CN101807749A - Circularly polarized array antenna for RFID (Radio Frequency Identification) vehicle management field - Google Patents
Circularly polarized array antenna for RFID (Radio Frequency Identification) vehicle management field Download PDFInfo
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- CN101807749A CN101807749A CN200910046195A CN200910046195A CN101807749A CN 101807749 A CN101807749 A CN 101807749A CN 200910046195 A CN200910046195 A CN 200910046195A CN 200910046195 A CN200910046195 A CN 200910046195A CN 101807749 A CN101807749 A CN 101807749A
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Abstract
本发明属于无线通讯领域，具体涉及一种用于RFID车辆管理领域的圆极化阵列天线。射频识别技术对行使的车辆识别管理时，一方面要求RFID读写器天线与车辆RFID电子车牌的极化匹配良好，另一方面要求RFID读写器天线能有较高的增益，以便实现对带有RFID电子车牌的车辆的高效可识别管理。天线作为RFID读写器的接收和发射终端设备，天线的性能指标是影响RFID读写性能好坏的主导因素。为此，本发明设计一种用于RFID车辆管理的圆极化阵列天线，实现RFID对带有RFID电子车牌的车辆的高效率管理目的。
The invention belongs to the field of wireless communication, and in particular relates to a circularly polarized array antenna used in the field of RFID vehicle management. When radio frequency identification technology is used to identify and manage vehicles, on the one hand, it is required that the polarization of the RFID reader antenna and the vehicle's RFID electronic license plate match well; Efficient identifiable management of vehicles with RFID electronic license plates. The antenna is used as the receiving and transmitting terminal equipment of the RFID reader, and the performance index of the antenna is the dominant factor affecting the read and write performance of the RFID. For this reason, the present invention designs a circularly polarized array antenna for RFID vehicle management, so as to realize the high-efficiency management purpose of RFID for vehicles with RFID electronic license plates.
Description
Technical field
The invention belongs to field of wireless communication, specifically is the circular polarised array antenna in a kind of RFID of being used for vehicle management field
Background technology
The Chinese of Radio Frequency Identification (RFID) is a REID.Radio-frequency identification reader/writer is handled the entrained great deal of related information of label that is identified on the object by communication base station, and sets up database with the form of Network Transmission on the control backstage, realizes article " information resources socialization " management function.Radio-frequency (RF) identification (RFID) technology was established its theoretical foundation so far from 1948, its original basic theory and basic technology are very ripe, yet, be accompanied by popularizing of Internet technology in recent years, logistics, commerce, traffic, military logistics etc. some for the most responsive field of the demand of ecommerce, just take the lead in beginning implementation to the RFID The Application of Technology.With respect to the tional identification mode, as bar code recognition, image recognition, bio-identification, voice recognition etc., radio-frequency (RF) identification has little, noncontact affected by environment, contain much information and variable, anti-counterfeiting is functional, adapt to the advantage of handling and be convenient to unified management on a large scale.Than industrially developed country such as the U.S. early and Japan, it has obtained the promotion energetically of business and government as an industry, and has obtained great success in the RFID starting.Wal-Mart and the Metro two big global retailer giants RFID technology that takes the lead in proposing in its retail management, at first to use particularly, one time, the RFID technology becomes the focus of the world, domestic various medium follow-up reports, various constantly to propose based on " the integrated application service system of RFID " solution, also become the hot spot technology that use in fields such as gate inhibition's control, asset management, supply chain management and communications and transportation, indicating that research and development have begun to enter senior application model to the RFID application technology, entering " resource-type " socialization application and development phase.
At present, at field of traffic, " mass transit card " that use in the numerous cities of China, much all built-in RFID chip.China railways department relies on the RFID technology to be implemented in national unified dispatching buses, and has reduced administrative structure, has improved the efficiency of management.China's urban public utilities management, the sub-district parking lot management also begins to attempt and apply the RFID technology.
The most basic rfid system is made up of electronic tag, read write line, antenna and middleware.Wherein, electronic tag is managed the electronic ID card of goods and materials, is putting down in writing by the useful archive information of management goods and materials.Electronic tag is made up of chip and label antenna, communicates by inductance coupling high or electromagnetic backscatter principle and read write line, realizes the management function of rfid system.In the RFID Vehicular system, electronic tag is exactly a RFID automotive electronics car plate, putting down in writing the various information of vehicle, the identity card that is equivalent to vehicle, the RFID The Research of Antenna Polarization that is used in vehicle management at present is single, the vehicle that travels for different directions owing to the polarization of reading and writing device antenna and electronic license plate reason such as do not match might make reading and writing device antenna read the electronic license plate less than vehicle, causes very big trouble to management.This just requires reading and writing device antenna not only to have high gain also good with the electronic license plate Polarization match, could distinguish accurately information of vehicles.
Summary of the invention
The object of the present invention is to provide a kind of circular polarised array antenna, satisfy the function that existing RFID vehicle management system is accurately distinguished the RFID electronic license plate.Antenna of the present invention has high-gain and circular polarization and broadband character.
The present invention is achieved by the following technical solutions, the present invention includes: radiation element (1), air dielectric layer (2), the little band of feed (3), metal ground plate (4), short circuit pin (5), radiating element feed pin (6) and coaxial feed terminal (7).Implementation is: radiation element (1) is formed array structure by four metal unit, each radiative unit structure is square structure, and have a phase adjusted factor b, short circuit pin (5) has four, lay respectively at the center of four radiating elements, four short circuit pin two ends are connected with four metal unit with ground plate respectively.Radiating element feed pin (6) has four, and the little band of feed (3) is connected with four radiating elements by radiating element feed pin (6), and coaxial feed terminal (7) one ends are connected with metal ground plate (4), and an end is connected with the little band of feed (3).Implement by such structure, antenna of the present invention has high-gain, broadband and circular polarization characteristics.
Described a kind of circular polarised array antenna is 879MHz-960MHz in return loss less than the bandwidth of 10dB, the axial ratio of antenna in operating frequency is 920MHz-925MHz is less than 1, gain is greater than 12dBi, described circular polarised array antenna can be used as road traffic, RFID technical management reading and writing device antenna is adopted to vehicle in sub-districts etc., realizes information of vehicles is distinguished accurately.
The present invention and prior art contrast, and its effect is actively with tangible.Innovative point of the present invention just provides a kind of novelty simple in structure, and array antenna structure with high-gain, broadband, circular polarization, this scheme is applied to RFID vehicle management field, can be used as the rfid interrogator antenna, characteristics with high-gain, broadband and circular polarization can realize the vehicle electric car plate is accurately distinguished and the efficient management purpose.
Description of drawings
Fig. 1 is the circular polarised array antenna front and the construction profile in a kind of RFID of being used for vehicle management of the present invention field.
Fig. 2 is the return loss schematic diagram of circular polarised array antenna of the present invention.
Fig. 3 is the axial ratio and the gain schematic diagram of circular polarised array antenna of the present invention
Embodiment
Below in conjunction with accompanying drawing enforcement of the present invention is elaborated: originally being implemented in the technical solution of the present invention is to implement under the prerequisite, provided detailed execution mode, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, present embodiment comprises: radiation element 1, air dielectric layer 2, feed be little is with 3, metal ground plate 4, short circuit pin 5, radiating element feed pin 6 and coaxial feed terminal 7.Connected mode is: radiation element 1 is formed array structure by four metal unit, and short circuit pin 5 has four, and four short circuit pin two ends are connected with four metal unit with ground plate respectively.Radiating element feed pin 6 has four, and two ends are with 3 to be connected with four radiating elements and feed are little respectively, and coaxial feed terminal 7 one ends are connected with metal ground plate 4, and an end is with 3 to be connected with feed is little.
As shown in Figure 1, the radiation element 1 of circular polarised array antenna is positioned at above the air dielectric layer 2, and air dielectric layer 2 thickness are 21mm.It below the air gap 2 metal ground plate 4.Each radiative unit structure of radiation element 1 is square structure, and have a phase adjusted factor b, radiation element 1 is the ripple of 90 degree patterns in conjunction with phase adjusted factor b can form quadrature when working two phase phasic differences, and, make antenna in working frequency range, have circular polarization characteristics at space formation circularly polarised wave.Air dielectric layer 2 makes antenna have the broadband effect, and aerial array makes antenna have high gain characteristics.
The return loss of circular polarised array antenna shows among Fig. 2: circular polarized antenna is 879MHz-960MHz at the absolute bandwidth of return loss during less than-10dB.
Fig. 3 shows circular polarised array antenna, and axial ratio is less than 1 in operating frequency is 920MHz-925MHz, and gain is greater than 12dBi.
The course of work of the circular polarised array antenna in a kind of RFID of being used for vehicle management of the present invention field: radio frequency source by coaxial feed terminal 7, feed littlely be with 3, radiating element feed pin 6 gives radiation element 1 feed, radiation element 1 has phase adjusted factor b, the phase phasic difference that can encourage two quadratures is the mode wave of 90 degree, form circularly polarised wave, realize the circular polarization characteristics of antenna.Circular polarised array antenna of the present invention can be used as RFID vehicle management reading and writing device antenna, has the characteristics of high-gain, broadband and circular polarization, realizes that rfid system is to accurate recognition of vehicle electric car plate and efficient management purpose.
Claims (5)
1. circular polarised array antenna that is used for RFID vehicle management field, comprise: radiation element (1), air dielectric layer (2), the little band of feed (3), metal ground plate (4), short circuit pin (5), radiating element feed pin (6) and coaxial feed terminal (7), it is characterized in that: radiation element (1) is formed array structure by four metal unit, each radiative unit structure is square structure, and have a phase adjusted factor b, short circuit pin (5) has four, lay respectively at the center of four radiating elements, four short circuit pin two ends are connected with four metal unit of ground plate and radiation element respectively.Radiating element feed pin (6) has four, and the little band of feed (3) is connected with four radiating elements by radiating element feed pin (6), and coaxial feed terminal (7) one ends are connected with metal ground plate (4), and an end is connected with the little band of feed (3).
2. circular polarised array antenna that is used for RFID vehicle management field, it is characterized in that: radiation element (1) can form the right-handed circular polarization ripple in conjunction with phase adjusted factor b when antenna is worked, make antenna have circular polarization characteristics in working frequency range.
3. circular polarised array antenna that is used for RFID vehicle management field, it is characterized in that: air dielectric layer (2) makes antenna have the broadband effect.
4. circular polarised array antenna that is used for RFID vehicle management field, it is characterized in that: antenna is operated in uhf band and has high-gain, broadband and circular polarization characteristics, antenna is 879MHz-960MHz in the bandwidth of return loss during less than-10dB, the axial ratio of antenna in operating frequency is 920MHz-925MHz is less than 1, and gain is greater than 12dBi.
5. circular polarised array antenna that is used for RFID vehicle management field, it is characterized in that: this antenna can be used for RFID vehicle management field, its circular polarization characteristics can all have good Polarization match with linear polarization electronic license plate and circular polarization electronic license plate, and can distinguish vehicle RFID electronic license plate well.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910046195A CN101807749A (en) | 2009-02-13 | 2009-02-13 | Circularly polarized array antenna for RFID (Radio Frequency Identification) vehicle management field |
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| CN200910046195A CN101807749A (en) | 2009-02-13 | 2009-02-13 | Circularly polarized array antenna for RFID (Radio Frequency Identification) vehicle management field |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102567775A (en) * | 2010-12-24 | 2012-07-11 | 刘智佳 | UHF_RFID (Ultra High Frequency-Radio Frequency Identification) tag of multi-dielectric structure and antenna |
| CN103384031A (en) * | 2012-05-03 | 2013-11-06 | 西门子公司 | Rfid reader antenna array structure and rfid reader |
| CN103474764A (en) * | 2013-08-29 | 2013-12-25 | 成都九洲电子信息系统股份有限公司 | RFID (Radio Frequency Identification) high-gain circularly polarized microstrip antenna array |
| CN104103906A (en) * | 2014-08-01 | 2014-10-15 | 东南大学 | Low-cost microwave- and millimeter-wave polarized antenna of multi-layer PCB (Printed circuit board) process |
| CN104167826A (en) * | 2014-07-07 | 2014-11-26 | 浙江大学 | Linear polarized incident electromagnetic wave perfect reception wireless energy flat |
| CN106785331A (en) * | 2016-11-16 | 2017-05-31 | 刘启达 | It is applied to the intelligent counter system of the linear polarization near field antenna of gold and jewelry industry |
| WO2019041180A1 (en) * | 2017-08-30 | 2019-03-07 | Star Systems International Limited | An antenna for use in electronic communication systems |
| CN109845035A (en) * | 2016-10-14 | 2019-06-04 | 松下知识产权经营株式会社 | Antenna, wireless base station apparatus and position measuring system |
| CN110970740A (en) * | 2018-09-29 | 2020-04-07 | 启碁科技股份有限公司 | Antenna system |
-
2009
- 2009-02-13 CN CN200910046195A patent/CN101807749A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102567775B (en) * | 2010-12-24 | 2016-06-08 | 上海曜传信息科技有限公司 | The UHF_RFID label of a kind of multimedium structure and antenna |
| CN102567775A (en) * | 2010-12-24 | 2012-07-11 | 刘智佳 | UHF_RFID (Ultra High Frequency-Radio Frequency Identification) tag of multi-dielectric structure and antenna |
| CN103384031A (en) * | 2012-05-03 | 2013-11-06 | 西门子公司 | Rfid reader antenna array structure and rfid reader |
| CN103474764A (en) * | 2013-08-29 | 2013-12-25 | 成都九洲电子信息系统股份有限公司 | RFID (Radio Frequency Identification) high-gain circularly polarized microstrip antenna array |
| CN103474764B (en) * | 2013-08-29 | 2016-03-02 | 成都九洲电子信息系统股份有限公司 | RFID high-gain circular polarization microstrip antenna array |
| CN104167826A (en) * | 2014-07-07 | 2014-11-26 | 浙江大学 | Linear polarized incident electromagnetic wave perfect reception wireless energy flat |
| CN104103906A (en) * | 2014-08-01 | 2014-10-15 | 东南大学 | Low-cost microwave- and millimeter-wave polarized antenna of multi-layer PCB (Printed circuit board) process |
| CN109845035A (en) * | 2016-10-14 | 2019-06-04 | 松下知识产权经营株式会社 | Antenna, wireless base station apparatus and position measuring system |
| CN106785331A (en) * | 2016-11-16 | 2017-05-31 | 刘启达 | It is applied to the intelligent counter system of the linear polarization near field antenna of gold and jewelry industry |
| CN106785331B (en) * | 2016-11-16 | 2019-03-19 | 刘启达 | The intelligent counter system of linear polarization near field antenna applied to gold and jewelry industry |
| WO2019041180A1 (en) * | 2017-08-30 | 2019-03-07 | Star Systems International Limited | An antenna for use in electronic communication systems |
| US10862220B2 (en) | 2017-08-30 | 2020-12-08 | Star Systems International Limited | Antenna for use in electronic communication systems |
| CN110970740A (en) * | 2018-09-29 | 2020-04-07 | 启碁科技股份有限公司 | Antenna system |
| CN110970740B (en) * | 2018-09-29 | 2021-04-13 | 启碁科技股份有限公司 | Antenna system |
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Application publication date: 20100818 |