CN202905937U - Array antenna of roadside unit and electronic toll collection system - Google Patents
Array antenna of roadside unit and electronic toll collection system Download PDFInfo
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- CN202905937U CN202905937U CN 201220575657 CN201220575657U CN202905937U CN 202905937 U CN202905937 U CN 202905937U CN 201220575657 CN201220575657 CN 201220575657 CN 201220575657 U CN201220575657 U CN 201220575657U CN 202905937 U CN202905937 U CN 202905937U
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- array antenna
- roadside device
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Abstract
The utility model provides an array antenna of a roadside unit and an electronic toll collection (ETC) system. The array antenna mainly comprises an antenna matrix, and a feed network connected with the antenna matrix, wherein the antenna matrix comprises at least 12 antenna elements, each row in the antenna matrix is symmetrically distributed around a column center line of the antenna matrix, two sides of a center line of each row in the antenna matrix are respectively provided with 3 antenna elements, the feed network comprises cascaded impedance conversion sections, and a square hole is etched in the interior of each antenna element. According to the array antenna of the roadside unit, the square holes are eched in the interior of the antenna elements so as to effectively adjust the size of the antenna elements; equilateral right-angled triangles are added at symmetric corners of -45 degrees in the square holes so as to realize the right-handed circular polarization effect; and by adopting the antenna elements of high input impedance, the influence of the feed network on the overall performance of the antenna can be effectively reduced, and the loss of the feed network can be reduced.
Description
Technical field
The utility model relates to communication technical field, relates in particular to a kind of RSU(Roadside Unit, roadside device) array antenna and ETC(Electronic Toll Collection, electric non-stop toll) system.
Background technology
The ETC system is the present autoelectrinic Fare Collection System of main research and extension in the world, is applicable to the vehicle toll solution under the bridge tunnel environment of highway and heavy traffic.RSU(Roadside Unit, roadside device) be the standard fitting of ETC system, generally install on the track of charge station.When vehicle when the ETC track, OBU(On Board Unit, board units) with RSU by antenna transmission and received RF signal, need not stop and can finish the ETC charge, thereby improve the automobile passage rate, effectively solve traffic blocking problem.
In the charging process of above-mentioned ETC system, RSU guarantees effective covering of carriageway surfacing with built-in circular polarised array antenna, and therefore, circular polarised array antenna is the critical elements that realizes the ETC Fare Collection System.
The utility model content
Embodiment of the present utility model provides array antenna and the ETC system of a kind of RSU, is effectively applied to the ETC system to realize little band circular polarised array antenna.
A kind of array antenna of roadside device comprises:
Antenna array, with the feeding network that is connected with described antenna array, described antenna array comprises at least 12 bays, every delegation in the described antenna array is symmetrical around the row center line of antenna array, every delegation 3 bays that distribute respectively on the both sides of the center line of antenna array, described feeding network comprises the transformer section of cascade, the inside etching square opening of each bay.
Can be found out that by the technical scheme that above-mentioned embodiment of the present utility model provides the array antenna of the RSU that the utility model embodiment provides is for effectively regulating the size of bay, at the inner etching square opening of the square array element of antenna.For realizing the right-handed circular polarization effect, increase equilateral right-angled triangle in inner-45 ° of symmetric angle of square hole.Adopt simultaneously the bay of high input impedance, can effectively reduce feeding network to the impact of antenna overall performance, reduce the loss of feeding network.
Description of drawings
The concrete structure schematic diagram of the array antenna of a kind of RSU that Fig. 1 provides for the utility model embodiment;
The concrete structure figure of a kind of impedance transformer network that Fig. 2 provides for the utility model embodiment;
The return loss plot schematic diagram of the array antenna of a kind of RSU that Fig. 3 provides for the utility model embodiment;
The far field direction schematic diagram of the array antenna of a kind of RSU that Fig. 4 provides for the utility model embodiment;
The axial ratio schematic diagram of the array antenna of a kind of RSU that Fig. 5 provides for the utility model embodiment.
Embodiment
For ease of the understanding to the utility model embodiment, be further explained explanation below in conjunction with accompanying drawing as an example of several specific embodiments example, and each embodiment does not consist of the restriction to the utility model embodiment.
The concrete structure schematic diagram of the array antenna of a kind of RSU that the utility model embodiment provides as shown in Figure 1, comprise: antenna array, with the feeding network that is connected with described antenna array, described antenna array comprises at least 12 bays, every delegation in the described antenna array is symmetrical around the row center line of antenna array, every delegation 3 bays that distribute respectively on the both sides of the center line of antenna array, described feeding network comprises the transformer section of cascade, the inside etching square opening of each bay.
In Fig. 1, the 2x6 antenna array that is comprised of 12 bays 11,12,13,14,15,16,17,18,19,20 and 21, and feeding network comprise a plurality of antennas in each bay.
Above-mentioned bay 11,12,13,14,15,16 is equidistant, straight line is arranged in the first row, above-mentioned bay 17,18,19,20,21 and 22 is equidistant, straight line is arranged in the second row, above-mentioned the first row, 6 bays in the second row are symmetrical on the center line both sides of antenna array, bay 11 in the first row is set on the left side of the row center line of antenna array, 12,13, bay 17 in the second row, 18,19, the bay 14 in the first row is set on the right of the row center line of antenna array, 15,16, bay 20 in the second row, 21 and 22.Be 0.5 ~ 0.6 wavelength with the distance between the bay of delegation, can effectively reduce minor level.The bay unit adopts integrated coplanar feed microstrip line, and each antenna element adopts the high input impedance mode.
For effectively regulating the size of array element, at the inside of each bay etching square opening 31.For realizing the right-handed circular polarization effect, the inside-45 ° symmetric angle in row hole 31, side increases equilateral right-angled triangle.Adopt simultaneously the bay of high input impedance, can effectively reduce feeding network to the impact of antenna overall performance.
Above-mentioned impedance transformer network as shown in Figure 2, above-mentioned feeding network comprises input port A(distributing point), 12 output port B1 ~ B12 and a plurality of microstrip line.Be symmetrical arranged respectively 6 output ports on the both sides of described distributing point, 6 output ports that arrange on one side of described distributing point setting that is divided into two lines, 3 output ports of every delegation.
The input port of bay 11 is connected output port B1 and is connected with feeding network, the input port of bay 12 is connected output port B2 and is connected with feeding network, the input port of bay 13 is connected output port B3 and is connected with feeding network, the input port of bay 14 is connected output port B4 and is connected with feeding network, the input port of bay 15 is connected output port B5 and is connected with feeding network, the input port of bay 16 is connected output port B6 and is connected with feeding network, the input port of bay 17 is connected output port B7 and is connected with feeding network, the input port of bay 18 is connected output port B8 and is connected with feeding network, the input port of bay 19 is connected output port B9 and is connected with feeding network, the input port of bay 20 is connected output port B10 and is connected with feeding network, the input port of bay 21 is connected output port B11 and is connected with feeding network, the input port of bay 22 is connected output port B12 and is connected with feeding network.
The impedance transformer of the λ of existence 4 assistant wardens connection/4 between each output port, output drive distribute and meet Dao Erfu-Chebyshev inequality distribution.Be positioned at the mode that adopts series feed with the bay of delegation, the distance between each bay is wavelength on 0.7 line, and the feeder line overall length is λ.Microstrip line length between each output port is λ, and the phase difference of each output port is zero.
The return loss plot schematic diagram of the array antenna of a kind of RSU that Fig. 3 provides for the utility model embodiment, the return loss schematic diagram has reflected the ability of the forward energy on this day line absorption feeder, in Fig. 3, abscissa represents the frequency of the signal of antenna reception, and ordinate represents the return loss of antenna under different frequency.As seen from Figure 3, antenna greater than-20dB, satisfies the needs of ETC system in-bandwidth below the 10dB near 400MHz in the return loss at 5.8GHz place.The far-field pattern of the array antenna of a kind of RSU that the utility model embodiment provides as shown in Figure 4, in Fig. 4, abscissa represents the angle of radiation of antenna, and ordinate is illustrated in the main lobe gain of antenna under the different angle of radiation, by 4 figure as can be known, as seen from the figure, the antenna main lobe gain is 17dB, and the first secondary lobe is-6dB that the HPBW of perpendicualr field is 20 °, front and back can effectively solve monkey chatter problem in the ETC system than reaching 30dB.Fig. 5 is the axial ratio schematic diagram of the array antenna of RSU, in Fig. 5, abscissa represents the angle of radiation of antenna, ordinate is illustrated in the axial ratio of different angle of radiation antennas, as seen from Figure 5, this circularly polarization microstrip array antenna is at the 5.8GHz frequency, and axial ratio is about 1.5dB, can satisfy requirement of engineering fully.
The embodiment of the invention also provides a kind of ETC system, comprises RSU in this ETC system, comprises above-mentioned array antenna shown in Figure 1 among this RSU.
One of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of an embodiment, and the module in the accompanying drawing or flow process might not be that enforcement the utility model is necessary.
One of ordinary skill in the art will appreciate that: the module in the equipment among the embodiment can be described according to embodiment and be distributed in the equipment of embodiment, also can carry out respective change and be arranged in the one or more equipment that are different from present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
In sum, the array antenna of the RSU that the utility model embodiment provides is for effectively regulating the size of bay, at the inner etching square opening of the square array element of antenna.For realizing the right-handed circular polarization effect, increase equilateral right-angled triangle in inner-45 ° of symmetric angle of square hole.Adopt simultaneously the bay of high input impedance, can effectively reduce feeding network to the impact of antenna overall performance, reduce the loss of feeding network.
The array antenna of the RSU that the utility model embodiment provides adopts the series feed network, effectively reduces the feeding network complexity.The excitation amplitude distribution of bay distributes according to Dao Erfu-Chebyshev inequality, and then the impedance that draws feed lines at different levels, and carries out λ/4 impedance transformer transforming impedances.Feeder line distance is 0.7 λ between the unit, and the feeder line overall length is λ, guarantee between the unit excitation phase poor be zero.
The array antenna simplicity of design of the RSU that the utility model embodiment provides, production cost is low, has good low-sidelobe level, meets present national standard, satisfies the market demand of ETC roadside device.
The above; it only is the better embodiment of the utility model; but protection range of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claim.
Claims (9)
1. the array antenna of a roadside device is characterized in that, comprising:
Antenna array, with the feeding network that is connected with described antenna array, described antenna array comprises at least 12 bays, every delegation in the described antenna array is symmetrical around the row center line of antenna array, every delegation 3 bays that distribute respectively on the both sides of the center line of antenna array, described feeding network comprises the transformer section of cascade, the inside etching square opening of each bay.
2. the array antenna of roadside device according to claim 1 is characterized in that, ° symmetric angle increases equilateral right-angled triangle in the inside-45 of the square opening of each bay.
3. the array antenna of roadside device according to claim 1 is characterized in that, is positioned at the mode that adopts series feed with the bay of delegation, and the distance between each bay is wavelength on 0.7 line.
4. according to claim 1 to the array antenna of 3 each described roadside devices, it is characterized in that described feeding network is the series feed network.
5. the array antenna of roadside device according to claim 4, it is characterized in that, described feeding network comprises a distributing point and 12 output ports, and the microstrip line that connects described distributing point and output port, be symmetrical arranged respectively 6 output ports on the both sides of described distributing point, 6 output ports that arrange on one side of described distributing point setting that is divided into two lines, 3 output ports of every delegation.
6. the array antenna of roadside device according to claim 5 is characterized in that, each bay connects from the different output port of feeding network respectively.
7. the array antenna of roadside device according to claim 6 is characterized in that the feed place excitation amplitude of each bay distributes according to Dao Erfu-Chebyshev's formula, and it is zero that the feed place of each bay encourages amplitude-phase poor.
8. the array antenna of roadside device according to claim 6 is characterized in that, each bay adopts high input impedance mode, and the impedance transformer of the λ of 4 assistant wardens connection/4 is set between each output port.
9. an electronic charging system without parking is characterized in that, comprising: roadside device comprises the array antenna of described each described roadside device of claim 1 to 8 in the described roadside device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220575657 CN202905937U (en) | 2012-11-02 | 2012-11-02 | Array antenna of roadside unit and electronic toll collection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220575657 CN202905937U (en) | 2012-11-02 | 2012-11-02 | Array antenna of roadside unit and electronic toll collection system |
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| Publication Number | Publication Date |
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| CN202905937U true CN202905937U (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220575657 Expired - Lifetime CN202905937U (en) | 2012-11-02 | 2012-11-02 | Array antenna of roadside unit and electronic toll collection system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207423A (en) * | 2016-06-26 | 2016-12-07 | 中国电子科技集团公司第三十八研究所 | A kind of slant-polarized antennas and the aerial array of composition thereof |
| CN104332713B (en) * | 2014-11-14 | 2017-03-15 | 南京理工大学 | Monolayer double frequency round polarized micro-strip array antenna |
| CN112531355A (en) * | 2020-11-27 | 2021-03-19 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | +/-45-degree dual-polarized millimeter wave array antenna |
-
2012
- 2012-11-02 CN CN 201220575657 patent/CN202905937U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332713B (en) * | 2014-11-14 | 2017-03-15 | 南京理工大学 | Monolayer double frequency round polarized micro-strip array antenna |
| CN106207423A (en) * | 2016-06-26 | 2016-12-07 | 中国电子科技集团公司第三十八研究所 | A kind of slant-polarized antennas and the aerial array of composition thereof |
| CN106207423B (en) * | 2016-06-26 | 2019-09-17 | 中国电子科技集团公司第三十八研究所 | A kind of aerial array of slant-polarized antennas and its composition |
| CN112531355A (en) * | 2020-11-27 | 2021-03-19 | 中国电波传播研究所（中国电子科技集团公司第二十二研究所） | +/-45-degree dual-polarized millimeter wave array antenna |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130424 |
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| CX01 | Expiry of patent term |