CN102904023A - Two-sided subminiature RFID (radio frequency identification) tag antenna - Google Patents
Two-sided subminiature RFID (radio frequency identification) tag antenna Download PDFInfo
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- CN102904023A CN102904023A CN2012104055381A CN201210405538A CN102904023A CN 102904023 A CN102904023 A CN 102904023A CN 2012104055381 A CN2012104055381 A CN 2012104055381A CN 201210405538 A CN201210405538 A CN 201210405538A CN 102904023 A CN102904023 A CN 102904023A
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Abstract
The invention discloses a two-sided subminiature RFID (radio frequency identification) tag antenna, which belongs to the technical field of RFID. The tag antenna adopts a base made of a PET film (or other materials), aluminum foils (or other good conductors) are etched on the positive and negative surfaces of the base to serve as an antenna structure, wherein one structure is of a dipole-shaped structure with two arms being far shorter than the wavelength, and the other surface is of a symmetric-clip-type structure, and an RFID tag chip is connected with the two arms of the dipole-shaped structure. The tag antenna can be applied to frequency ranges such as UHF (Ultra High Frequency) or ultra short wave; when taking the typical situation that the central frequency is 915 MHz and a Monza 4 chip is used as an example, the total volume of the tag antenna with the structure provided by the invention is only 50*5*0.05 mm <3> (0.153*0.015*0.00015 lambda 3), wide working bandwidth and omnidirectivity are achieved, and the gain is -3dBi. The invention provides a method solving the miniaturization problem of the tag antenna, and is very applicable to the field of an RFID ticketing system, an access control system and the like which need miniaturized and omnidirectional tag antenna.
Description
Technical field
The present invention relates to a kind of radio frequency recognizing electronic label, especially microminiature, isotropic electronic tag.
Background technology
Radio-frequency (RF) identification (Radio Frequency Identification, be called for short RFID) technology is a kind ofly to carry out contactless bidirectional data communication by wireless radio frequency mode, thus the technology that target is identified.Radio-frequency recognition system is comprised of reader and electronic tag usually.Electronic tag is comprised of label chip and label antenna, carries out exchanges data by electromagnetic wave and read write line, has the functions such as intelligent read and coded communication.Label antenna is vital device in the rfid system, and rfid system is by label antenna emission, reception electromagnetic wave, thereby the realization reader is to the identification of electronic tag.
Radio-frequency recognition system operates mainly in low frequency, high frequency, hyperfrequency and microwave frequency band.Wherein, the radio-frequency recognition system that is operated in hyperfrequency (UHF) frequency range owing to have volume little, read distance, the message transmission rate advantages of higher is subject to extensive concern and research.At present, the ultrahigh-frequency tag antenna adopts single face bending dipole structure more, optimize bending shape by distinct methods and reach targets such as reducing volume and raising performance, but, label antenna volume based on this single face bending dipole structure is still larger, performance is also good not, needs to adopt other principle and structure further to improve.
Summary of the invention
The objective of the invention is to design a kind of New-type label antenna structure that is different from the single face bending dipole antenna, thereby realize making the further miniaturization of label antenna and have the target of superior performance.Adopt the label antenna volume of structure of the present invention extra small, and have wider bandwidth of operation and omni-directional, gain higher.The invention provides a kind of method that solves the further miniaturization issues of label antenna, be particularly suitable for needing label antenna miniaturization and isotropic field to use in RFID ticketing system, gate control system etc.
Technical scheme of the present invention is:
A kind of two-sided microminiature RFID label antenna, described label antenna is comprised of two-sided antenna structure, substrate and RFID label chip.Described two-sided antenna etch structures is in described substrate tow sides; Two arms of the dipole shape structure in described RFID label chip and the described two-sided antenna structure link to each other.
Described antenna adopts bilateral structure, is etched in respectively the substrate two sides, and one side is dipole shape structure, and another side is symmetrical clip type structure.
Length and the width of described dipole shape structure can be adjusted.
Each edge lengths and the live width of described symmetrical clip type structure can be adjusted respectively.
Described substrate adopts the PET thin-film material, but can select other material according to concrete applied environment.
Described RFID label chip adopts Monza 4, but can select other chip according to concrete applied environment.
Described RFID label chip and the position of described dipole shape structure on described substrate can be adjusted at described substrate center line.
The working frequency range of described RFID label antenna can be adjusted according to concrete applied environment.
Described two-sided antenna structure is not limited only to the RFID field, also can be used for other field of antenna.
The invention has the beneficial effects as follows:
By adopting the left-handed materials principle, a kind of novel two-sided microminiature RFID tag antenna structure has been proposed, the label antenna cumulative volume is further reduced, but also have preferably performance.Not directly electrical connection between each surface antenna structure of two-sided antenna, by the coupling delivered current, by adjusting length, the width of dipole shape structure, and each edge lengths and the live width of symmetrical clip type structure, can realize the impedance real part of label antenna and the adjustment of imaginary part, realize to increase the shared space of matching network from coupling thereby further reduced the single face bending dipole antenna.Finally, adopt the label antenna volume of structure of the present invention extra small, and have wider bandwidth of operation and omni-directional, gain higher.
Description of drawings
The present invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the structural representation of the preferred embodiment of the present invention when working in 915MHz.
Fig. 2 is the schematic diagram of the dipole shape structure (being positioned at the substrate one side) of the preferred embodiment of the present invention when working in 915MHz.
Fig. 3 is the schematic diagram of the symmetrical clip type structure (being positioned at the substrate another side) of the preferred embodiment of the present invention when working in 915MHz.
Fig. 4 is that operating frequency of the present invention is with the trend analogous diagram of open circuit minor matters 5 length variations.
Fig. 5 is the input impedance analogous diagram of the preferred embodiment of the present invention when working in 915MHz.
Fig. 6 is E face and the H side gains analogous diagram of the preferred embodiment of the present invention when working in 915MHz.
Among the figure, the 1.RFID label chip, 2. dipole shape structure, the 3.PET film substrate, 4. symmetrical clip type structure 5. is used for adjusting the open circuit minor matters of operating frequency.
Embodiment
Further specify technical scheme of the present invention below in conjunction with Figure of description and specific embodiment.
Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, be the structural representation of the preferred embodiment of a kind of two-sided microminiature RFID label antenna of the present invention.The present embodiment comprises that (what use in the present embodiment is Monza 4 chips for PET film substrate 3, RFID label chip 1, impedance when operating frequency is 915MHz is 11-j143 Ω), dipole shape structure 2, symmetrical clip type structure 4, according to different condition and demand, dipole shape structure 2 and symmetrical clip type structure 4 can adopt the good conductor processing such as aluminium foil or silver.
As shown in Figure 2, be the schematic diagram of the dipole shape structure (being positioned at the substrate one side) of the preferred embodiment of the present invention when working in 915MHz.Among the figure, RFID label chip 1 links to each other with two arms of dipole shape structure 2, all is positioned to be of a size of 50*5*0.05mm
3The one side of PET film substrate 3, wherein, RFID label chip 1 should be positioned at the center of PET film substrate 3, and the slightly broadside skew in the symmetrical clip type structure 4, thereby adjusts the feed effect.In addition, the width of increase (reducing) dipole shape structure 2 can reduce the real part of (increase) label antenna input impedance.The length that increases (reducing) dipole shape structure 2 can reduce (raising) operating frequency.
As shown in Figure 3, be the schematic diagram of the symmetrical clip type structure (being positioned at the substrate another side) of the preferred embodiment of the present invention when working in 915MHz.Among the figure, symmetrical clip type structure 4 is etched in the another side of PET film substrate 3, obtained by a clip type structure mirror image symmetry, and except a side broadside live width is the 3mm, the wide 0.5mm that is in all the other each sidelines, the dual-side distance of open circuit minor matters 5 is 0.5mm.According to the different application environment, by increasing the length of (reducing) open circuit minor matters 5, can reduce easily the operating frequency of (raising) label antenna, in the situation that only change open circuit minor matters 5 length, the adjusting range of label antenna centre frequency is 896MHz-965MHz, bandwidth of operation (10dB return loss bandwidth) is about 100MHz, can satisfy various countries uhf band RFID application standard, the label antenna operating frequency with the trend analogous diagram of open circuit minor matters 5 length variations as shown in Figure 4.The curve that solid line represents among the figure is the preferred embodiment of this patent when operating frequency is 915MHz, and the length of the minor matters 5 of opening a way this moment is 17.5mm, and the label antenna centre frequency is 915MHz, and-10dB return loss bandwidth is about 100MHz.
As shown in Figure 5, be the input impedance value of the preferred embodiment of the present invention when working in 915MHz.The input impedance real part of this preferred embodiment when 915MHz is 6.8 Ω, and imaginary part is 143.7 Ω, formed good conjugate impedance match with the 11-j143 Ω impedance of Monza 4RFID label chip.
As shown in Figure 6, be E face and the H side gains analogous diagram of the preferred embodiment of the present invention when working in 915MHz, as seen from the figure, label antenna of the present invention has good omni-directional.
Annotate: suppose that center with label antenna of the present invention is positioned over the initial point of three-dimensional cartesian coordinate system and chip and XOZ face coplanar, the long edge Z direction placement of described label antenna, then the E face of described label antenna is the XOZ face, the H face is the XOY face.
Below only be the preferred embodiments of the present invention; be not so limit claim of the present invention; every equivalent transformation that utilizes content of the present invention to do, or with the present invention directly/indirectly be used in concrete equipment or other relevant technical field, include in scope of patent protection of the present invention.
Claims (9)
1. a two-sided microminiature RFID label antenna is characterized in that, described label antenna comprises: two-sided antenna structure, substrate, RFID label chip;
Described two-sided antenna etch structures is in described substrate tow sides; Two arms of the dipole shape structure in described RFID label chip and the described two-sided antenna structure link to each other.
2. label antenna according to claim 1 is characterized in that, described antenna adopts bilateral structure, is etched in respectively the substrate two sides, and one side is dipole shape structure, and another side is symmetrical clip type structure.
3. label antenna according to claim 1 and 2 is characterized in that, length and the width of described dipole shape structure can be adjusted.
4. label antenna according to claim 1 and 2 is characterized in that, each edge lengths and the live width of described symmetrical clip type structure can be adjusted respectively.
5. label antenna according to claim 1 is characterized in that, described substrate adopts the PET thin-film material, but can select other material according to concrete applied environment.
6. label antenna according to claim 1 is characterized in that, described RFID label chip adopts Monza 4, but can select other chip according to concrete applied environment.
7. label antenna according to claim 1 is characterized in that, described RFID label chip and the position of described dipole shape structure on described substrate can be adjusted at described substrate center line.
8. label antenna according to claim 1 is characterized in that, the working frequency range of described RFID label antenna can be adjusted according to concrete applied environment.
9. label antenna according to claim 1 and 2 is characterized in that, described two-sided antenna structure is not limited only to the RFID field, also can be used for the field that other need to use antenna.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104055381A CN102904023A (en) | 2012-10-23 | 2012-10-23 | Two-sided subminiature RFID (radio frequency identification) tag antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104055381A CN102904023A (en) | 2012-10-23 | 2012-10-23 | Two-sided subminiature RFID (radio frequency identification) tag antenna |
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| CN102904023A true CN102904023A (en) | 2013-01-30 |
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| CN2012104055381A Pending CN102904023A (en) | 2012-10-23 | 2012-10-23 | Two-sided subminiature RFID (radio frequency identification) tag antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103679235A (en) * | 2013-12-20 | 2014-03-26 | 昆山信德佳电气科技有限公司 | Monitoring device and method for fixed point positioning management of articles |
| CN107658559A (en) * | 2017-10-20 | 2018-02-02 | 杭州泽济电子科技有限公司 | Miniaturization anti-metal antenna and label |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090096678A1 (en) * | 2007-10-10 | 2009-04-16 | Electronics And Telecommunications Research Institute | Antenna for radio frequency identification tag |
| US20100001079A1 (en) * | 2008-02-27 | 2010-01-07 | Tagsys Sas | Combined EAS/RFID tag |
| CN202205889U (en) * | 2011-09-06 | 2012-04-25 | 惠州硕贝德无线科技股份有限公司 | Microwave frequency band RFID (Radio Frequency Identification Device) tag antenna applied to nonmetal surface |
| CN202997055U (en) * | 2012-10-23 | 2013-06-12 | 北京邮电大学 | Double-sided subminiature RFID tag antenna |
-
2012
- 2012-10-23 CN CN2012104055381A patent/CN102904023A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090096678A1 (en) * | 2007-10-10 | 2009-04-16 | Electronics And Telecommunications Research Institute | Antenna for radio frequency identification tag |
| US20100001079A1 (en) * | 2008-02-27 | 2010-01-07 | Tagsys Sas | Combined EAS/RFID tag |
| CN202205889U (en) * | 2011-09-06 | 2012-04-25 | 惠州硕贝德无线科技股份有限公司 | Microwave frequency band RFID (Radio Frequency Identification Device) tag antenna applied to nonmetal surface |
| CN202997055U (en) * | 2012-10-23 | 2013-06-12 | 北京邮电大学 | Double-sided subminiature RFID tag antenna |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103679235A (en) * | 2013-12-20 | 2014-03-26 | 昆山信德佳电气科技有限公司 | Monitoring device and method for fixed point positioning management of articles |
| CN107658559A (en) * | 2017-10-20 | 2018-02-02 | 杭州泽济电子科技有限公司 | Miniaturization anti-metal antenna and label |
| CN107658559B (en) * | 2017-10-20 | 2024-03-08 | 杭州泽济电子科技有限公司 | Miniaturized anti-metal antenna and tag |
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Application publication date: 20130130 |