CN101807739A - Miniaturized and circularly polarized antenna for RFID (Radio Frequency Identification) management field - Google Patents
Miniaturized and circularly polarized antenna for RFID (Radio Frequency Identification) management field Download PDFInfo
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- CN101807739A CN101807739A CN200910046196A CN200910046196A CN101807739A CN 101807739 A CN101807739 A CN 101807739A CN 200910046196 A CN200910046196 A CN 200910046196A CN 200910046196 A CN200910046196 A CN 200910046196A CN 101807739 A CN101807739 A CN 101807739A
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Abstract
The invention belongs to the field of wireless communication, in particular to a miniaturized and circularly polarized antenna for the RFID (Radio Frequency Identification) management field. When RFID is applied to managing materials in a movable container, requiring that RFID hardware devices in the container are miniaturized on the one hand, and an RFID reader has the characteristics of high efficiency and non-blind area for the read-write performance of the attached label of a managed material on the other hand. An antenna is used as receiving and transmitting terminal equipment of the RFID reader, thereby the performance indexes of the antenna are dominant factors for influencing the RFID reading-writing performance. Therefore, the miniaturized and circularly polarized antenna for the RFID material management in the movable container is designed in the invention, and the purpose of effectively managing movable material labels by an RFID system is realized.
Description
Technical field
The invention belongs to field of wireless communication, specifically is miniaturization, the circular polarized antenna in a kind of RFID of being used for technical 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 " mass transit card " that use in the numerous cities of China, much all built-in RFID chip, also implanted RFID chip in the hundreds of millions of resident identification card of China, it is false proof that Beijing Olympic Games admission ticket in 2008 also adopts the RFID technology to carry out.In logistics field, be that the container automatic recognition system of core has become main flow gradually with RFID, logistics links such as RFID storage abroad, dispensing have obtained successful Application especially.At field of traffic, 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.Aspects such as China's fire-fighting equipment management, police equipment management, safe coal management, urban public utilities management, medical control, agricultural product management also begin 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.Yet, in rfid system, particularly in the middle of storehouse management and logistics management, managed goods and materials and often be placed on the storehouse management sales counter or in the mobile chest, this just requires rfid system to have the miniaturization effect; On the other hand, often placed irregular, the general single antenna of RFID antenna employing in orientation by the management goods and materials, and The Research of Antenna Polarization is single, beam coverage is narrow, and the goods and materials label that often can not satisfy all irregular placements carries out non-blind area management and control and Region control management.To be distinguished by the label of management and control goods and materials all, carry out intelligent management, necessarily require the polarization and the label compatibility of used antenna, antenna beam can cover by management and control goods and materials space simultaneously, and don't disturbing other regional space, the realization rfid interrogator is managed being distinguished with Region control by the non-blind area of management and control goods and materials.
Summary of the invention
The objective of the invention is to satisfy the requirement to the RFID antenna miniaturization in removable container of existing RFID technology, overcome simultaneously defective that can not entirely accurate recognition by management goods and materials label, the antenna element of the circular polarization MIMO antenna system in a kind of RFID of can be used for technical management field is provided.The English multiple-input and multiple-output by name of Multi Input MultiOutput (MIMO), be transmitting terminal and the receiving terminal in wireless telecommunications, use a plurality of transmitting antennas and reception antenna respectively, utilize the MIMO technology can improve the capacity of channel, also can improve simultaneously the reliability of channel, reduce the error rate.The antenna element of the present invention's design can be applied to RFID circular polarization MIMO antenna system, has the characteristics of miniaturization and circular polarization, can realize in the removable container to the RFID antenna miniaturization with to being managed by the non-blind area of management and control goods and materials.
The present invention is achieved by the following technical solutions, the present invention includes: radiating element (1), dielectric-slab (2), ground plate (3), air gap (4), coaxial feed terminal (5).Radiating element (1) structure is square circulus, and has phase adjusted factor b and c, and coaxial feed terminal (5) is positioned at the mid point of the intersection of phase adjusted factor b and c.Radiating element (1) material is a metal film, is plated on the dielectric-slab (2) by printed circuit technique, and coaxial feed terminal (5) passes ground plate (3), air gap (4) and dielectric-slab (2) and is connected with radiating element (1).
The present invention includes: radiating element (1), dielectric-slab (2), ground plate (3), air gap (4), coaxial feed terminal (5).Radiating element (1) is by coaxial feed terminal (5) feed, and the effect by phase adjusted factor b and c, the phase phasic difference of the company's of excitation quadrature is the ripple of 90 degree patterns, and forms circularly polarised wave in the space, realizes that antenna has circular polarization characteristics in working frequency range.Dielectric-slab (2) is a high frequency laminate, and dielectric Changshu is 10.2, and in conjunction with the square circulus of air gap (4) and radiating element (1), realizes the miniaturization and the broadband characteristics of antenna.
Described miniaturization, circular polarized antenna have miniaturization, broadband and circular polarization characteristics.Miniaturization, circular polarized antenna are 900MHz-941MHz in return loss less than the bandwidth of 10dB, and axial ratio is less than 1 in operating frequency is 920MHz-925MHz for miniaturization, circular polarized antenna, and gain is greater than 6dBi.Described miniaturization, circular polarized antenna can be used as the antenna element of RFID circular polarization MIMO antenna system, have the characteristics of miniaturization and circular polarization, can realize in the removable container to the RFID antenna miniaturization with to being managed by the non-blind area of management and control goods and materials.
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 antenna structure with miniaturization, broadband, circular polarization, this scheme is applied to RFID technical management field, can be used as the antenna element of RFID circular polarization MIMO antenna system, characteristics with miniaturization, broadband and circular polarization can realize in the removable container to the RFID antenna miniaturization with to being managed by the non-blind area of management and control goods and materials.
Description of drawings
Fig. 1 is miniaturization, circular polarized antenna front and the construction profile of a kind of RFID of being used for management domain of the present invention.
Fig. 2 is the return loss schematic diagram of miniaturization of the present invention, circular polarized antenna.
Fig. 3 is the axial ratio and the gain schematic diagram of miniaturization of the present invention, circular polarized antenna
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: radiating element 1, dielectric-slab 2, ground plate 3, air gap 4, coaxial feed terminal 5.Connected mode is: radiating element 1 is printed on the dielectric-slab 2 by printed circuit technique, and coaxial feed terminal 5 passes ground plate 3, air gap 4 and dielectric-slab 2 and is connected with radiating element 1.
As shown in Figure 1, miniaturization, circular polarized antenna are the microstrip antennas of multilayer, and the ground floor medium is a dielectric-slab 2, and dielectric-slab 2 sizes are 134mm * 134mm * 3mm, and dielectric-slab 2 is foursquare constant low-loss high frequency plate of material, and dielectric Changshu is 10.2.Second layer medium is air gap 4, and thickness is 14mm.It below the air gap 4 metal ground plate 3.Radiating element 1 structure is square circulus, and has phase adjusted factor b and c, and coaxial feed terminal 5 is positioned at the mid point of the intersection of phase adjusted factor b and c, and coaxial feed terminal 5 is 50 ohm of radio-frequency (RF) coaxial joints of standard.Radiating element 1 passes through coaxial feed terminal 5 feeds, and passes through the effect of phase adjusted factor b and c, and two phase phasic differences that encouraged quadrature are the ripple of 90 degree patterns, and forms circularly polarised wave in the space, realizes the circular polarization characteristics of antenna in working frequency range.Dielectric-slab 2 is realized the miniaturization and the broadband character of antenna in conjunction with the square circulus of air gap 4 and radiating element 1.
The return loss of middle-size and small-sizeization of Fig. 2, circular polarized antenna shows: circular polarized antenna is 900MHz-941MHz at the absolute bandwidth of return loss during less than-10dB.
Fig. 3 shows miniaturization, circular polarized antenna, and axial ratio is less than 1 in operating frequency is 920MHz-925MHz, and gain is greater than 6dBi.
A kind of miniaturization of RFID management domain, course of work of circular polarized antenna of being used for of present embodiment: radio frequency source is given radiating element 1 feed by coaxial feed terminal 5, radiating element 1 has phase adjusted factor b and c, the phase phasic difference that has encouraged two quadratures is the mode wave of 90 degree, and at space formation circularly polarised wave, realize circular polarization characteristics, the broadband character of getting back simultaneously.Miniaturization of the present invention, circular polarized antenna can be used as the antenna element of RFID circular polarization MIMO antenna system, under the selection control of radio frequency link switch, the beam area of antenna can cover by the placement space of management goods and materials, and can form good Polarization match with general linear polarization label, realization RFID technology is carried out non-blind area identification to goods and materials in the removable container purpose.
Claims (5)
1. miniaturization, circular polarized antenna that is used for the RFID management domain, comprise: radiating element (1), dielectric-slab (2), ground plate (3), air gap (4), coaxial feed terminal (5), it is characterized in that: radiating element (1) structure is square circulus, and have phase adjusted factor b and a c, radiating element (1) material is a metal film, be printed on the dielectric-slab (2) by printed circuit technique, coaxial feed terminal (5) passes ground plate (3), air gap (4) and dielectric-slab (2) and is connected with radiating element (1).
2. miniaturization, circular polarized antenna that is used for the RFID management domain, it is characterized in that: coaxial feed terminal (5) is positioned at the mid point of the intersection of phase adjusted factor b and c, radiating element (1) is by coaxial feed terminal (5) feed, and the effect by phase adjusted factor b and c, the phase phasic difference that has encouraged two quadratures is the ripple of 90 degree patterns, and, make antenna in working frequency range, have circular polarization characteristics at space formation circularly polarised wave.
3. miniaturization, circular polarized antenna that is used for the RFID management domain, it is characterized in that: dielectric-slab (2) is a high frequency laminate, dielectric Changshu is 10.2, and in conjunction with the square circulus of air gap (4) and radiating element (1), makes antenna have miniaturization and broadband effect.
4. miniaturization, circular polarized antenna that is used for the RFID management domain, it is characterized in that: antenna is operated in uhf band and has miniaturization, broadband and circular polarization characteristics, antenna is 900MHz-941MHz 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 6dBi.
5. miniaturization, circular polarized antenna that is used for the RFID management domain, it is characterized in that: this antenna can be used as the unit of RFID circular polarization MIMO antenna system, under the selection control of radio frequency link switch, the beam area of antenna can cover by the placement space of management goods and materials, and can form good Polarization match with general linear polarization label, realization RFID technology is carried out non-blind area identification to goods and materials in the removable container purpose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910046196A CN101807739A (en) | 2009-02-13 | 2009-02-13 | Miniaturized and circularly polarized antenna for RFID (Radio Frequency Identification) management field |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910046196A CN101807739A (en) | 2009-02-13 | 2009-02-13 | Miniaturized and circularly polarized antenna for RFID (Radio Frequency Identification) management field |
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| CN101807739A true CN101807739A (en) | 2010-08-18 |
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Cited By (7)
| 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 |
| CN102637963A (en) * | 2012-03-28 | 2012-08-15 | 中国联合网络通信集团有限公司 | Indoor distributed antenna system and multiple input multiple output method |
| CN103959557A (en) * | 2011-11-04 | 2014-07-30 | 凯瑟雷恩工厂两合公司 | Patch radiator |
| CN106910993A (en) * | 2017-03-14 | 2017-06-30 | 南通大学 | A kind of frequency-adjustable micro-strip paster antenna of microfluidic control |
| CN107634333A (en) * | 2017-09-22 | 2018-01-26 | 北京邮电大学 | A UHF radio frequency identification anti-metal circular polarisation label antenna |
| CN108511901A (en) * | 2018-04-09 | 2018-09-07 | 重庆邮电大学 | A kind of easily matched circular polarisation UHF RFID reader antennas of impedance |
| WO2022095866A1 (en) * | 2020-11-04 | 2022-05-12 | 蓬托森思股份有限公司 | Substrate-integrated circularly polarized electromagnetic radiation structure and array |
-
2009
- 2009-02-13 CN CN200910046196A patent/CN101807739A/en active Pending
Cited By (11)
| 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 |
| 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 |
| CN103959557A (en) * | 2011-11-04 | 2014-07-30 | 凯瑟雷恩工厂两合公司 | Patch radiator |
| JP2014534761A (en) * | 2011-11-04 | 2014-12-18 | カトライン−ベルケ・カーゲー | Patch radiator |
| CN103959557B (en) * | 2011-11-04 | 2016-12-14 | 凯瑟雷恩工厂两合公司 | Patch radiator |
| US9647328B2 (en) | 2011-11-04 | 2017-05-09 | Kathrein-Werke Kg | Patch radiator |
| CN102637963A (en) * | 2012-03-28 | 2012-08-15 | 中国联合网络通信集团有限公司 | Indoor distributed antenna system and multiple input multiple output method |
| CN106910993A (en) * | 2017-03-14 | 2017-06-30 | 南通大学 | A kind of frequency-adjustable micro-strip paster antenna of microfluidic control |
| CN107634333A (en) * | 2017-09-22 | 2018-01-26 | 北京邮电大学 | A UHF radio frequency identification anti-metal circular polarisation label antenna |
| CN108511901A (en) * | 2018-04-09 | 2018-09-07 | 重庆邮电大学 | A kind of easily matched circular polarisation UHF RFID reader antennas of impedance |
| WO2022095866A1 (en) * | 2020-11-04 | 2022-05-12 | 蓬托森思股份有限公司 | Substrate-integrated circularly polarized electromagnetic radiation structure and array |
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Application publication date: 20100818 |