CN109713427B - Ultra-thin flexible UHF RFID anti-metal label antenna - Google Patents
Ultra-thin flexible UHF RFID anti-metal label antenna Download PDFInfo
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Abstract
The invention provides an ultrathin flexible UHF RFID anti-metal tag antenna, which comprises: the label protective layer, the chip, the antenna layer and the substrate layer are sequentially attached from top to bottom; the antenna layer comprises two functional parts, namely a radiation unit and a metal bottom plate which are etched from left to right in sequence, and the two functional parts are connected by a connecting wire; the radiation patch is combined with the electric small loop feed structure by a main radiation patch and is connected by an asymmetric connecting wire; the metal bottom plate is provided with a bending groove. The flexible UHF RFID anti-metal tag can efficiently adjust the impedance of the tag antenna by adjusting the structural positions of the small electric ring and the asymmetric connecting line so as to achieve the aim of matching with the impedance of a chip. The invention has simple structure, common material selection and low cost, can be applied to the surfaces of metal flat plates, various curved surface parts and circular tube products, is not influenced by metal materials and has wider production applicability.
Description
Technical Field
The invention relates to the field of radio frequency identification sensing, in particular to an ultrathin flexible UHF RFID anti-metal tag.
Background
In recent years, Radio Frequency Identification (RFID) technology is widely favored in the fields of manufacturing, logistics, monitoring and detection due to its wireless and passive characteristics, and currently, a product tracking function in the production and logistics processes is realized. The electronic tag in the RFID system mainly comprises an antenna layer, a medium base layer and a protective layer. Along with the increasingly complex and miniaturized structure of the object to be identified, the demand for the label to be attached to the product is increasing. The biggest problem of the electronic tag in the prior art is that the antenna layer and the chip element are attached to the rigid medium layer, so that the tag does not have a bending function and cannot meet the installation requirements of bending and large curvature, such as scenes of metal pipes, human or animal bodies and the like, and the development of the electronic tag is restricted.
Secondly, the performance of the label fluctuates greatly due to the fact that the label is located on different materials. Especially aiming at the metal environment with the widest application at present, a plurality of solutions such as folded dipoles, wave-absorbing materials, EBG/AMC structures and the like have been proposed recently. The use of these metal-resistant methods, such as special materials and antenna structures, increases the cost of the tag, which is not favorable for mass production of electronic tags.
Finally, as the performance of the tag requires complex impedance matching between the antenna and the chip, many types of antennas for adjusting impedance, such as T-type matching, embedded structures, coupled structures, etc., have emerged. However, these types are usually accompanied by the change of the use frequency of the antenna during the adjustment process, so that the adjustment process is more complicated and tedious, and the efficient implementation of the antenna design is not facilitated. Meanwhile, the change of the partial structure can also change the outline size of the label, which is not beneficial to the miniaturization of the label.
In recent years, some concepts and results of flexible metal-resistant tags have appeared, such as flexible uhf metal-resistant electronic tag of patent No. 201310269671.3; and a flexible metal-resistant UHF frequency band RFID tag with the patent number of 201320329575.9; although these efforts improve the conventional label to some extent, they still have the disadvantages of complicated structure, special material selection and high cost, and are not favorable for mass production of metal-resistant labels.
Disclosure of Invention
In order to solve the problems, the invention provides a flexible UHF RFID anti-metal tag which is characterized by comprising a tag protection layer, a chip, an antenna layer and a substrate layer which are sequentially attached from top to bottom; the base plate layer comprises a first medium layer and a second medium layer which are sequentially attached from top to bottom, the first medium layer is attached to the antenna layer, and the second medium layer is located in a U-shaped bent space of the first medium layer.
Preferably, the flexible UHF RFID anti-metal tag further comprises a protective layer, wherein the protective layer is coated on the tag chip, and the protective layer is made of ink.
Preferably, the tag chip and the antenna layer are fixed by an inverse packaging process.
Preferably, the antenna layer is processed on the first dielectric layer, the antenna layer comprises two functional parts, namely a radiating unit and a metal bottom plate which are etched sequentially from left to right, and the two functional parts are connected by a connecting wire.
Preferably, the radiating element of the antenna layer is composed of a main radiating patch and an electrical small loop structure; the electric small ring structure is embedded into the main radiating sheet and is connected with the main radiating sheet through a non-centrosymmetric connecting line; and at the same time, the main radiating plate is provided with a U-shaped groove to increase the length of the flow path of the antenna surface.
Preferably, the radiating element of the antenna layer has a length of 56mm and a width of 20-21 mm.
Preferably, the electrical small loop structure of the antenna layer has a length of 16-16.5mm and a width of 8-8.5 mm.
Preferably, the asymmetric connecting line between the main radiating patch and the electrical small loop structure of the antenna layer is respectively located at the bottom edge and the right edge of the electrical small loop structure, and the line width of the asymmetric connecting line is consistent with the line width of the electrical small loop.
Preferably, the connecting wire of the antenna layer positioned on the right side can be shifted to the left according to the length of the wide side of the electric small ring structure;
preferably, the metal chassis functional portion of the antenna layer is separated by a serpentine slot to increase tag gain.
Preferably, the meandering groove portion of the metal chassis of the antenna layer has a width direction short side of 12-12.5mm and a long side of 15.6-16.1 mm; the length direction is 11.2.75-11.5 mm.
Preferably, the antenna layer and the metal bottom plate layer are made of copper or aluminum, the antenna is compounded on the first dielectric layer by utilizing an etching process, and the thickness of the antenna layer is 10-16 um.
Preferably, the first dielectric layer is a polymer film, the polymer film is made of polyimide or polyethylene terephthalate, the second dielectric layer is a foam dielectric layer, and the first dielectric layer and the second dielectric layer are bonded by using a back adhesive.
Preferably, the thickness of the first dielectric layer is 50-125um, the length is 112.6-113.25mm, and the width is 20-21 mm; the second dielectric layer has a thickness of 0.5-1mm, a length of 56mm and a width of 20-21 mm.
Preferably, the flexible UHF RFID anti-metal tag is adhered to the metal member with a non-setting adhesive.
On the other hand, the invention also provides a design and verification method of the flexible UHF RFID anti-metal electronic tag, which comprises the following steps:
s1, optimizing and determining the material and the optimal parameters of the flexible UHF RFID anti-metal label by utilizing HFSS or CST (high frequency signal transmission system) simulation software, and manufacturing the flexible UHF RFID anti-metal label;
s2, connecting the tag force reader with the flexible UHF RFID anti-metal label and collecting the performance parameters of the flexible UHF RFID anti-metal label until the flexible UHF RFID anti-metal label obtains the optimal reading distance and reads information.
The invention provides an ultrathin flexible UHF RFID anti-metal tag, which does not adopt a special mode to shield metal influence, but adopts a microstrip antenna structure, takes a metal component as the extension of a metal bottom plate layer to eliminate the interference of metal on an antenna equivalent circuit, so that the information of the flexible UHF RFID anti-metal tag can be read and written normally; meanwhile, the antenna structure capable of effectively adjusting the impedance matching coefficient under the condition that the use frequency point of the antenna is almost unchanged is designed, and the antenna design work of specific use frequency can be efficiently completed. The flexible UHF RFID anti-metal tag has the advantages of simple structure, common material selection and low cost, can be applied to metal flat plates, surfaces of various curved surface parts and circular tube products, is not influenced by metal materials, and has wide production applicability. .
Drawings
FIG. 1 is a schematic structural diagram of an ultra-thin flexible UHF RFID anti-metal tag according to the present invention; wherein, 1 is a chip; 2 is a label protective layer; 3 is an antenna layer; 4 is a substrate layer, 41 is a first dielectric layer, and 42 is a second dielectric layer;
FIG. 2 is a specific structure of an antenna layer of the ultra-thin flexible UHF RFID anti-metal tag of the present invention;
FIG. 3 is a graph showing the variation of the transmission coefficient when the parameter k varies in the antenna structure of the ultra-thin flexible UHF RFID anti-metal tag of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
A flexible UHF RFID anti-metal label comprises a label protective layer 2, a label chip 1, an antenna layer 3 and a substrate layer 4 which are sequentially attached from top to bottom; the substrate layer comprises a first medium layer 41 and a second medium layer 42, the first medium layer is of a U-shaped structure with an opening at one end and is attached to the antenna layer 3, the second medium layer 42 is located in a bent U-shaped space of the first medium layer, and the tag chip 1 and the antenna layer 3 are fixed through an inverted packaging process.
The tag comprises a tag chip 1, a first dielectric layer 41, a second dielectric layer 42 and a protective layer, wherein the first dielectric layer 41 is a polymer film made of polyimide or polyethylene terephthalate, the second dielectric layer 42 is a foam dielectric layer, the first dielectric layer 41 and the second dielectric layer 42 are bonded by using a back adhesive, the tag chip 1 is wrapped by the protective layer, the antenna layer 3 is coated by the protective layer, and the protective layer is made of ink.
The thickness of the first dielectric layer is 50-125um, the length is 112.6-113.25mm, and the width is 20-21 mm; the second dielectric layer is 0.5-1mm thick, 56mm long and 20-21mm wide.
The antenna layer 3 is processed on the first medium layer 41, the antenna layer 3 comprises two functional parts, namely a radiation unit and a metal bottom plate which are etched from left to right in sequence, the middle parts of the two functional parts are connected by a connecting wire, and the radiation unit of the antenna layer 3 consists of a main radiation sheet and an electric small ring structure; the small electric ring structure is embedded into the main radiating sheet, the small electric ring structure and the main radiating sheet are connected through a non-centrosymmetric connecting line, the asymmetric connecting line is respectively positioned on the bottom edge and the right edge of the small electric ring structure, and the line width of the asymmetric connecting line is consistent with the line width of the small electric ring structure; and at the same time, the main radiating plate is provided with a U-shaped groove to increase the length of the flow path of the antenna surface.
The length of the radiating element of the antenna layer 3 is 56mm, the width of the radiating element is 20-21mm, and the length of the electrical small loop structure of the antenna layer 3 is 16-16.5mm, and the width of the electrical small loop structure is 8-8.5 mm.
The connecting wire of the antenna layer 3 on the right side can move left according to the proportion of the length of the wide side of the electric small ring structure, and the moving distance accounts for 0-0.5 of the proportion of the length of the wide side.
The metal bottom plate functional part of the antenna layer is separated by a winding groove to increase the tag gain, and the winding groove part of the metal bottom plate of the antenna layer has a short side of 12-12.5mm in the width direction and a long side of 15.6-16.1 mm; the length direction is 11.275-11.5 mm.
The antenna layer 3 and the metal bottom plate layer are made of copper or aluminum, the antenna is compounded on the first dielectric layer 41 through an etching process, and the thickness of the antenna layer is 10-16 microns.
The UHF RFID tag is characterized in that the flexible UHF RFID anti-metal tag is bonded with a metal component by using self-adhesive.
The structure of the label related to the invention is schematically shown in figure 1, and the outline dimension of the label is 56 multiplied by 20 multiplied by 0.6mm3。
The chip 1 is a Monza R6 chip of Impinj corporation, the protective layer 2 is made of ink, the ink is coated on the antenna layer 3 to prevent the antenna conductor from being oxidized, the antenna conductor used by the antenna layer 3 is copper, the copper is directly compounded on the first layer of medium, namely a polyimide film, the polyimide film is manufactured by adopting an etching process, and the thickness of the conductor is 15 microns.
Specific parameters of the antenna layer 3 are shown in table 1:
TABLE 1 antenna layer specific parameters (mm)
The chip 1 is combined with the antenna conductor reverse packaging process of the antenna layer 3, a first dielectric layer 41 of a substrate layer is a 50um polyimide film (PI, the dielectric constant is 3.5, and the loss tangent angle is 0.08), and the first dielectric layer is bent into a shape with a U-shaped inner cavity groove; meanwhile, a second layer of medium 42 foam medium layer (with the dielectric constant of 1.12 and the thickness of 0.5mm) is designed and adopted in the inner cavity, and the two medium layers are bonded by back glue. The working frequency band is 860Mhz-900Mhz, the optimal working frequency is 912Mhz, and the reading distance is 7.14 m.
Example 2
In this example 2, a Monza R6 chip from Impinj was used, and aluminum was used as the antenna conductor. Parameters in the antenna structure were varied as shown in table 2.
TABLE 2 antenna layer specific parameters (mm)
The other steps were the same as in example 1. The coating properties obtained are close to those of example 1.
Claims (9)
1. The flexible UHF RFID anti-metal tag is characterized by comprising a tag protective layer (2), a tag chip (1), an antenna layer (3) and a substrate layer (4) which are sequentially attached from top to bottom; the base plate layer comprises a first medium layer (41) and a second medium layer (42), the first medium layer is of a U-shaped structure with an opening at one end and is attached to the antenna layer (3), the second medium layer (42) is located in a bent U-shaped space of the first medium layer, the tag chip (1) and the antenna layer (3) are fixed through an inverted packaging process, the antenna layer (3) is processed on the first medium layer (41), the antenna layer (3) comprises a radiation unit and a metal bottom plate, the radiation unit and the metal bottom plate are sequentially etched from left to right and are connected through a connecting wire, and the radiation unit of the antenna layer (3) is composed of a main radiation sheet and an electric small ring structure; the small electric ring structure is embedded into the main radiating sheet, the small electric ring structure and the main radiating sheet are connected through a non-centrosymmetric connecting line, the asymmetric connecting line is respectively positioned on the bottom edge and the right edge of the small electric ring structure, and the line width of the asymmetric connecting line is consistent with the line width of the small electric ring structure; meanwhile, a U-shaped groove is formed in the main radiating sheet to increase the length of a flow path on the surface of the antenna; the first dielectric layer (41) is a polymer film, the polymer film is made of polyimide or polyethylene terephthalate, the second dielectric layer (42) is a foam dielectric layer, and the first dielectric layer (41) and the second dielectric layer (42) are bonded by using a back adhesive.
2. The flexible UHF RFID tag of claim 1, further comprising a protective layer wrapping the tag chip (1), wherein the protective layer is coated on the antenna layer (3), and the material of the protective layer is ink.
3. The flexible UHF RFID tag of claim 1 or 2, wherein the first dielectric layer has a thickness of 50-125um, a length of 112.6-113.25mm, and a width of 20-21 mm; the second dielectric layer is 0.5-1mm thick, 56mm long and 20-21mm wide.
4. The flexible UHF RFID anti-metal tag of claim 1, wherein the radiating element length of the antenna layer (3) is 56mm and the width is 20-21mm, and the electrical small loop structure length of the antenna layer (3) is 16-16.5mm and the width is 8-8.5 mm.
5. The flexible UHF RFID tag of claim 4, wherein the connecting line of the antenna layer (3) on the right can be shifted to the left in proportion to the length of the wide side of the electrical small loop structure, and the moving distance is 0-0.5 in proportion to the length of the wide side.
6. A flexible UHF RFID metal resistant tag of claim 3, wherein the metal back plane functional portion of the antenna layer is separated by a meandering slot to increase tag gain, the meandering slot portion of the metal back plane of the antenna layer having a width direction short side of 12-12.5mm and a long side of 15.6-16.1 mm; the length direction is 11.275-11.5 mm.
7. The flexible UHF RFID anti-metal tag of claim 1, wherein the material of the antenna layer (3) and the metal bottom plate layer is copper or aluminum, the antenna is compounded on the first dielectric layer (41) by using an etching process, and the thickness of the antenna layer is 10-16 um.
8. The flexible UHF RFID anti-metal tag of claim 1, wherein the flexible UHF RFID anti-metal tag is adhered to the metal member with a non-setting adhesive.
9. A design and verification method of a flexible UHF RFID anti-metal tag comprises the following steps: s1, determining the material and the optimal parameters of the flexible UHF RFID anti-metal label according to any one of the claims 1-8 by utilizing HFSS or CST optimization of electromagnetic simulation software, and manufacturing the flexible UHF RFID anti-metal label; s2, connecting the tag force reader with the flexible UHF RFID anti-metal label and collecting the performance parameters of the flexible UHF RFID anti-metal label until the flexible UHF RFID anti-metal label obtains the optimal reading distance and reads information.
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| CN201811449715.XA CN109713427B (en) | 2018-11-29 | 2018-11-29 | Ultra-thin flexible UHF RFID anti-metal label antenna |
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| CN201811449715.XA CN109713427B (en) | 2018-11-29 | 2018-11-29 | Ultra-thin flexible UHF RFID anti-metal label antenna |
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| CN109713427B true CN109713427B (en) | 2021-01-29 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110443339B (en) * | 2019-07-11 | 2023-04-14 | 永道射频技术股份有限公司 | Anti-counterfeit label applied to bottled engine oil |
| CN111799554B (en) * | 2020-07-08 | 2021-12-31 | 中国人民解放军陆军装甲兵学院 | Flexible anti-metal RFID (radio frequency identification) tag antenna and impedance analysis method |
| CN111882019A (en) * | 2020-07-25 | 2020-11-03 | 北京国金源富科技有限公司 | Electronic tag suitable for inside cable |
| CN112216969B (en) * | 2020-09-22 | 2021-12-03 | 天津大学 | Compact UHF RFID folding anti-metal tag antenna |
| CN113314829A (en) * | 2021-06-18 | 2021-08-27 | 合肥工业大学 | Radio frequency identification ultrahigh frequency band tag antenna applied to metal environment |
| TWI825652B (en) | 2022-04-01 | 2023-12-11 | 肥特補科技股份有限公司 | Separator, its manufacturing method and UHF RFID tag |
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| CN102147877A (en) * | 2011-03-29 | 2011-08-10 | 成都鼎格科技有限公司 | Electronic tag |
| CN207149682U (en) * | 2017-04-26 | 2018-03-27 | 刘慧君 | A kind of ultrahigh frequency electronic tag antenna |
| CN207517048U (en) * | 2017-10-30 | 2018-06-19 | 杭州思创汇联科技有限公司 | A kind of flexibility RFID anti-metal tags |
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| CN201278365Y (en) * | 2008-09-24 | 2009-07-22 | 中兴通讯股份有限公司 | Electronic label and antenna thereof |
| JP2013003953A (en) * | 2011-06-20 | 2013-01-07 | Toppan Printing Co Ltd | Rfid tag |
| CN102955969A (en) * | 2011-08-17 | 2013-03-06 | 上海铁勋智能识别***有限公司 | Ultrathin, flexible and anti-metallic ultrahigh-frequency electronic tag |
| CN102799932A (en) * | 2012-05-09 | 2012-11-28 | 武汉威杜信息材料科技有限公司 | Method for manufacturing disposable RFID (Radio Frequency Identification) tag |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102147877A (en) * | 2011-03-29 | 2011-08-10 | 成都鼎格科技有限公司 | Electronic tag |
| CN207149682U (en) * | 2017-04-26 | 2018-03-27 | 刘慧君 | A kind of ultrahigh frequency electronic tag antenna |
| CN207517048U (en) * | 2017-10-30 | 2018-06-19 | 杭州思创汇联科技有限公司 | A kind of flexibility RFID anti-metal tags |
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