CN103138041A - Omni-directional radio frequency identification (RFID) tag antenna, RFID tag and RFID system - Google Patents
Omni-directional radio frequency identification (RFID) tag antenna, RFID tag and RFID system Download PDFInfo
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- CN103138041A CN103138041A CN2011103792367A CN201110379236A CN103138041A CN 103138041 A CN103138041 A CN 103138041A CN 2011103792367 A CN2011103792367 A CN 2011103792367A CN 201110379236 A CN201110379236 A CN 201110379236A CN 103138041 A CN103138041 A CN 103138041A
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Abstract
The invention provides an omni-directional radio frequency identification (RFID) tag antenna, an RFID tag and an RFID system and belongs to the technical field of RFID. The RFID tag antenna comprises m antenna modules (m is an even number larger than or equal to 6), the m antenna modules form a central symmetry structure along location points of a feed source body, and each antenna module comprises a main T-shaped radiating body, two open circuit buckled microstrip lines, folded microstrip lines and feeder lines. The RFID tag antenna has the advantages of being good in design flexibility and easy to achieve good conjugate match between impedances of tag chips. Besides, the omni-directional radiation characteristic and wide area coverage are good, so that the impedance characteristic and the radiation characteristic are greatly improved.
Description
Technical field
The invention belongs to radio-frequency (RF) identification (Radio Frequency Identification, RFID) technical field, relate to omnidirectional radiation the RFID label antenna, comprise the RFID label of this RFID label antenna and the rfid system that comprises this RFID label.
Background technology
The RFID technology extensively has been widely used in every field, for example, the fields such as sale of goods, transportation, production, waste management, postal tracking, aviation luggage management, vehicle toll management, the shortcomings such as traditional strip of paper shape code is little because of its storage capacity, can not rewrite, in the identification field, it is slowly substituted by rfid system.
Rfid system normally comprises the RFID reader with label antenna of a plurality of RFID labels, at least one and this RFID label communication and the calculation element that is used for controlling this RFID reader.Normally, the RFID label is comprised of RFID label antenna and label chip; The RFID reader comprises: be used for energy or information are provided to the transmitter of RFID label and the receiver that is used for receiving from the RFID label identity and out of Memory; Calculation element is processed the information that obtains by the RFID reader.The transmitter of RFID reader is exported RF (Radio Frequency, radio frequency) signal via label antenna, thereby generates an electromagnetic field, and this electromagnetic field makes the RFID label return to the RF signal of carry information.
In the RFID label, the radio wave signal of electromagnetism place generation is to be sent to label chip via its RFID label antenna, and the current signal of label chip is to be sent in the space by the RFID label antenna.Therefore, current signal coupling in an end of RFID label antenna and label chip, radio wave signal coupling in the other end and space.Therefore, the key property of RFID label antenna comprises two aspects, on the one hand for describing the characteristic of the relative label chip of RFID label antenna, i.e. impedance operator, on the other hand for describing the relation property of the radio wave in day RFID label antenna and space, i.e. radiation characteristic.In the RFID label antenna, about the Specifeca tion speeification of impedance operator, input impedance is arranged, about the major parameter of radiation characteristic, omni-directional, gain (gain), polarization, efficient etc. are arranged.
Figure 1 shows that the structural representation of a kind of RFID label antenna of the prior art.This RFID label antenna is a kind of of dipole-type antenna, and it is by radiant body 11 radiation.Also there is the antenna of various folded dipole subtypes in the dipole-type antenna.Figure 2 shows that the structural representation of another RFID label antenna of the prior art.This RFID label antenna adopts camber line broken line type radiant body 15 and conductor loops 17, and radiant body 15 and conductor loops 17 are passed through inductance coupling high.
All there is the poor shortcoming of design flexibility in the structure of the RFID label antenna of prior art, so it can affect its impedance operator and radiation characteristic when forming the RFID label with the label chip coupling.And the RFID label antenna can only directed radiation especially aspect the omni-directional of radiation characteristic, and the omnidirectional radiation characteristic is poor, can only orientation read.
Summary of the invention
One of purpose of the present invention is, improves the impedance operator of RFID label antenna.
Another purpose of the present invention is, improves the radiation characteristic of RFID label antenna, especially improves its omnidirectional radiation.
For realizing above purpose or other purpose, the invention provides following technical scheme.
According to an aspect of of the present present invention, a kind of RFID label antenna is provided, described antenna is connected with the feed body, described antenna comprises m Anneta module, a described m Anneta module forms centrosymmetric structure about the residing location point of described feed body, and wherein, m is the even number more than or equal to 6; And each Anneta module comprises:
T-shaped main radiator;
Article two, open circuit bends microstrip line, and it is arranged in parallel and all is connected with described main radiator;
Folding microstrip line, it is placed between described two open circuit bending microstrip lines and with open circuit bending microstrip line and is connected; And
Feeder line, it operationally is connected to realize the connection between described Anneta module and described feed body with described feed body.
In embodiment according to RFID label antenna provided by the invention, m can equal 6 or 8.
According to a preferred embodiment of RFID label antenna provided by the invention, wherein, in a described m Anneta module, each Anneta module and another corresponding Anneta module arrange in opposite directions, and two Anneta modules that arrange in opposite directions are placed on same axis.
In the embodiment of the RFID label antenna that provides before, preferably, two Anneta modules that arrange in opposite directions that are placed on same axis are symmetrical about this axis shaft.
In the embodiment of the RFID label antenna that provides before, preferably, the angle between adjacent described axis equates.
According to the another preferred embodiment of RFID label antenna provided by the invention, wherein, the ground arrangement of described Anneta module equal angles spacing is to form circular planar structure antenna.
Sign in the embodiment of antenna at the RFID that provides before, preferably, the areal extent of described T-shaped main radiator is 150 square millimeters to 600 square millimeters.
In the embodiment of the RFID label antenna that provides before, preferably, described two open circuit bending microstrip lines are opposite in described feed body and form opening.
In the embodiment of the RFID label antenna that provides before, preferably, described folding microstrip line forms many broken lines by right-angle bending, substantially is parallel to each other between every broken line.
In the embodiment of the RFID label antenna that provides before, preferably, every broken line equal in length, the spacing between adjacent described broken line equates.
In the embodiment of the RFID label antenna that provides before, preferably, the feeder line of each Anneta module is positioned on described axis.
According to another aspect of the present invention, a kind of RFID label is provided, it comprises:
Matrix,
Be arranged at any described RFID label antenna of embodiment on described matrix, above; And
Label chip as the feed body.
Provide a kind of rfid system also on the one hand according to of the present invention, comprise a plurality of above any described RFID tag of embodiment.
Technique effect of the present invention is:
(1) according to the impedance operator of label chip, can be by T-shaped main radiator, open circuit bending microstrip line and/or folding microstrip line be designed, can realize easily conjugate impedance match good between the impedance of the impedance of label antenna and label chip.Therefore, RFID label antenna design flexibility of the present invention is good, and the conjugate impedance match flexibility ratio of antenna impedance and label chip impedance is large, and the impedance operator of RFID label antenna is improved.
(2) six or six above Anneta modules make the omnidirectional radiation characteristic of this RFID label antenna good about the characteristics of division center symmetry, and multi-directionally reads.Simultaneously, T-shaped main radiator can improve gain and RCS (the Radar Cross-Section of RFID label antenna effectively, RCS) value, RFID label of the present invention can be realized good gain index in the band limits of 800MHz to 1000MHz, the wide area spreadability is good.Therefore, radiation characteristic also is improved.
(3) this RFID tag antenna structure is compact to design, area is little.
Description of drawings
From following detailed description by reference to the accompanying drawings, will make above and other objects of the present invention and advantage more fully clear, wherein, same or analogous key element adopts identical label to represent.
Fig. 1 is the structural representation of a kind of RFID label antenna of the prior art;
Fig. 2 is the structural representation of another RFID label antenna of the prior art;
Fig. 3 is the structural representation of the RFID label antenna that provides according to one embodiment of the invention;
Fig. 4 is the structural representation of one of them Anneta module in RFID label antenna embodiment shown in Figure 4;
Fig. 5 is the structural representation of the RFID label antenna that provides according to further embodiment of this invention;
Fig. 6 is the directional diagram of RFID label antenna embodiment illustrated in fig. 3;
Fig. 7 is the directional diagram of the spherical coordinate of RFID label antenna embodiment illustrated in fig. 3 when being 90 °;
Directional diagram when Fig. 8 is the horizontal dipole work of RFID label antenna embodiment illustrated in fig. 3.
Embodiment
The below introduces is a plurality of some in may embodiment of the present invention, aims to provide basic understanding of the present invention, is not intended to confirm key of the present invention or conclusive key element or limits claimed scope.Easily understand, according to technical scheme of the present invention, do not changing under connotation of the present invention other implementation that one of ordinary skill in the art can propose mutually to replace.Therefore, following embodiment and accompanying drawing are only the exemplary illustrations to technical scheme of the present invention, and should not be considered as of the present invention all or be considered as restriction or restriction to technical solution of the present invention.
The structural representation of the RFID label antenna that provides according to one embodiment of the invention is provided, Figure 4 shows that the structural representation of one of them Anneta module in RFID label antenna embodiment shown in Figure 4.This antenna applications is in the RFID label, and therefore, it is two dimensional surface antenna (for example flat plane antenna on xy plane).As shown in Figure 3, the RFID label antenna comprises six Anneta modules, be Anneta module 20a, 20b, 20c, 20d, 20e and 20f, wherein, Anneta module 20a and 20d are arranged on axis 281 opposite to each other, Anneta module 20b and 20e are arranged on axis 283 opposite to each other, and Anneta module 20c and 20f are arranged on axis 285 opposite to each other.In this embodiment, for convenience of description, the direction at axis 281 places is defined as the x direction, is defined as the y direction perpendicular to the direction of axis 281.But it will be appreciated that, the definition of this coordinate is relative, and it can change definition mode according to the variation of the storing mode of RFID label antenna.
Continue as shown in Figure 3,29 is the distributing point of RFID label, and it is used for putting feed body (for example label chip).In this invention, the RFID label antenna be the centrosymmetric structure about distributing point 29 symmetries, and particularly, six Anneta module 20a-20f form the centrosymmetric structure about distributing point 29 symmetries, thus the omnidirectional radiation characteristic of assurance RFID label antenna.In the preferred embodiment, six Anneta module 20a-20f are the essentially identical Anneta module of structure, and it is arranged in circular to equal angles spacing centered by distributing point 29, and for example, the mutual angle between axis 281,283,285 is 60 °.Simultaneously, every pair of Anneta module that is on same axis is symmetrical about this axis shaft, and for example, Anneta module 20a and 20d be about central axial line 281 axial symmetry, and then, can improve better the omnidirectional radiation characteristic of RFID label antenna.
Particularly, the basic structure of each Anneta module 20 (20a, 20b, 20c, 20d, 20e and 20f) is anticipated as shown in Figure 4, and the Anneta module that uses in Fig. 3 is preferably identical structure mutually.In this embodiment, Anneta module 20 comprises T-shaped main radiator 217, feeder line 215, folding microstrip line 213 and two open circuit bending microstrip lines 211, below in conjunction with Fig. 3 and shown in Figure 4, describes its concrete structure in detail.
Anneta module 20 is provided with T-shaped main radiator 217, T-shaped main radiator 217 comprises lateral part (part that arranges for the y direction of principal axis) and the longitudinal component (part that arranges for the x direction of principal axis) that is used to form T-shape in Anneta module 20 in Anneta module 20, need to prove, " lateral part " and " longitudinal component " in this article define with respect to T-shape.T-shaped main radiator 217 is with respect to broken line type radiant body shown in Figure 2, and effective radiating area increases greatly on the one hand; On the other hand, the imaginary part of the impedance of this RFID label antenna of the area effect of T-shaped main radiator, the imaginary part that can regulate easily impedance by the area of regulating T-shaped main radiator; Again on the one hand, can effectively improve gain and RCS (Radar Cross-Section, the RCS) value of RFID label antenna.In one embodiment, the area of T-shaped main radiator 217 can be arranged in 150 square millimeters to 600 square millimeters scopes.Therefore, the gain of this antenna can increase greatly, is particularly suitable for the application of UHF (hyper band), for example, is applied to the band limits of 800MHz to 1000MHz.
Anneta module 20 is provided with two open circuit bending microstrip lines 211 that are parallel to each other, in this embodiment, article two, open circuit bending microstrip line 211 is connected with T-shaped main radiator 217, and the upper edge of basic and T-shaped main radiator 217 and the lower edge setting ("up" and "down" is that the direction with respect to the y axle defines) of aliging respectively.Open circuit bending microstrip line 211 is opposite in distributing point 29 formation openings, in the open area, is also between two open circuit bending microstrip lines 211, is used for storing and folds microstrip line 213 and feeder line 215.In this example, every open circuit bending microstrip line 211 comprises two mutual substantially parallel broken lines, and it is bent to form by outward direction.The specific structural features of open circuit bending microstrip line 211 (such as length dimension etc.) mainly determines the real part of the impedance of antenna.
Between two open circuit bending microstrip lines 211, folding microstrip line 213 is set, the head and the tail part of folding microstrip line 213 is connected with two open circuit bending microstrip lines respectively, and it is set to rugosity, thereby is conducive to save the entire area of antenna.Can form many broken lines through right-angle bending particularly in folding microstrip line 213, substantially be parallel to each other between every broken line, and in this embodiment, every broken line equal in length, the spacing between broken line also equates.But this is not restrictive, and for example, in other embodiments, the length of every broken line is set to unequal, and the spacing between broken line also is set to unequal.The specific structural features (such as length dimension, broken line hop count etc.) of folding microstrip line 213 can affect the imaginary part of the impedance of antenna.
Anneta module 20 also is provided with the feeder line 215 that is positioned at axis 281, the two ends of feeder line 215 connect respectively distributing point 29 and folding microstrip line 213, thereby, can realize that folding microstrip line 213 is connected with the feed body of distributing point 29, and then realize that Anneta module and feed body are of coupled connections.Particularly, feeder line 215 can be parallel to the broken line setting in folding microstrip line 213.
In a preferred embodiment, as shown in Figure 4, Anneta module 21 is structurally also about axis 281 axial symmetry.
The structural representation of the RFID label antenna that provides according to further embodiment of this invention is provided.As shown in Figure 5, than embodiment illustrated in fig. 3, its main difference has been to increase the quantity of Anneta module 20, in this embodiment, the RFID label antenna comprises 8 Anneta modules, be Anneta module 20a, 20b, 20c, 20d, 20e, 20f, 20g and 20h, wherein, Anneta module 20a and 20e are arranged on axis 281 opposite to each other, Anneta module 20b and 20f are arranged on axis 283 opposite to each other, Anneta module 20c and 20g are arranged on axis 285 opposite to each other, and wire module 20d and 20h are arranged on axis 287 opposite to each other.In this embodiment, for convenience of description, the direction at axis 281 places is defined as the x direction, the direction at axis 285 places is defined as the y direction, it will be appreciated that equally, the definition of this coordinate is relative, and it can change definition mode according to the variation of the storing mode of RFID label antenna.
Continue as shown in Figure 5,8 Anneta module 20a-20h form the centrosymmetric structure about distributing point 29 symmetries, thereby guarantee the omnidirectional radiation characteristic of RFID label antenna.Preferably, centered by distributing point 29, be arranged in circular to the equal angles spacing, for example, the mutual angle between axis 281,283,285,287 is 45 °.Simultaneously, every pair of Anneta module that is on same axis is symmetrical about this axis shaft.Similarly, in this was implemented, Anneta module 20a-20h all used Anneta module 20 as shown in Figure 4.
It will be appreciated that, in RFID label antenna provided by the invention, the concrete quantity of included Anneta module 20 is not limited by above embodiment, as long as a plurality of Anneta modules can be centered by distributing point 29 point, arranging the centrosymmetric structure about point centered by distributing point 29 that forms circular gets final product, for example, Anneta module 20 can also be 10,12 (even numbers), and Anneta module 20 numbers are more, the omnidirectional radiation characteristic of RFID label antenna is better, but the structure relative complex.Therefore, when selecting the number of Anneta module, need to consider the size of structural complexity and each Anneta module.
The structural representation of the RFID label that provides according to one embodiment of the invention is provided.In this embodiment, the RFID label uses the RFID label antenna of embodiment as shown in Figure 3, and this antenna is arranged on matrix 50, particularly, RFID label antenna 30 can pass through the methods such as printing, etching and form on matrix 50, and the concrete material category of matrix 50 is not restrictive.Label chip 90 is placed in distributing point 29 parts, and in this embodiment, distributing point 29 has two groups of incoming ends and earth terminal with label chip 90.Therefore, the RFID label antenna can be by the current signal coupling in its feeder line 36 and label chip 90.
Reach as previously discussed, the symmetry structure of Fig. 3 and RFID label antenna shown in Figure 5 arranges and can greatly improve its omnidirectional radiation characteristic, thereby conveniently reads.Figure 7 shows that the directional diagram when RFID label antenna Theta (spherical coordinate) embodiment illustrated in fig. 3 is 90 °, it has good omni-directional radiation characteristic.Directional diagram when Fig. 8 is the horizontal dipole of RFID label antenna (dipole) embodiment illustrated in fig. 3 work.
Simultaneously, in Fig. 3 and RFID label antenna shown in Figure 5, its impedance can be expressed as A+Bj, wherein " A " represents the real part of impedance, the imaginary part of " B " expression impedance, mainly by the decision of open circuit bending microstrip line, imaginary part B is mainly determined by folding microstrip line and main radiator real part A; According to the impedance operator of label chip, those skilled in the art open a way by design and bend the structural parameters such as length dimension of microstrip line in conjunction with above enlightenment of the present invention, and its inductance parameters is easy to regulate, thereby can regulate easily real impedance A; Also can be according to the impedance operator of label chip 90, those skilled in the art are in conjunction with above enlightenment of the present invention, the imaginary part B that regulates easily imaginary impedance B and/or regulate easily impedance by the area of regulating T-shaped main radiator by designing the concrete structure that folds microstrip line.And then, can realize good conjugate impedance match between the impedance A+Bj of label antenna of the present invention and the impedance of label chip 90.Therefore, RFID label antenna design flexibility is good, and the conjugate impedance match flexibility ratio of antenna impedance and label chip impedance is large, and the impedance operator of RFID label antenna is greatly enhanced.
And, T-shaped main radiator can improve gain and RCS (the Radar Cross-Section of RFID label antenna effectively, RCS) value, RFID label of the present invention can be realized good gain index in the band limits of 800MHz to 1000MHz, the wide area spreadability is good.Therefore, radiation characteristic also is improved.
The present invention provides rfid system simultaneously, and it comprises the RFID label described in a plurality of above embodiment, and this rfid system also comprises the RFID reader with antenna and the calculation element that is used for controlling this RFID reader.The parts that RFID reader and calculation element can be realized fully for those skilled in the art are described no longer one by one at this.
Above example has mainly illustrated RFID label antenna of the present invention, RFID label and rfid system thereof.Although only the some of them embodiments of the present invention are described, those of ordinary skills should understand, and the present invention can be within not departing from its purport and scope implements with many other forms.Therefore, the example of showing and execution mode are regarded as illustrative and not restrictive, in the situation that do not break away from spirit of the present invention as defined in appended each claim and scope, the present invention may be contained various modifications and replacement.
Claims (13)
1. RFID antenna, described antenna is connected with the feed body, it is characterized in that, described antenna comprises m Anneta module, a described m Anneta module forms centrosymmetric structure about the residing location point of described feed body, and wherein, m is the even number more than or equal to 6; And each Anneta module comprises:
T-shaped main radiator;
Article two, open circuit bends microstrip line, and it is arranged in parallel and all is connected with described main radiator;
Folding microstrip line, it is placed between described two open circuit bending microstrip lines and with open circuit bending microstrip line and is connected; And
Feeder line, it operationally is connected to realize the connection between described Anneta module and described feed body with described feed body.
2. RFID antenna as claimed in claim 1, is characterized in that, m equals 6 or 8.
3. RFID antenna as claimed in claim 1, is characterized in that, in a described m Anneta module, each Anneta module and another corresponding Anneta module arrange in opposite directions, and two Anneta modules that arrange in opposite directions are placed on same axis.
4. RFID antenna as claimed in claim 3, is characterized in that, two Anneta modules that arrange in opposite directions that are placed on same axis are symmetrical about this axis shaft.
5. RFID antenna as described in claim 3 or 4, is characterized in that, the angle between adjacent described axis equates.
6. RFID antenna as claimed in claim 1, is characterized in that, the ground arrangement of described Anneta module equal angles spacing is to form circular planar structure antenna.
7. RFID antenna as claimed in claim 1, is characterized in that, the areal extent of described T-shaped main radiator is 150 square millimeters to 600 square millimeters.
8. RFID antenna as claimed in claim 1, is characterized in that, described two open circuit bending microstrip lines are opposite in described feed body and form opening.
9. RFID antenna as claimed in claim 1, is characterized in that, described folding microstrip line forms many broken lines by right-angle bending, substantially is parallel to each other between every broken line.
10. RFID antenna as claimed in claim 9, is characterized in that, every broken line equal in length, and the spacing between adjacent described broken line equates.
11. RFID antenna, is characterized in that as claimed in claim 3, the feeder line of each Anneta module is positioned on described axis.
12. a RFID tag is characterized in that, comprising:
Matrix,
Be arranged at the RFID antenna as described in any one in claim 1-11 on described matrix; And
Label chip as the feed body.
13. a radio-frequency recognition system is characterized in that, comprises a plurality of RFID tag as claimed in claim 12.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103792367A CN103138041A (en) | 2011-11-23 | 2011-11-23 | Omni-directional radio frequency identification (RFID) tag antenna, RFID tag and RFID system |
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| CN2011103792367A CN103138041A (en) | 2011-11-23 | 2011-11-23 | Omni-directional radio frequency identification (RFID) tag antenna, RFID tag and RFID system |
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| CN104050499A (en) * | 2014-06-24 | 2014-09-17 | 中国科学院微电子研究所 | High-frequency radio frequency identification label |
| CN106252834A (en) * | 2016-09-09 | 2016-12-21 | 爱康普科技（大连）有限公司 | Antenna and tag reading device |
| CN111525262A (en) * | 2020-05-26 | 2020-08-11 | 网络通信与安全紫金山实验室 | Circular multi-beam phased array antenna and communication method |
| CN111931893A (en) * | 2020-07-10 | 2020-11-13 | 菜鸟智能物流控股有限公司 | Radio frequency label |
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Application publication date: 20130605 |