CN104347945A - Broadband UHF (Ultra High Frequency) RFID (Radio Frequency Identification Device) electronic tag antenna and electronic tag - Google Patents
Broadband UHF (Ultra High Frequency) RFID (Radio Frequency Identification Device) electronic tag antenna and electronic tag Download PDFInfo
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- CN104347945A CN104347945A CN201310344100.1A CN201310344100A CN104347945A CN 104347945 A CN104347945 A CN 104347945A CN 201310344100 A CN201310344100 A CN 201310344100A CN 104347945 A CN104347945 A CN 104347945A
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Abstract
The invention discloses a broadband UHF (Ultra High Frequency) RFID (Radio Frequency Identification Device) electronic tag antenna. The broadband UHF RFID electronic tag antenna comprises an antenna substrate, a metal inner ring and a metal outer ring, wherein the metal inner ring and the metal outer ring are arranged on the surface of the antenna substrate; the enclosed annular metal inner ring is provided with an antenna feeding point; the metal inner ring is connected with the metal outer ring; the metal outer ring comprises a foldable dipole arm and a patch load; the foldable dipole arm and the patch load are connected into an enclosed annular structure. The broadband UHF RFID electronic tag antenna is simple in structural design, has high adaptability, is easy to implement at low cost, and can fully cover two working frequency ranges of UHF RFID equipment in China; the metal inner ring is provided with the antenna feeding point, and a central closed loop is constructed, so that the imaginary part of antenna resistance is easy to adjust, and adaptability to different types of chips is realized.
Description
Technical field
The present invention relates to technical field of RFID, particularly, relate to broadband UHF (Ultra High Frequency) electronic label antenna and adopt the electronic tag of this antenna.
Background technology
RFID is the english abbreviation of REID (Radio Frequency Identification), REID is a kind of automatic identification technology starting the nineties in 20th century to rise, and this technology utilizes radiofrequency signal realize contactless information transmission by Space Coupling (alternating magnetic field or electromagnetic field) and pass through the object that transmitted information reaches identification.RFID technique has unrivaled technical advantage in article identification tracking, thus has broad application prospects at industry-by-industries such as production, retail, logistics, traffic.
Along with flourish in China of UHF RFID technique, country has also formulated corresponding technical specification, the particularly issue of " 800/900MHz frequency range radio-frequency (RF) identification (RFID) technology application regulation (trying) ", the working frequency range of specification China UHF RFID device is 840MHz ~ 845MHz and 920Mhz ~ 925MHz two frequency ranges.
Traditional ultrahigh frequency electronic tag antenna is all dipole or the folded doublet of narrowband operation (within 20MHz), although impedance and Q value easily regulate, but cannot simultaneous adaptation two frequency ranges, directly cause different frequency ranges and must change different labels, be all larger waste from cost to efficiency.
Although existing broadband antenna technology is applicable to Chinese spectrum criterion, great majority all have employed special baseplate material or the antenna structure of complexity, cause the higher or manufacture difficulty of the manufacturing cost of antenna to strengthen; Impedance conditions simultaneously due to different chip is different, and the antenna of labyrinth is difficult to simply quantitative tuned impedance and Q value, thus adds design difficulty and R&D costs.
In sum, most ultrahigh frequency electronic tag antenna of the prior art is all the dipole antenna of arrowband, because dipole antenna is simply easy to manufacture, impedance adjustment scope is comparatively large, is applicable to very much the application of radio-frequency recognition system.But based on the actual conditions of Chinese Industrial Standards (CIS), same design cannot meet the normal work of two frequency ranges, and existing broadband antenna design is generally comparatively thick and heavy paster antenna, needs special media layer, and cost is higher, and ease for use is poor simultaneously; Complicated somatotype antenna or loop induction antenna, not easily regulate, general adaptability is not strong.
Summary of the invention
The present invention is the defect that simultaneously cannot meet the need of work of two frequency ranges in order to overcome prior art antenna, according to an aspect of the present invention, proposes a kind of broad band uhf RFID electric tag antenna.
According to the broad band uhf RFID electric tag antenna of the embodiment of the present invention, comprise antenna substrate, metallic inner and metal outer shroud, metallic inner and metal outer shroud are arranged on antenna substrate surface, metallic inner in closed circular is provided with antenna feed point, metallic inner is connected with metal outer shroud, metal outer shroud comprises folded dipole arm and paster load, and folded dipole arm is connected with paster load and forms closed loop configuration.
The present invention is the defect that simultaneously cannot meet the need of work of two frequency ranges in order to overcome prior art antenna, according to another aspect of the present invention, proposes a kind of broad band uhf RFID.
According to the broad band uhf RFID of the embodiment of the present invention, comprise label antenna and label chip, label antenna comprises antenna substrate, metallic inner and metal outer shroud, metallic inner and metal outer shroud are arranged on antenna substrate surface, metallic inner in closed circular is provided with antenna feed point, label chip is fixedly connected on antenna feed point, metallic inner is connected with metal outer shroud, metal outer shroud comprises folded dipole arm and paster load, and folded dipole arm is connected with paster load and forms closed loop configuration.
Broad band uhf RFID electric tag antenna of the present invention and electronic tag, structural design is simple, and strong adaptability, is easy to the realization of low cost, can completely covers two working frequency range of China UHF RFID device; Metallic inner is provided with antenna feed point, constitutes center closed loop, is easy to regulate antenna impedance imaginary part, the different types of chip of convenient adaptation.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in write specification, claims and accompanying drawing and obtain.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, together with embodiments of the present invention for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the overall structure schematic diagram of broad band uhf RFID electric tag antenna of the present invention;
Fig. 2 is the structure chart of folded doublet in prior art;
Fig. 3 is the change curve schematic diagram of inventive antenna impedance with frequency;
Fig. 4 is the schematic diagram of S11 parameter curve of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention not by the restriction of embodiment.
The present invention is the broad-band antenna based on dipole antenna, has the universality of the low cost of dipole antenna, flexibility and large bandwidth concurrently simultaneously, is applicable to very much the application of existing Chinese Industrial Standards (CIS).
The invention provides a kind of wideband electronic tag antenna design based on dipole structure.Be exactly the folded doublet structure that this antenna have employed improvement specifically, achieve the impedance matching capability more than 100MHz bandwidth, well cover two frequency ranges in Chinese super high frequency radio frequency identification frequency band specification.
As shown in Figure 1, the invention discloses a kind of broad band uhf RFID electric tag antenna (hereinafter referred to as label antenna), be made up of antenna substrate 1 and the metal routing be positioned on antenna substrate of rectangle.Wherein, metal routing is arranged on the surface of antenna substrate 1, and preferably, this metal routing is copper cash cabling, and this metal routing is arranged on the front of antenna substrate, and reverse side is without metal routing.
Metal routing comprises: metallic inner 3 and metal outer shroud, metallic inner 3 and metal outer shroud are rectangular configuration, metallic inner 3 is provided with antenna feed point 2, namely place the position of broad band uhf RFID chip (hereinafter referred to as label chip), label antenna and label chip can be made to form complete label product by the mode of wire bonding.Metal outer shroud comprises folded dipole arm 4 and paster load 5, folded dipole arm 4 is connected with paster load 5 and forms closed loop configuration, and metal outer shroud is 2, and metallic inner 3 is 1, form 1 group of label antenna, 2 metal outer shrouds are arranged on the both sides of 1 metallic inner 3 axisymmetricly.Preferably, the quantity of the metal outer shroud of label antenna of the present invention can be the twice of metallic inner quantity, forms and organizes label antenna more.
The metallic inner of rectangular ring and metal outer shroud, directly be connected with label chip, the change in size of antenna impedance to straight-flanked ring is very sensitive, so regulate the size of metallic inner and metal outer shroud to facilitate and effective adjustment label antenna impedance, particularly imaginary impedance; And regulate the size of folded dipole arm 4 and paster load 5 can adjust the radianting capacity of antenna particularly by the width of adjustment paster load 5, the real part of antenna impedance can be adjusted easily, thus with chip impedance conjugate impedance match, with reach ceiling capacity transmission.
Wherein, each metal outer shroud is made up of two sections of folded dipole arms 4 and one section of paster load 5, and the two ends of paster load 5 are connected with each one end of folded dipole arm 4 respectively, and the other end of folded dipole arm 4 is connected with the rectangle opposite side of metallic inner 3 respectively.
Label antenna of the present invention, antenna substrate 1 adopts any dielectric sheet material comprising common FR4 printed circuit board (PCB), and thickness is 0.8mm, and dielectric constant is 4.4, and loss angle tangent is 0.02.The metal live width of metallic inner 3 and folded dipole arm 4 is 1mm, and the area of rectangular metallic inner 3 is 18mm*8mm; Every section of folded dipole arm 4 length is 61mm; The area of paster load 5 is 16mm*4mm.
Passive ultrahigh frequency electronic tag of the present invention needs the electromagnetic wave sent by rectification reader to obtain energy to complete communication.In general, the input impedance of label chip is plural number, and is capacitive, and this complex impedance just needing label antenna to have perception forms conjugate impedance match with it, thus reaches Energy Transfer maximization.
The ultrahigh-frequency tag chip of the embodiment of the present invention is 32-j145 Ω in the impedance of 922.5MHz frequency.As shown in Figure 3, can find out, the label antenna of the embodiment of the present invention is in 840MHz to 920MHz frequency range, and antenna impedance changes to 31.3+j155 from 41.3+j126.6, and variation tendency is very steady.Fig. 4 is the S11 parameter curve of label antenna of the present invention, and in the frequency band of 830MHz to 950MHz, S11 is less than-10dB, and namely the bandwidth of whole label antenna has exceeded 120MHz, and completely covers two working frequency range of China UHF RFID device.
It should be noted that, label antenna of the present invention, by regulating the size of paster load 5, the radiation impedance of label antenna can be adjusted easily, adapting to dissimilar label chip to facilitate.
Existing folded doublet as shown in Figure 2, mainly utilizes the principle of field coupled to carry out work in far field, the little closed loop at center utilizes magnetic Field Coupling to carry out work near field, regulate imaginary impedance simultaneously; And 1/2nd wavelength of the corresponding steady job frequency of the equivalent electric length of folded dipole arm.If operating frequency changes, then can there is larger change in the impedance of existing folded doublet, directly cause antenna and chip impedance severe mismatch, reflected energy increases, projectile energy reduces, when external performance works exactly in broad frequency band, performance inconsistency is obvious, normally cannot work in broadband application occasion; Meanwhile, this folded doublet is limited in one's ability at the magnetic Field Coupling near field, easily occurs that near field not easily reads on the contrary, there is the phenomenon identifying blind spot.
The embodiment of the present invention is owing to have employed said structure, particularly pass through the modified foldable dipole structure that in Fig. 1, folded dipole arm 4 and paster load 5 form, the dipole arm of each opening is connected into closed loop, can be worked by magnetic Field Coupling mode equally when far-field radiation, because magnetic Field Coupling mode is insensitive for the change of frequency, this ensure that when operating frequency offset, the impedance variation of label antenna is slower, external performance is exactly that label antenna can work under wider frequency rate, obviously strengthen in the magnetic Field Coupling ability near field simultaneously, positive effect is had to raising discrimination.
Label antenna of the present invention, is made up of the peripheral closed loop of label antenna folded dipole arm 4 and paster load 5, form follow-on folded dipole arm, can, at far-field region inductive electromagnetic signal, be conducive to expanding Antenna Operation bandwidth.
In addition, the embodiment of the invention also discloses a kind of broad band uhf RFID, comprise label antenna and label chip, label antenna comprises antenna substrate, metallic inner and metal outer shroud, metallic inner and metal outer shroud are arranged on antenna substrate surface, metallic inner in closed circular is provided with antenna feed point, label chip is fixedly connected on antenna feed point, metallic inner is connected with metal outer shroud, metal outer shroud comprises folded dipole arm and paster load, and folded dipole arm is connected with paster load and forms closed loop configuration.
Label antenna is wherein the broad band uhf RFID electric tag antenna of the embodiment of the present invention above, and particular content repeats no more.
Label antenna of the present invention and electronic tag, structural design is simple, and strong adaptability, is easy to the realization of low cost, can completely covers two working frequency range of China UHF RFID device; Metallic inner 3 is provided with antenna feed point 2, constitutes center closed loop, is easy to regulate antenna impedance imaginary part, the different types of chip of convenient adaptation.
Label antenna of the present invention and electronic tag, because entire physical adopts closed-loop structure, effectively can improve the problem in read direction cavity, near field, helpful for raising read rate.
The present invention can have multiple multi-form embodiment; above for Figure of description by reference to the accompanying drawings to technical scheme of the present invention explanation for example; this does not also mean that the instantiation that the present invention applies can only be confined in specific flow process or example structure; those of ordinary skill in the art should understand; specific embodiments provided above is some examples in multiple its preferred usage, and the execution mode of any embodiment the claims in the present invention all should within technical solution of the present invention scope required for protection.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a broad band uhf RFID electric tag antenna, it is characterized in that, comprise antenna substrate, metallic inner and metal outer shroud, described metallic inner and metal outer shroud are arranged on described antenna substrate surface, described metallic inner in closed circular is provided with antenna feed point, described metallic inner is connected with metal outer shroud, and described metal outer shroud comprises folded dipole arm and paster load, and described folded dipole arm is connected with paster load and forms closed loop configuration.
2. antenna according to claim 1, it is characterized in that, the quantity of described metal outer shroud is the twice of metallic inner quantity, forms and organizes label antenna more, often organizing in described label antenna, two described metal outer shrouds are arranged on the both sides of a described metallic inner axisymmetricly.
3. antenna according to claim 1 and 2, it is characterized in that, each metal outer shroud is made up of two sections of folded dipole arms and one section of paster load, the two ends of described paster load are connected with each one end of described folded dipole arm respectively, and the other end of described folded dipole arm is connected with described metallic inner respectively.
4. antenna according to claim 1 and 2, is characterized in that, described antenna feed point is connected with label chip in the mode of wire bonding.
5. antenna according to claim 1 and 2, is characterized in that, described metallic inner and the rectangular vibrational power flow of metal outer shroud.
6. a broad band uhf RFID, it is characterized in that, comprise label antenna and label chip, described label antenna comprises antenna substrate, metallic inner and metal outer shroud, described metallic inner and metal outer shroud are arranged on described antenna substrate surface, described metallic inner in closed circular is provided with antenna feed point, described label chip is fixedly connected on described antenna feed point, described metallic inner is connected with metal outer shroud, described metal outer shroud comprises folded dipole arm and paster load, described folded dipole arm is connected with paster load and forms closed loop configuration.
7. label according to claim 6, it is characterized in that, the quantity of described metal outer shroud is the twice of metallic inner quantity, forms and organizes label antenna more, often organizing in described label antenna, two described metal outer shrouds are arranged on the both sides of a described metallic inner axisymmetricly.
8. the label according to claim 6 or 7, it is characterized in that, each metal outer shroud is made up of two sections of folded dipole arms and one section of paster load, the two ends of described paster load are connected with each one end of described folded dipole arm respectively, and the other end of described folded dipole arm is connected with described metallic inner respectively.
9. the label according to claim 6 or 7, is characterized in that, described antenna feed point is connected with label chip in the mode of wire bonding.
10. the label according to claim 6 or 7, is characterized in that, described metallic inner and the rectangular vibrational power flow of metal outer shroud.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310344100.1A CN104347945A (en) | 2013-08-08 | 2013-08-08 | Broadband UHF (Ultra High Frequency) RFID (Radio Frequency Identification Device) electronic tag antenna and electronic tag |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310344100.1A CN104347945A (en) | 2013-08-08 | 2013-08-08 | Broadband UHF (Ultra High Frequency) RFID (Radio Frequency Identification Device) electronic tag antenna and electronic tag |
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| CN104347945A true CN104347945A (en) | 2015-02-11 |
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| CN201310344100.1A Pending CN104347945A (en) | 2013-08-08 | 2013-08-08 | Broadband UHF (Ultra High Frequency) RFID (Radio Frequency Identification Device) electronic tag antenna and electronic tag |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106529882A (en) * | 2016-11-16 | 2017-03-22 | 国网山东省电力公司荣成市供电公司 | Smart storage system based on narrowband internet-of things |
| CN106654524A (en) * | 2016-12-29 | 2017-05-10 | 华侨大学 | Double-layer structured broadband UHF RFID anti-metal tag antenna |
| CN106785341A (en) * | 2017-01-09 | 2017-05-31 | 成都信息工程大学 | A kind of Multipurpose label antenna |
| CN107977700A (en) * | 2017-12-21 | 2018-05-01 | 深圳市鸿陆技术有限公司 | A kind of metal electronic tag |
| CN113850361A (en) * | 2021-10-14 | 2021-12-28 | 北京京东乾石科技有限公司 | Electronic tag and antenna thereof |
| CN114665259A (en) * | 2022-04-15 | 2022-06-24 | 合肥工业大学 | Ultra-wideband tag antenna suitable for metal liquid cross-coupling environment |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106529882A (en) * | 2016-11-16 | 2017-03-22 | 国网山东省电力公司荣成市供电公司 | Smart storage system based on narrowband internet-of things |
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| CN106654524A (en) * | 2016-12-29 | 2017-05-10 | 华侨大学 | Double-layer structured broadband UHF RFID anti-metal tag antenna |
| CN106785341A (en) * | 2017-01-09 | 2017-05-31 | 成都信息工程大学 | A kind of Multipurpose label antenna |
| CN106785341B (en) * | 2017-01-09 | 2023-09-01 | 成都信息工程大学 | Multipurpose tag antenna |
| CN107977700A (en) * | 2017-12-21 | 2018-05-01 | 深圳市鸿陆技术有限公司 | A kind of metal electronic tag |
| CN113850361A (en) * | 2021-10-14 | 2021-12-28 | 北京京东乾石科技有限公司 | Electronic tag and antenna thereof |
| CN114665259A (en) * | 2022-04-15 | 2022-06-24 | 合肥工业大学 | Ultra-wideband tag antenna suitable for metal liquid cross-coupling environment |
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