CN204375917U - A kind of electronic license plate antenna based on RFID - Google Patents
A kind of electronic license plate antenna based on RFID Download PDFInfo
- Publication number
- CN204375917U CN204375917U CN201420813483.2U CN201420813483U CN204375917U CN 204375917 U CN204375917 U CN 204375917U CN 201420813483 U CN201420813483 U CN 201420813483U CN 204375917 U CN204375917 U CN 204375917U
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- CN
- China
- Prior art keywords
- rfid
- license plate
- antenna
- electronic license
- radiating element
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- Expired - Fee Related
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Abstract
The utility model discloses a kind of electronic license plate antenna based on RFID, by the gap width of a U-shaped slot antenna and the design of length, in conjunction with rectangular saw-tooth, antenna is regulated, thus reach the demand of working frequency range.Result shows, is less than-10dB in 2.380GHz ~ 2.498GHz return loss, has enough bandwidth to cover 2.45GHz band limits.The utility model has that structure is simple, cost is low, easy making and be convenient to the features such as same circuit is integrated, and within the scope of whole working band, demonstrate comparatively good directivity and recognition range performance far away, active electronic vehicle license plate system in intelligent transportation can be widely used in.
Description
Technical field
The utility model belongs to mobile communication system and wireless communication field, is specifically related to a kind of design of the electronic license plate antenna based on RFID.
Background technology
In the selection of the automatic identification equipment that information of vehicles is identified, the advantage that radio-frequency (RF) identification (RFID) technology has other recognition technologies incomparable.Now, the electronic license plate of design and devdlop is generally that label and traditional car plate are separated, such as most application is placed on windshield by label, or any place that can see in automobile, even carried with by driver, these application modes also exist the drawback in performance and safety, and real electronic license plate should be traditional vehicle number plate and electronic tag combines together, the research that the design makes based on this just, RFID label tag is embedded car plate, and by the design of antenna also based on the structure of car plate itself.
For several conventional label antenna, wherein micro-strip paster antenna and dipole antenna were all once applied in electronic license plate, but the antenna of these types is all placed in car plate rear, there are some drawbacks, make because the car plate of the overwhelming majority is also metal material, the impact of antenna pattern be can not ignore.And slot antenna normally on a metal object fluting realize, its cost low, easy making and to be easy to same circuit integrated.Because car plate is metal material, car plate itself is so directly utilized preferably to select to design slot antenna one of can yet be regarded as.
Utility model content
The purpose of this utility model is the design providing a kind of electronic license plate antenna based on RFID, implementation structure is simple, reduce costs, be convenient to promote, and meet antenna structure simple, be easy to the technical characterstic that existing car plate combines and be convenient to microwave integrated circuit process.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts is as follows:
A kind of electronic license plate antenna based on RFID, comprise 92 formula car plates 1, be positioned at the main radiating element 2 on 92 formula car plates 1, be positioned at the RFID active chip 3 inside 92 formula car plates 1, described main radiating element 2 is the slot antenna of directly fluting on 92 formula car plates 1,92 formula car plates are directly slotted out main radiating element 2, the rectangular saw-tooth 5 progressively increased on main radiating element 2 also adjusts its position, is optimized improvement to impedance matching feeder line 4 structure.
Further, a kind of electronic license plate antenna based on RFID, described main radiating element 2 is connected to active chip 3 by feeder line 4.
Further, a kind of electronic license plate antenna based on RFID, described micro-main radiating element 2, impedance matching feeder line 4 are symmetrical along same vertical central axis.
By increasing and optimizing rectangular saw-tooth projection 5 on main radiating element 2, increase the length of long side seam gap, overcome the restriction of car plate size for design, make designed slot antenna have enough bandwidth to cover the frequency range of rfid system, meet the needs in practical application.
The utility model is directly slotted and is realized slot antenna on existing car plate, and its implementation structure is simple, cost is low, be convenient to popularization, and is easy to combine with existing car plate, is convenient to microwave integrated circuit process, suitable for large-scale promotion.
Accompanying drawing explanation
The front schematic view of Fig. 1 the design antenna structure.
The schematic rear view of Fig. 2 the design antenna structure.
The S11 Parameter Map of Fig. 3 the design antenna.
During Figure 42 .45GHz, angle is the two-dimensional directional figure of 0 °
During Figure 52 .45GHz, angle is the two-dimensional directional figure of 42 °
During Figure 62 .45GHz, angle is the two-dimensional directional figure of 328 °
In figure: 1 nine two formula car plates, 2 main radiating element, 32.45GHz active RFID chips, 4 feeder lines, 5 rectangular configuration.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further detailed.
Fig. 1 is the front schematic view of the design, and Fig. 2 is the schematic rear view of the design.Based on the design of the electronic license plate antenna of RFID, comprise 92 formula car plates 1, be positioned at the main radiating element 2 on 92 formula car plates 1, be positioned at the RFID active chip 3 inside 92 formula car plates 1, it is characterized in that: described main radiating element 2 is the slot antenna of directly fluting on 92 formula car plates 1; Described main radiating element 2 is connected to active chip 3 by feeder line 4; Described micro-main radiating element 2, impedance matching feeder line 4 are symmetrical along same vertical central axis.
By increasing and optimizing rectangular saw-tooth projection 5 on main radiating element 2, increase the length of long side seam gap, overcome the restriction of car plate size for design, when rectangular saw-tooth projection 5 be increased to 22mm time, antenna resonance is at 2.430GHz, the working frequency range scope of this antenna is 2.380GHz ~ 2.498GHz, and bandwidth is 118MHz, as shown in Figure 3.As can be seen from result, designed slot antenna has enough bandwidth to cover 2.45GHz band limits, can meet the needs in practical application.
Fig. 4 is to the two-dimensional directional figure of antenna when Figure 6 shows that frequency is 2.45GHz when different angles.As can be seen from the figure antenna energy is in the distribution situation in space.The maximum gain of this antenna is 10.6dBi, illustrates that this antenna is a high-gain aerial.Above-mentioned directional diagram can meet the needs of practical application, in electronic license plate recognition system, can reader be placed on the lamppost in roadside, the wave beam of both sides updip can make reader communicate with electronic license plate, also reader can be erected at the top of charge station, the wave beam of middle updip can make reader communicate with electronic license plate.
Claims (3)
1. the electronic license plate antenna based on RFID, comprise 92 formula car plates (1), be positioned at the main radiating element (2) on 92 formula car plates (1), be positioned at the RFID active chip (3) of 92 formula car plate (1) inner sides, 92 formula car plates directly to be slotted out main radiating element (2), progressively increase the rectangular saw-tooth (5) on main radiating element (2) and adjust its position, improvement is optimized to impedance matching feeder line (4) structure.
2., as claimed in claim 1 based on the electronic license plate antenna of RFID, it is characterized in that: described main radiating element (2) is connected to active chip (3) by feeder line (4).
3., as claimed in claim 2 based on the electronic license plate antenna of RFID, described main radiating element (2), impedance matching feeder line (4) are symmetrical along same vertical central axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420813483.2U CN204375917U (en) | 2014-12-19 | 2014-12-19 | A kind of electronic license plate antenna based on RFID |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420813483.2U CN204375917U (en) | 2014-12-19 | 2014-12-19 | A kind of electronic license plate antenna based on RFID |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204375917U true CN204375917U (en) | 2015-06-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420813483.2U Expired - Fee Related CN204375917U (en) | 2014-12-19 | 2014-12-19 | A kind of electronic license plate antenna based on RFID |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204375917U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466364A (en) * | 2014-12-19 | 2015-03-25 | 周祥 | Electronic license plate antenna based on RFID |
| CN107946737A (en) * | 2017-11-06 | 2018-04-20 | 徐州工程学院 | A kind of car plate and its manufacture method with radio frequency recognition function |
-
2014
- 2014-12-19 CN CN201420813483.2U patent/CN204375917U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466364A (en) * | 2014-12-19 | 2015-03-25 | 周祥 | Electronic license plate antenna based on RFID |
| CN107946737A (en) * | 2017-11-06 | 2018-04-20 | 徐州工程学院 | A kind of car plate and its manufacture method with radio frequency recognition function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150603 Termination date: 20151219 |
|
| EXPY | Termination of patent right or utility model |