CN102496776B - Tag antenna capable of covering global UHF RFID frequency ranges, electronic tag - Google Patents
Tag antenna capable of covering global UHF RFID frequency ranges, electronic tag Download PDFInfo
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- CN102496776B CN102496776B CN201110406468.7A CN201110406468A CN102496776B CN 102496776 B CN102496776 B CN 102496776B CN 201110406468 A CN201110406468 A CN 201110406468A CN 102496776 B CN102496776 B CN 102496776B
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- electronic tag
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- label
- split ring
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Abstract
The invention discloses a tag antenna capable of covering global UHF (Ultra High Frequency) RFID (Radio Frequency Identification) frequency ranges. The tag antenna comprises a pair of interconnected split resonant rings and an inductive coupling guide line. The interconnected split resonant rings include a small split resonant ring and a big split resonant ring. The inductive coupling guide line is parallel to the opening part of the big split resonant ring. The invention further discloses an electronic tag. The tag antenna of the invention can cover the global UHF RFID frequency ranges, in comparison with most broad-band antennae of the same type, the tag antenna has smaller size and broader bandwidth, and simultaneously, the tag antenna is simply structured and convenient to produce. The test result of the practically produced electronic tag shows that the electronic tag can be used on surfaces of objects made of different materials (including metals), the reading-writing distance of the electronic tag can meet the requirement of reading electronic tag information all around, and the electronic tag is suitable for close-range RFID application.
Description
Technical field
The present invention relates to broadband miniaturization ultra-high frequency antenna and electronic tag in wireless communication technology field, be particularly operated in broadband miniaturization label antenna and electronic tag in hyperfrequency (UHF) radio-frequency recognition system.
Background technology
Radio frequency identification (RFID) technology is to utilize radiofrequency signal to carry out a kind of technology of automatic recognition object.Rfid system is generally comprised of electronic tag (comprising chip and label antenna), reader and computer etc.Current, the conventional operating frequency of radio-frequency (RF) identification has low frequency frequency range (125KHz, 134KHz), high-frequency band (13.56MHz), hyperfrequency (UHF) section (840～960MHz) and microwave frequency band more than 2.45GHz etc.Hyper band and microwave frequency band, owing to having the advantages such as operating distance is far away, communication speed is fast, size is little, are applied in fields such as Car park payment, logistics, public transport and automobile safety anti-thefts gradually.
Whole world various countries are different to the regulation of UHF RFID working frequency range, for example 840MHz～845MHz (China), 920MHz～925MHz (China), 868MHz～870MHz (Europe), 902MHz～928MHz (North America and South America), 952MHz～954MHz (Japan), this has caused certain difficulty to globalization application of REID.Design a kind of label antenna that can cover countries in the world UHF RFID frequency range, it is very important for the globalization of RFID technology, applying.For example, the development RFID label along with logistics is usually used in the automatic identification of goods.Will make in the world goods be readily identified, just necessarily require RFID label can be operated in a very wide frequency band, thereby the information in label that guarantees can be correctly identified out all over the world.
In order to realize, allow label antenna be operated in global this target of UHF RFID frequency range 840MHz～960MHz, many experts and scholars are studied broadband ultra-high frequency antenna in recent years.For example, Son, H.W. and Pyo, C.S. in document " Design of RFID tag antennas using an inductively coupled feed ", propose to come with inductance coupling structure the bandwidth of broadening label antenna, but their given antenna size larger (80mm * 17.2mm); C.C.Chang and Y.C.Lo propose to come with capacitive coupling structure the bandwidth of broadening label antenna in document " Broadband RFID tag antenna with capacitively coupled structure ", antenna structure is simple, but bandwidth is narrow, only there is 65MHz; Cho C., Choo H. and Park I. at document " Broadband RFID tag antenna with quasi-isotropic radiation pattern " by regulating double-T shaped matching network to realize broadband tag antenna, available bandwidth, from 848MHz to 926MHz, but does not also have complete UHF RFID frequency range covering the whole world; Document " UHF RFID tag antenna with broadband characteristic " is although the antenna that middle Xu L., Hu B.J. and Wang J. propose has covered UHF RFID frequency range, but need multilayer dielectricity plate, complex structure, and antenna size large (106mm * 44mm); Patent of invention " the broad band uhf RFID electronic label antennas under many applied environments " (application number: 200810029161.8) proposed a kind of radiating principal be two all with the broad band uhf RFID electronic label antenna of T-shaped gap radiation copper sheet, this antenna substrate is three-decker, complex structure, and the frequency band that can cover is only 866MHz～928MHz.
Therefore designing a kind of broadband miniaturization label antenna that can be operated in ultrahigh-frequency radio-frequency identification system is very important for the application of REID with development.
Summary of the invention
Goal of the invention: for the problem and shortage of above-mentioned existing existence, the object of this invention is to provide label antenna and the electronic tag of a kind of energy UHF RFID covering the whole world frequency range.
Technical scheme: for achieving the above object, the technical solution used in the present invention is a kind of label antenna (being called for short " all standing label antenna ") of UHF RFID frequency range covering the whole world, comprise that a pair of interconnective split ring resonator and an inductance coupling high guide line into, described interconnective split ring resonator comprises small orifices resonant ring and large scale split ring resonator, and described inductance coupling high is guided line parallel in large scale split ring resonator opening part.
The size of split ring resonator adopts simulation software optimization to obtain.After dimensionally-optimised, the resonance frequency of the resonance frequency of small orifices resonant ring and large scale split ring resonator is contiguous, the frequency characteristic that shows as the voltage standing wave ratio of antenna input is to cover small orifices resonant ring and each self-resonance frequency of large scale split ring resonator, forms large trough.This interconnective split ring resonator is widened label antenna operating frequency range to reaching, the object of structure small sized wide-band label antenna.
Described inductance coupling high is guided line parallel in large scale split ring resonator opening part, is for obtaining better antenna radiation characteristics, and its size adopts simulation software optimization to obtain.
Described all standing label antenna is metal material (as: copper, aluminium, silver), and is printed on (as: FR4 epoxy resin base plate, polytetrafluoroethylene material) on dielectric substrate.
The another kind of technical scheme that the present invention adopts is a kind of electronic tag, comprises the label antenna of UHF RFID frequency range covering the whole world as above, also comprises the label chip that is positioned at described small orifices resonant ring opening part.
The principle of the present invention's application is:
In Electromagnetic Engineering field, super material is usually used for reducing the size of microwave device.Split ring resonator (Split Ring Resonator, SRR) is a kind of elementary cell that builds super material, and it has been used in many microwave devices as in the design of antenna etc.In microwave band, because metal resonant ring has inductance L and resistance R, opening part shows capacitor C, and whole split ring resonator can be equivalent to the resonant circuit of an electric capacity, inductance and resistance series connection.And the conductivity of metal is very large, resistance very I is ignored, and split ring resonator can be regarded the LC resonator under impressed field induction as.Split ring resonator has sub-wavelength resonance feature, and it has been used in the Miniaturization Design of microwave device, and resonance frequency is relevant with the concrete size of split ring resonator.
Apply above-mentioned principle, in the present invention two split ring resonators in different size are interconnected, thereby the resonance frequency of adjoining large scale SRR by the dimensionally-optimised resonance frequency that allows small size SRR, by this interconnective SRR couple, reach the object of widening label antenna operating frequency range, structure small sized wide-band label antenna.
Beneficial effect: the sub-wavelength resonance feature of the split ring resonator in the present invention's application meta-materials, build the interconnected split ring resonator of a pair of different size to radiating element, it forms a kind of miniaturization broadband radio-frequency label antenna together with guiding line into an inductance coupling high, label chip is added in to the opening part of small orifices resonant ring, forms small sized wide-band radio electronic label together with this label antenna.
The label antenna of the present invention UHF RFID covering the whole world frequency range reaches 170MHz (790MHz-960MHz) at the working band of voltage standing wave ratio VSWR < 1.22, has covered global all uhf bands.
Compared with existing most of broadband UHF label antennas, there is less size.
All standing label antenna adopts single sided board structure, by typography, can realize, have advantages of simple in structure, volume is little, be easy to manufacture.
Actual measurement shows all standing label antenna approximate omnidirectional radiation on H face, can meet requirement in actual applications can be all directions the demand of reading electronic labels information, be applicable to closely RFID application.
Actual measurement shows that the electronic tag of this all standing label antenna of employing can read while being attached to different materials surface, even electronic tag still can be identified while being attached on metal surface.
Accompanying drawing explanation
Fig. 1 is for adopting the structural representation of the electronic tag of all standing label antenna;
Fig. 2 is the frequency characteristic curve diagram of all standing label antenna voltage standing wave ratio;
Fig. 3 is the frequency characteristics of all standing label antenna input impedance;
Fig. 4 is that all standing label antenna is at the antenna pattern of E face and H face;
Fig. 5 is that electronic tag reads range direction figure.
Number in the figure: inductance coupling high is guided line-1 into, large scale split ring resonator-2, small orifices resonant ring-3, label chip-4.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment is only not used in and limits the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
Following antenna size and performance are only the results after optimizing under the RI-UHF-STRAP-08 label chip condition for employing FR4 epoxy resin base plate HeTi company, if adopt other substrate and chip, based on the principle of the invention and structure, carry out also obtaining after the optimization in size.
As shown in Figure 1, all standing label antenna is printed in dielectric substrate (not shown), dielectric substrate adopts FR4 epoxy resin base plate (the ε r=4.4 that thickness is 1.5mm, tan δ=0.002)), antenna size through optimal design is: length L 3 and width A3 that inductance coupling high is guided line 1 into are respectively 19.03mm, 2mm, inductance coupling high is guided line 1 into and is parallel to large scale split ring resonator 2 opening parts, with the spacing A2 of large scale split ring resonator be 0.43mm; Large scale split ring resonator length L 1, width W 1 and opening part length A 1 are respectively 40.32mm, 20.1mm, 2.5mm, and large scale split ring resonator live width is 3mm; Small orifices resonant ring 3 length L 2, width W 2 are respectively 9.69mm, 9.4mm, and small orifices resonant ring live width is 2mm.The RI-UHF-STRAP-08 label chip 4 of JiangTi company is connected to the opening part of small orifices resonant ring, and all standing label antenna forms radio electronic label together with label chip.Label antenna overall dimensions of the present invention is 40.32mm * 25.23mm, compared with most of similar broadbands label antenna, has less size, as shown in table 1.
The label antenna comparison of table 1 UHF broadband
Fig. 2 has provided all standing label antenna standing wave ratio of input voltage that emulation obtains, all standing label antenna at 790-960MHz scope standing internal wave than being all less than 1.22.Therefore, this all standing label antenna can be operated in all UHF RFID frequency ranges in the whole world well.
Fig. 3 is all standing label antenna input impedance real part and the imaginary part that adopts said method to obtain.Test result and HFSS software emulation result are consistent, and the input impedance of all standing label antenna and label chip impedance used be conjugate impedance match (impedance of chip when 915MHz is 9.9-j60.53 ohm) substantially.In paid close attention to frequency range internal impedance, change slowly simultaneously, thereby help realize antenna standing wave ratio of input voltage lower in global UHF RFID frequency range (840MHz～960MHz) and good antenna radiation characteristics.
Fig. 4 has provided radiation pattern simulation result.Result demonstrates all standing label antenna and at E face, shows the radiation characteristic of typical dipole antenna; Approximate omnidirectional radiation on H face, can meet requirement in actual applications can be all directions the demand of reading electronic labels information.
Fig. 5 has provided when this electronic tag is affixed on plank and to have read range direction figure at microwave dark room.The distance that reads that can see electronic tag is related with the orientation of label in space.In E face, to read apart from the difference with azimuthal difference, but in H face, read distance with azimuthal substantially irrelevant, it is basically identical that its result and emulation obtain radiation pattern result.Read distance not only relevant with antenna azimuth, but also relevant with the residing background material of label, when actual measurement proof is attached on metal surface, label still can be identified.
Claims (2)
1. a label antenna for UHF RFID frequency range covering the whole world, is characterized in that: comprise that a pair of interconnective split ring resonator and an inductance coupling high guide line into; Described interconnective split ring resonator comprises small orifices resonant ring and large scale split ring resonator; The resonance frequency of described small orifices resonant ring and large scale split ring resonator is contiguous; Described inductance coupling high is guided line parallel in large scale split ring resonator opening part.
2. an electronic tag, comprises and the label antenna of UHF RFID frequency range covering the whole world as claimed in claim 1 also comprises the label chip that is positioned at described small orifices resonant ring opening part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110406468.7A CN102496776B (en) | 2011-12-08 | 2011-12-08 | Tag antenna capable of covering global UHF RFID frequency ranges, electronic tag |
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| CN201110406468.7A CN102496776B (en) | 2011-12-08 | 2011-12-08 | Tag antenna capable of covering global UHF RFID frequency ranges, electronic tag |
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| CN102496776A CN102496776A (en) | 2012-06-13 |
| CN102496776B true CN102496776B (en) | 2014-01-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4124994A1 (en) * | 2021-07-30 | 2023-02-01 | Japan Aviation Electronics Industry, Limited | Rfid tag and antenna member for use in rfid tag |
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| CN103366217A (en) * | 2013-06-18 | 2013-10-23 | 陈昊 | High-sensitivity ultrahigh-frequency radio frequency identification electronic tag for transportation industry |
| CN103617443A (en) * | 2013-11-19 | 2014-03-05 | 李强 | Subminiature UHF RFID electronic tag |
| CN103612824A (en) * | 2013-11-21 | 2014-03-05 | 高洪强 | Plastic UHF (ultra-high frequency)-RFID (radio frequency identification) bottle cap |
| CN103594795A (en) * | 2013-11-21 | 2014-02-19 | 天津中兴智联科技有限公司 | RFID label antenna |
| CN105514621B (en) * | 2016-02-16 | 2018-02-09 | 南京师范大学 | Near field is segmented linear array antenna |
| CN107578085A (en) * | 2017-10-23 | 2018-01-12 | 上扬无线射频科技扬州有限公司 | A kind of aluminium etching antenna with UHF label near-field test functions |
| CN108550977A (en) * | 2018-03-30 | 2018-09-18 | 深圳市振华微电子有限公司 | RFID antenna, RFID tag and RFID antenna production method |
| JP7265539B2 (en) * | 2018-04-27 | 2023-04-26 | 日本航空電子工業株式会社 | Conductors, Antennas, and Communication Devices |
| CN109921193B (en) * | 2019-03-14 | 2021-06-25 | 南京邮电大学 | Double-peak electromagnetic induction transparent device and method based on two coupling modes |
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| CN112216989B (en) * | 2020-09-02 | 2022-05-13 | 珠海格力电器股份有限公司 | Ultra-wideband WIFI microstrip antenna, amplification method and small WIFI equipment |
| CN113270719B (en) * | 2021-04-01 | 2023-04-11 | 中信科移动通信技术股份有限公司 | Antenna isolation device, array antenna and base station antenna |
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| EP2110965A2 (en) * | 2008-04-17 | 2009-10-21 | Broadcom Corporation | Method and system for using a wireless local area network (WLAN) phase shifter for smart antenna beam steering |
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2011
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|---|---|---|---|---|
| US6575374B1 (en) * | 1999-10-28 | 2003-06-10 | Ask S.A. | Coupling antenna with high inductance |
| EP2110965A2 (en) * | 2008-04-17 | 2009-10-21 | Broadcom Corporation | Method and system for using a wireless local area network (WLAN) phase shifter for smart antenna beam steering |
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| Title |
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| Benjamin D.B RAATEN, Masud A.Aziz.Using meander open complementary split ring resonator particles to design a compact UHF RFID tag antenna.《IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS》.2010,1037-1040页. |
| Using meander open complementary split ring resonator particles to design a compact UHF RFID tag antenna;Benjamin D.B RAATEN, Masud A.Aziz;《IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS》;20101231;1037-1040页 * |
| 图6，图14. |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4124994A1 (en) * | 2021-07-30 | 2023-02-01 | Japan Aviation Electronics Industry, Limited | Rfid tag and antenna member for use in rfid tag |
| US20230035707A1 (en) * | 2021-07-30 | 2023-02-02 | Japan Aviation Electronics Industry, Limited | Rfid tag and antenna member for use in rfid tag |
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| CN102496776A (en) | 2012-06-13 |
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