CN102496776A - 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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- CN102496776A CN102496776A CN2011104064687A CN201110406468A CN102496776A CN 102496776 A CN102496776 A CN 102496776A CN 2011104064687 A CN2011104064687 A CN 2011104064687A CN 201110406468 A CN201110406468 A CN 201110406468A CN 102496776 A CN102496776 A CN 102496776A
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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 the wireless communication technology field, particularly be 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 come a kind of technology of automatic recognition object.Rfid system generally is made up of electronic tag (comprising chip and label antenna), reader and computer etc.Current, radio frequency identification operating frequency commonly used has low frequency frequency range (125KHz, 134KHz), high-frequency band (13.56MHz), hyperfrequency (UHF) section, and (840～960MHz) with the above microwave frequency band of 2.45GHz etc.Hyper band and microwave frequency band are applied in fields such as Car park payment, logistics, public transport and automotive safety antitheft owing to have advantages such as operating distance is far away, communication speed is fast, size is little 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 is used for globalization of REID and has caused certain difficulty.Design a kind of label antenna that can cover countries in the world UHF RFID frequency range, it is very important using for the globalization of RFID technology.For example, along with Logistics Development RFID label is usually used in the automatic identification of goods.To make goods by identification easily in the world, just necessarily require the RFID label can be operated in the very wide frequency band, thereby guarantee that the information in the label can correctly be identified all over the world.
In order to realize letting label antenna be operated in global this target of UHF RFID frequency range 840MHz～960MHz, many in recent years experts and scholars study the broadband ultra-high frequency antenna.For example; Son; H.W. and Pyo, C.S. proposes the bandwidth of coming the broadening label antenna with inductance coupling structure in document " Design of RFID tag antennas using an inductively coupled feed ", but the bigger (80mm * 17.2mm) of their given antenna size; C.C.Chang and Y.C.Lo propose the bandwidth of coming the broadening label antenna with capacitive coupling structure in document " Broadband RFID tag antenna with capacitively coupled structure "; Antenna structure is simple; But bandwidth is narrow, and 65MHz is only arranged; Cho C.; Choo H. and Park I. realize the broadband label antenna at document " Broadband RFID tag antenna with quasi-isotropic radiation pattern " through regulating double-T shaped matching network; Available bandwidth but does not also have complete UHF RFID frequency range covering the whole world from 848MHz to 926MHz; Document " UHF RFID tag antenna with broadband characteristic " is though 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 the big (106mm * 44mm) of antenna size; (application number: 200810029161.8) proposed a kind of radiating principal is two broad band uhf RFID electronic label antennas that all have T groove part crack radiation copper sheet to patent of invention " the broad band uhf RFID electronic label antennas under many applied environments "; This antenna substrate is three-decker, complex structure, and the frequency band that can cover is merely 866MHz～928MHz.
Therefore designing a kind of broadband miniaturization label antenna that can be operated in ultrahigh-frequency radio-frequency identification system is crucial for the application and the development of REID.
Summary of the invention
Goal of the invention:, the purpose of this invention is to provide the label antenna and the electronic tag of a kind of ability UHF RFID covering the whole world frequency range to the problem and shortage of above-mentioned existing existence.
Technical scheme: for realizing the foregoing invention purpose; The technical scheme that the present invention adopts 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; Said interconnective split ring resonator comprises small orifices resonant ring and large scale split ring resonator, and said 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.Through 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 big trough.This interconnective split ring resonator is widened the label antenna operating frequency range to reaching, the purpose of structure small sized wide-band label antenna.
Said inductance coupling high is guided line parallel in large scale split ring resonator opening part, is to be used for obtaining better aerial radiation characteristic, and its size adopts simulation software optimization to obtain.
Said all standing label antenna is metal material (as: copper, aluminium, a silver), and is printed on (as: FR4 epoxy resin base plate, polytetrafluoroethylene material) on the dielectric substrate.
The another kind of technical scheme that the present invention adopts is a kind of electronic tag, comprises the label antenna of aforesaid UHF RFID frequency range covering the whole world, also comprises the label chip that is positioned at said small orifices resonant ring opening part.
The principle that the present invention uses is:
In electromagnetism engineering field, ultra material usually is used for reducing the size of microwave device.(Split Ring Resonator is a kind of elementary cell that makes up ultra material SRR) to split ring resonator, and it has been used in the design of many microwave devices such as antenna etc.In microwave band, because the metal resonant ring has inductance L and resistance R, opening part shows capacitor C, and whole split ring resonator can equivalence be the resonant circuit of an electric capacity, inductance and resistance series connection.And the conductivity of metal is very big, and resistance very I is ignored, and split ring resonator can be regarded the LC resonator under the impressed field induction as.Split ring resonator has sub-wavelength resonance characteristics, 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.
Use above-mentioned principle; Split ring resonator with two appearance not of uniform size interconnects in the present invention; Thereby the resonance frequency of adjoining large scale SRR through the dimensionally-optimised resonance frequency that lets small size SRR; Right through this interconnective SRR, reach the purpose of widening label antenna operating frequency range, structure small sized wide-band label antenna.
Beneficial effect: the present invention uses the sub-wavelength resonance characteristics of the split ring resonator in the meta-materials; The interconnected split ring resonator that makes up a pair of different size is to radiating element; It is guided line into an inductance coupling high and constitutes a kind of miniaturization broadband radio-frequency label antenna together; The opening part and this label antenna that label chip are added in the small orifices resonant ring constitute the small sized wide-band radio electronic label together.
The working band of label antenna in voltage standing wave ratio VSWR＜1.22 of the present invention UHF RFID covering the whole world frequency range reaches 170MHz (790MHz-960MHz), covered all uhf bands in the whole world.
Compared with existing most of broadband UHF label antennas, has littler size.
The all standing label antenna adopts the single sided board structure, can realize through typography, have simple in structure, volume is little, the advantage that is easy to make.
Actual measurement shows all standing label antenna then approximate omnidirectional radiation on the H face, can satisfy the demand that in practical application requirement can be read electronic labeling information from all directions, and being fit to closely, RFID uses.
Electronic tag when show adopting the electronic tag of this all standing label antenna to be attached to the different materials surface, actual measurement can both read, even still can be identified when being attached on the metal surface.
Description of drawings
Fig. 1 is the structural representation of the electronic tag of employing 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 the antenna pattern of all standing label antenna at E face and H face;
Fig. 5 reads range direction figure for electronic tag.
Label among 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 accompanying drawing and specific embodiment; Further illustrate the present invention; Should understand these embodiment only be used to the present invention is described and be not used in the restriction scope of the present invention; After having read the present invention, those skilled in the art all fall within the application's accompanying claims institute restricted portion to the modification of the various equivalent form of values of the present invention.
Following antenna size and performance only are to the result after optimizing under the RI-UHF-STRAP-08 label chip condition that adopts FR4 epoxy resin base plate and Ti company; If adopt other substrate and chip, carry out also obtaining after the optimization on the size based on the principle of the invention and structure.
As shown in Figure 1; The all standing label antenna is printed on the dielectric substrate (not shown); It is the FR4 epoxy resin base plate (ε r=4.4, tan δ=0.002) of 1.5mm that the dielectric substrate adopts thickness), through the antenna size of optimal design be: the length L 3 that inductance coupling high is guided line 1 into is respectively 19.03mm, 2mm with width A3; 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 Ti company is connected the opening part of small orifices resonant ring, and all standing label antenna constitutes radio electronic label with label chip.Label antenna overall dimensions of the present invention is 40.32mm * 25.23mm, has littler size compared with most of similar broadbands label antenna, and is as shown in table 1.
Table 1 UHF broadband label antenna relatively
Fig. 2 has provided all standing label antenna standing wave ratio of input voltage that emulation obtains, and all standing label antenna compares all less than 1.22 at 790-960MHz scope standing internal wave.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 used label chip impedance be conjugate impedance match (impedance of chip when 915MHz is 9.9-j60.53 ohm) basically.Simultaneously slow in the variation of pays close attention to frequency range internal impedance, thus help to be implemented in global UHF RFID frequency range (lower antenna standing wave ratio of input voltage and good aerial radiation characteristic in the 840MHz～960MHz).
Fig. 4 has provided the radiation pattern simulation result.The result demonstrates all standing label antenna shows typical dipole antenna at the E face radiation characteristic; Then approximate omnidirectional radiation on the H face can satisfy the demand that in practical application requirement can be read electronic labeling information from all directions.
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 the space.In the E face, to read apart from difference, but in the H face, read distance with azimuthal irrelevant basically with azimuthal difference, its result and emulation obtain radiation pattern basically identical as a result.It is not only relevant with antenna azimuth to read distance, but also relevant with the residing background material of label, and label still can be identified when the actual measurement proof was attached on the metal surface.
Claims (3)
1. the label antenna of a 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.Said interconnective split ring resonator comprises small orifices resonant ring and large scale split ring resonator.Said inductance coupling high is guided line parallel in large scale split ring resonator opening part.
2. according to the label antenna of the said UHF RFID frequency range covering the whole world of claim 1, it is characterized in that: the resonance frequency of said small orifices resonant ring and large scale split ring resonator is contiguous.
3. electronic tag comprises the label antenna of UHF RFID frequency range covering the whole world according to claim 1 or claim 2 also comprising the label chip that is positioned at said small orifices resonant ring opening part.
Priority Applications (1)
| 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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| CN102496776B CN102496776B (en) | 2014-01-22 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103366217A (en) * | 2013-06-18 | 2013-10-23 | 陈昊 | High-sensitivity ultrahigh-frequency radio frequency identification electronic tag for transportation industry |
| CN103594795A (en) * | 2013-11-21 | 2014-02-19 | 天津中兴智联科技有限公司 | RFID label antenna |
| CN103612824A (en) * | 2013-11-21 | 2014-03-05 | 高洪强 | Plastic UHF (ultra-high frequency)-RFID (radio frequency identification) bottle cap |
| CN103617443A (en) * | 2013-11-19 | 2014-03-05 | 李强 | Subminiature UHF RFID electronic tag |
| CN105514621A (en) * | 2016-02-16 | 2016-04-20 | 南京师范大学 | Near-field segmented line 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 |
| CN109921193A (en) * | 2019-03-14 | 2019-06-21 | 南京邮电大学 | Bimodal class electromagnetically induced transparent unit and method based on two kinds of coupled modes |
| CN110263592A (en) * | 2019-06-21 | 2019-09-20 | 中国神华能源股份有限公司 | Rolling stock information readout device, method and rolling stock detection system, method |
| CN112204816A (en) * | 2018-04-27 | 2021-01-08 | 日本航空电子工业株式会社 | Conductor, antenna and communication device |
| CN112216989A (en) * | 2020-09-02 | 2021-01-12 | 珠海格力电器股份有限公司 | Ultra-wideband WIFI microstrip antenna, amplification method and small WIFI equipment |
| CN113270719A (en) * | 2021-04-01 | 2021-08-17 | 武汉虹信科技发展有限责任公司 | Antenna isolation device, array antenna and base station antenna |
| US11916317B2 (en) * | 2021-07-30 | 2024-02-27 | Japan Aviation Electronics Industry, Limited | RFID tag and antenna member for use in RFID tag |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103594795A (en) * | 2013-11-21 | 2014-02-19 | 天津中兴智联科技有限公司 | RFID label antenna |
| CN103612824A (en) * | 2013-11-21 | 2014-03-05 | 高洪强 | Plastic UHF (ultra-high frequency)-RFID (radio frequency identification) bottle cap |
| CN105514621B (en) * | 2016-02-16 | 2018-02-09 | 南京师范大学 | Near field is segmented linear array antenna |
| CN105514621A (en) * | 2016-02-16 | 2016-04-20 | 南京师范大学 | Near-field segmented line array antenna |
| WO2019080340A1 (en) * | 2017-10-23 | 2019-05-02 | 上扬无线射频科技扬州有限公司 | Aluminum etching antenna with uhf tag near-field test function |
| 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 |
| CN112204816A (en) * | 2018-04-27 | 2021-01-08 | 日本航空电子工业株式会社 | Conductor, antenna and communication device |
| CN112204816B (en) * | 2018-04-27 | 2023-09-05 | 日本航空电子工业株式会社 | Conductor, antenna and communication device |
| CN109921193A (en) * | 2019-03-14 | 2019-06-21 | 南京邮电大学 | Bimodal class electromagnetically induced transparent unit and method based on two kinds of coupled modes |
| CN110263592A (en) * | 2019-06-21 | 2019-09-20 | 中国神华能源股份有限公司 | Rolling stock information readout device, method and rolling stock detection system, method |
| CN112216989A (en) * | 2020-09-02 | 2021-01-12 | 珠海格力电器股份有限公司 | Ultra-wideband WIFI microstrip antenna, amplification method and small WIFI equipment |
| CN113270719A (en) * | 2021-04-01 | 2021-08-17 | 武汉虹信科技发展有限责任公司 | Antenna isolation device, array antenna and base station antenna |
| US11916317B2 (en) * | 2021-07-30 | 2024-02-27 | Japan Aviation Electronics Industry, Limited | RFID tag and antenna member for use in RFID tag |
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