as in the embodiment 1, the size of the coupling piece is 10mm 1mm, 3 impedance tuning branches 9, 10 and 11 are arranged on the quarter-wavelength converter for adjusting the resonance center frequency of the antenna to 1575MHz, and the quarter-wavelength converter is a section of printed copper with quarter wavelength length corresponding to 1575 MHz; the other surface of the PCB is provided with two copper exposure areas 13 and 14, the copper exposure area 13 is welded with a core wire of a coaxial feeder 17 as a feeding point to be conducted with an antenna feeding network, the copper exposure area 14 is welded with the conductive copper foil 15 to be conducted to the metal middle frame 6 to be grounded, and then the copper foil is welded with a shielding layer of the coaxial wire. The middle part of the coaxial line is stripped to expose the shielding layer, and the shielding layer is wound with the conductive cloth 16, the conductive cloth is stuck to the metal middle frame to be grounded after the antenna is assembled, and the interference of current radiation on the coaxial line to the antenna body can be effectively reduced indirectly in the coaxial line. The traces (except for conductive copper foil, conductive cloth and coaxial feeder) on the front and back sides of the PCB can be printed copper.
As shown in fig. 5, the two-path polarized current generates two resonances at 1700MHz, and the electric lengths of the two paths of currents are not consistent after the impedance tuning branch is added to be lengthened to 1575MHz due to the fact that the resonances are short, the resonance distances are shortened and gradually combined, and the phase difference is slightly deviated from 90 °. As shown in fig. 6 and 7, the efficiency of the GPS antenna in the 1575MHz ±20MHz frequency band can reach 33% -36%, the right-hand circular polarization gain at the terminal use angle (facing vertically to the sky direction ±60°) can reach 2dBi at maximum, and the efficiency and the directional diagram of the GPS antenna are obviously improved compared with those of the built-in antenna in the complex electronic environment of the metal terminal equipment, so that the use requirement of the positioning terminal equipment can be met.
In the embodiment, by feeding the end part of the quarter wavelength converter, two paths of current signals generate 90-degree phase difference, and two current oscillation modes with mutually orthogonal polarizations are excited on the frame and the middle frame respectively through two coupling sheets attached to the surface of the metal groove and coupled with the two coupling sheets, so that right-hand circular polarization signals are synthesized. According to the embodiment, the metal outer frame is designed into the antenna radiation body, the problems that circular polarization in the body is difficult to achieve, the roundness of the directional diagram is poor, the gain is low and the efficiency is low are solved, the right-hand circular polarization effect with high gain, high efficiency and good roundness of the directional diagram can be achieved under the metal body and complex internal electronic environment, the required clearance is small, and the cost is low and the implementation is easy.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (9)
1. The coupling feed type right-hand circularly polarized antenna is characterized by comprising a metal slot, a quarter wavelength converter, a PCB (printed circuit board), a first coupling piece connected to one end of the quarter wavelength converter and a second coupling piece connected to the other end of the quarter wavelength converter, wherein the metal slot comprises two opposite upper slot walls and lower slot walls, the first coupling piece is coupled with the upper slot walls for feeding, and the second coupling piece is coupled with the lower slot walls for feeding; the quarter wavelength converter, the first coupling piece, the second coupling piece and the impedance tuning branch are all arranged on the front surface of the PCB.
2. The coupled feed right-hand circularly polarized antenna of claim 1, wherein the first coupling tab, the second coupling tab, and the quarter-wavelength transformer are disposed in parallel.
3. The coupled fed right-hand circularly polarized antenna of claim 1 further comprising an impedance tuning branch disposed vertically on the quarter wavelength transformer.
4. The coupled fed right-hand circularly polarized antenna of claim 1 further comprising a coaxial feed, a core of the coaxial feed being connected to an end of the quarter wavelength converter.
5. The coupled feed right-hand circularly polarized antenna according to claim 4, wherein a first copper exposure area is arranged on the back surface of the PCB, the first copper exposure area is formed by extending an end portion of the quarter wavelength converter, and a core wire of the coaxial feed line is connected with the first copper exposure area.
6. The coupled feed type right-hand circularly polarized antenna according to claim 5, wherein a second copper exposure area, a conductive cloth and a conductive copper foil are further arranged on the back surface of the PCB, the coaxial feeder is provided with a first exposed shielding layer area and a second shielding layer area, the first shielding layer area is arranged in the middle of the coaxial feeder and is connected with the conductive cloth, the second shielding layer area is arranged between the conductive cloth and the first copper exposure area and is connected with the conductive copper foil and the second copper exposure area, and the conductive cloth and the conductive copper foil are respectively grounded.
7. The coupling fed right-hand circularly polarized antenna of claim 1, wherein the quarter wavelength converter has a length that is one quarter of a wavelength of a center frequency of the coupling fed right-hand circularly polarized antenna, and the metallic slot has a length that is slightly greater than the quarter wavelength converter.
8. The coupled feed right-hand circularly polarized antenna of claim 1, wherein the metal slot is disposed on a metal bezel of the mobile terminal, the metal bezel being integral with a metal center of the mobile terminal.
9. The coupled feed right-hand circularly polarized antenna of any one of claims 1-8, wherein the right-hand circularly polarized antenna is a GPS antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710791889.3A CN107611583B (en) | 2017-09-05 | 2017-09-05 | Coupled feed type right-hand circular polarized antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710791889.3A CN107611583B (en) | 2017-09-05 | 2017-09-05 | Coupled feed type right-hand circular polarized antenna |
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| Publication Number | Publication Date |
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| CN107611583A CN107611583A (en) | 2018-01-19 |
| CN107611583B true CN107611583B (en) | 2023-10-20 |
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| CN201710791889.3A Active CN107611583B (en) | 2017-09-05 | 2017-09-05 | Coupled feed type right-hand circular polarized antenna |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109216942B (en) * | 2018-09-11 | 2023-12-19 | 深圳市信维通信股份有限公司 | 5G millimeter wave mobile terminal antenna system based on metal frame |
| CN111788612B (en) * | 2018-12-06 | 2022-04-08 | 深圳市彩源光电有限公司 | Automobile data recorder |
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| CN103337696A (en) * | 2013-04-08 | 2013-10-02 | 中国人民解放军空军工程大学 | Variable polarization panel antenna unit |
| WO2014029156A1 (en) * | 2012-08-23 | 2014-02-27 | 广东欧珀移动通信有限公司 | Antenna device for mobile communication terminal |
| CN103811864A (en) * | 2014-01-25 | 2014-05-21 | 惠州硕贝德无线科技股份有限公司 | Double-frequency coupled antenna with metal frame |
| WO2014106440A1 (en) * | 2013-01-07 | 2014-07-10 | 华为终端有限公司 | Metal ring coupled antenna and handheld communication device |
| CN204375953U (en) * | 2014-12-18 | 2015-06-03 | 东莞劲胜精密组件股份有限公司 | A kind of multiband closes wireloop antenna and mobile device |
| CN104901007A (en) * | 2015-06-24 | 2015-09-09 | 中国电子科技集团公司第五十四研究所 | Slot-coupled circularly-polarized micro-strip antenna |
| CN105226386A (en) * | 2015-09-23 | 2016-01-06 | 深圳市万普拉斯科技有限公司 | The circular polarized antenna structure of mobile terminal and mobile terminal |
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2017
- 2017-09-05 CN CN201710791889.3A patent/CN107611583B/en active Active
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| WO2014029156A1 (en) * | 2012-08-23 | 2014-02-27 | 广东欧珀移动通信有限公司 | Antenna device for mobile communication terminal |
| WO2014106440A1 (en) * | 2013-01-07 | 2014-07-10 | 华为终端有限公司 | Metal ring coupled antenna and handheld communication device |
| CN103337696A (en) * | 2013-04-08 | 2013-10-02 | 中国人民解放军空军工程大学 | Variable polarization panel antenna unit |
| CN103811864A (en) * | 2014-01-25 | 2014-05-21 | 惠州硕贝德无线科技股份有限公司 | Double-frequency coupled antenna with metal frame |
| CN204375953U (en) * | 2014-12-18 | 2015-06-03 | 东莞劲胜精密组件股份有限公司 | A kind of multiband closes wireloop antenna and mobile device |
| CN104901007A (en) * | 2015-06-24 | 2015-09-09 | 中国电子科技集团公司第五十四研究所 | Slot-coupled circularly-polarized micro-strip antenna |
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| CN107611583A (en) | 2018-01-19 |
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