WO2021189228A1 - Rfid tag - Google Patents

Rfid tag Download PDF

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Publication number
WO2021189228A1
WO2021189228A1 PCT/CN2020/080797 CN2020080797W WO2021189228A1 WO 2021189228 A1 WO2021189228 A1 WO 2021189228A1 CN 2020080797 W CN2020080797 W CN 2020080797W WO 2021189228 A1 WO2021189228 A1 WO 2021189228A1
Authority
WO
WIPO (PCT)
Prior art keywords
substrate
rfid tag
antenna
ground plane
dielectric layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2020/080797
Other languages
French (fr)
Other versions
WO2021189228A8 (en
Inventor
Will DENG
Eveliina KOSKI
Miika Pylvanainen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Confidex Oy
Original Assignee
Confidex Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Confidex Oy filed Critical Confidex Oy
Priority to CN202080098626.4A priority Critical patent/CN115298666A/en
Priority to EP20927142.8A priority patent/EP4128046A4/en
Priority to BR112022018373A priority patent/BR112022018373A2/en
Priority to PCT/CN2020/080797 priority patent/WO2021189228A1/en
Priority to US17/910,172 priority patent/US12299516B2/en
Publication of WO2021189228A1 publication Critical patent/WO2021189228A1/en
Publication of WO2021189228A8 publication Critical patent/WO2021189228A8/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/0772—Physical layout of the record carrier
    • G06K19/07722—Physical layout of the record carrier the record carrier being multilayered, e.g. laminated sheets
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07771—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07773—Antenna details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna

Definitions

  • the present invention relates to an RFID tag having a front side and a back side, the RFID tag comprising an antenna and an integrated circuit on a chip.
  • An object of the present invention to provide an RFID tag so as to solve the above problems.
  • the objects of the invention are achieved by an RFID tag which is characterized by what is stated in the independent claim.
  • the preferred embodiments of the invention are disclosed in the dependent claims.
  • An advantage of the RFID tag of the invention is that it works on every surface, i.e. it is not sensitive to the material to which it is attached.
  • the same tag works on different dielectric surfaces such as water tanks, plastics, or coated metal.
  • the back side of the tag works both as a shielding ground and as a part of the antenna.
  • the tag has a narrower frequency band since a stabile radio frequency band can be obtained without increasing the band width.
  • the tag can be encoded and printed simultaneously.
  • the antenna may be long but it does not make the tag larger.
  • the RFID tag is usually a flat structure that has a front side and a back side.
  • the RFID tag may comprise several sheet-like layers on top of each other.
  • the layers are described in this text as from the front side.
  • the layers may be thin and flexible.
  • the layer on the front side may have a printable surface.
  • the printable surface means in this context that the surface can be printed by a printer-encoder that is designed for printing RFID tags and the print quality is sufficient e.g. for flawless barcodes.
  • the printable surface may be a separate layer, such as a paper or plastic layer, or it may be a layer which already has a certain task in the structure and it has the printable surface as an excess feature, i.e. there is no separate layer for printing. However, the printable surface may be covered with a lacquer or a coating.
  • the tag may be a label.
  • the label may be thin and conformable since it has to go through a printer-encoder.
  • the label may have adhesive, such as pressure sensitive adhesive, on its back side.
  • the RFID tag comprises an antenna and an integrated circuit on a chip that is electrically connected to the antenna.
  • the antenna may work at UHF frequencies be-tween 850 MHz and 960 MHz.
  • the RFID tag (radio frequency identification tag) comprises a dielectric sub-strate, a dielectric layer and a ground plane under the dielectric substrate.
  • the ground plane is on the underside of the substrate, or it is located on its own ground plane substrate under the dielectric substrate.
  • the dielectric substrate and the dielectric layer may be of plastic material.
  • the dielectric substrate may be of polyester, for exam-ple. Paper may be used instead of plastic materials.
  • the dielectric layer may be of polypropylene, for example.
  • the dielectric layer is preferably made of a foam, i.e. a lightweight cellular material wherein bubbles are formed during manufacturing.
  • the dielectric layer may be a dielectric adhesive.
  • the substrate has a first side and a second side.
  • the substrate comprises an antenna on the first side of the substrate.
  • the substrate may comprise a ground plane on the second side of the substrate.
  • the antenna and the ground plane may be etched or printed to the substrate but on the opposite sides, or they may be etched or printed on their own substrates.
  • the antenna and the ground plane are configured to overlap. They may over-lap in such a manner that the antenna on the first side of the substrate extends at least partially on top of the ground plane on the second side of the substrate, or the antenna on the dielectric substrate extends at least partially on top of the ground plane on its own ground plane substrate.
  • the dielectric substrate is folded over the dielectric layer in such a manner that the ground plane is configured to cover the antenna on the back side of the RFID tag.
  • the ground plane may cover the whole back side of the RFID tag.
  • the ground plane stabilizes the radiation of the antenna.
  • the substrate may be folded over one edge of the dielectric layer, or it may be folded over two opposite edges of the dielectric layer.
  • the antenna and the ground plane are coupled through a capacitive coupling.
  • the ground plane can work as a shielding ground and a radiating element together with the antenna.
  • the RFID tags may be printed and encoded simultaneously since near field communication of the antenna by the ground plane from backside of the RFID transponder is enabled.
  • the RFID tags may be manufactured by a roll-to-roll process.
  • the RFID tags may be adhesively attached to a release liner. They may be printed one after the other when they are on a surface of a web or a sheet.
  • Figure 1 shows one web comprising successive RFID tags from above
  • Figure 2 shows another web comprising successive RFID tags from above
  • Figure 3a shows a cross section of RFID tags of Fig. 1;
  • Figure 3b shows another cross section of RFID tags of Fig. 1;
  • Figure 4 shows a cross section of RFID tags of Fig. 2;
  • Figure 5 shows a substrate from above.
  • Figure 1 shows a web 10 comprising successive RFID tags 11 on a release liner 9. Between successive RFID tags 11 there may be spacers 12 that prevent a printing head of a printer-encoder to fall into a gap between the successive RFID tags 11.
  • Figure 2 shows a web 10 comprising successive RFID tags 11 on a release liner 9. Between successive RFID tags 11 there may be spacers 12 that prevent a printing head of a printer-encoder to fall into a gap between the successive RFID tags 11.
  • FIG. 3a shows one possible structure of an RFID tag 11.
  • the RFID tag 11 comprises a substrate 1, a dielectric layer 7 and a face layer 8.
  • the RFID tag 11 may be attached to a release liner 9.
  • the substrate 1, the dielectric layer 7 and the face layer 8 may be attached together by an adhesive.
  • Dashed lines in Fig. 3 denote possible loca-tions where adhesive is used.
  • the substrate 1 comprises an antenna 2, a ground plane 3 and a chip 4.
  • the chip is electrically connected to the antenna 2.
  • the antenna 2 and the ground plane 3 are on the opposite sides of the substrate 1.
  • the substrate 1 is folded over the edge 7a of the dielectric layer 7 in such a manner that the ground plane 3 is configured to cover the antenna 2 on the back side of the RFID tag.
  • the face layer 8 may be omitted in some cases.
  • the side of the substrate 1 that faces to the front side of the RFID tag 11 may be a printable surface. In that case the substrate must be selected in such a manner that the prerequisites of the printable surface are fulfilled.
  • the ground plane 3 may be on its own ground plane substrate 12 under the dielectric substrate 1 in some cases as shown in Fig. 3b.
  • Fig. 4 shows another possible structure of an RFID tag 11.
  • the RFID tag comprises a substrate 1, a dielectric layer 7 and a face layer 8.
  • the RFID tag may be attached to a release liner 9.
  • the substrate 1, the dielectric layer 7 and the face layer 8 may be attached together by an adhesive.
  • Dashed lines in Fig. 4 denote possible locations where adhesive is used.
  • the substrate 1 comprises an antenna 2, a ground plane 3 and a chip 4.
  • the chip is electrically connected to the antenna 2.
  • the antenna 2 and the ground plane 3 are on the opposite sides of the substrate 1.
  • the substrate 1 is folded over two opposite edges 7a, 7b of the dielectric layer 7 in such a manner that the antenna 2 coils around the dielectric layer 7.
  • the ground plane 3 is configured to cover the antenna 2 on the back side of the RFID tag.
  • the face layer 8 may be omitted in some cases.
  • the side of the substrate 1 that faces to the front side of the RFID tag 11 may be a printable surface. In that case the substrate must be selected in such a manner that the prerequisites of the printable surface are fulfilled.
  • the ground plane 3 may be on its own ground plane substrate under the dielectric substrate 1 in some cases.
  • Figure 5 shows an example of the first side of a substrate 1 when the sub-strate 1 is in a straight form.
  • the substrate comprises an antenna 2 on the first side and a ground plane 3 on the second side (dashed line) .
  • the antenna 2 and the ground plane 3 may be formed by etching or printing.
  • the antenna 2 and the ground plane 3 may be of a metallic material, such as aluminium or copper, or they may be of an electrically conductive polymer.
  • the region 6 is only schematically shown in Fig. 5 and thus, its length may vary depending on where the substrate 1 is used.
  • the substrate 1 further comprises an integrated circuit on a chip 4 that is electrically connected to the antenna 2 by conductors.
  • the conductors of the chip 4 may be formed in the same way as the antenna 2 and the ground plane 3.
  • the con-ductors are formed by removing antenna material from spaces 5.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • Details Of Aerials (AREA)

Abstract

The present invention relates to an RFID tag (11) that has a front side and a back side. The RFID tag (11) comprises a printable surface (13), an antenna (2) and an integrated circuit on a chip (4) electrically connected to the antenna (2). The RFID tag comprises a dielectric substrate (1), a dielectric layer (7) and a ground plane (3) under the substrate (1). The substrate (1) has a first side and a second side. The substrate (1) comprises an antenna (2) on the first side of the substrate (1). The antenna (2) and the ground plane (3) are configured to overlap. The substrate (1) is folded over at least one edge (7a; 7b) of the dielectric layer (7) in such a manner that the ground plane (3) is configured to cover the antenna (2) on the back side of the RFID tag (11).

Description

RFID TAG FIELD OF THE INVENTION
The present invention relates to an RFID tag having a front side and a back side, the RFID tag comprising an antenna and an integrated circuit on a chip.
BACKGROUND OF THE INVENTION
One of the problems associated with the above tag is that it does not neces-sarily work on every surface. Another problem is that the tags cannot be encoded and printed simultaneously. Still another problem is that the antenna must be designed ac-cording to a need and it may be longer than desired.
BRIEF DESCRIPTION OF THE INVENTION
An object of the present invention to provide an RFID tag so as to solve the above problems. The objects of the invention are achieved by an RFID tag which is characterized by what is stated in the independent claim. The preferred embodiments of the invention are disclosed in the dependent claims.
An advantage of the RFID tag of the invention is that it works on every surface, i.e. it is not sensitive to the material to which it is attached. The same tag works on different dielectric surfaces such as water tanks, plastics, or coated metal. The back side of the tag works both as a shielding ground and as a part of the antenna. The tag has a narrower frequency band since a stabile radio frequency band can be obtained without increasing the band width.
The tag can be encoded and printed simultaneously. The antenna may be long but it does not make the tag larger.
The RFID tag is usually a flat structure that has a front side and a back side. The RFID tag may comprise several sheet-like layers on top of each other. The layers are described in this text as from the front side. The layers may be thin and flexible. The layer on the front side may have a printable surface. The printable surface means in this context that the surface can be printed by a printer-encoder that is designed for printing RFID tags and the print quality is sufficient e.g. for flawless barcodes. The printable surface may be a separate layer, such as a paper or plastic layer, or it may be a layer which already has a certain task in the structure and it has the printable surface as an excess feature, i.e. there is no separate layer for printing. However, the printable surface may be covered with a lacquer or a coating.
The tag may be a label. The label may be thin and conformable since it has to go through a printer-encoder. The label may have adhesive, such as pressure sensitive  adhesive, on its back side.
The RFID tag comprises an antenna and an integrated circuit on a chip that is electrically connected to the antenna. The antenna may work at UHF frequencies be-tween 850 MHz and 960 MHz.
The RFID tag (radio frequency identification tag) comprises a dielectric sub-strate, a dielectric layer and a ground plane under the dielectric substrate. In other words, the ground plane is on the underside of the substrate, or it is located on its own ground plane substrate under the dielectric substrate. The dielectric substrate and the dielectric layer may be of plastic material. The dielectric substrate may be of polyester, for exam-ple. Paper may be used instead of plastic materials.
The dielectric layer may be of polypropylene, for example. The dielectric layer is preferably made of a foam, i.e. a lightweight cellular material wherein bubbles are formed during manufacturing. Instead of plastic material the dielectric layer may be a dielectric adhesive.
The substrate has a first side and a second side. The substrate comprises an antenna on the first side of the substrate. The substrate may comprise a ground plane on the second side of the substrate. The antenna and the ground plane may be etched or printed to the substrate but on the opposite sides, or they may be etched or printed on their own substrates.
The antenna and the ground plane are configured to overlap. They may over-lap in such a manner that the antenna on the first side of the substrate extends at least partially on top of the ground plane on the second side of the substrate, or the antenna on the dielectric substrate extends at least partially on top of the ground plane on its own ground plane substrate. In the ready RFID tag the dielectric substrate is folded over the dielectric layer in such a manner that the ground plane is configured to cover the antenna on the back side of the RFID tag. The ground plane may cover the whole back side of the RFID tag. The ground plane stabilizes the radiation of the antenna.
The substrate may be folded over one edge of the dielectric layer, or it may be folded over two opposite edges of the dielectric layer. The antenna and the ground plane are coupled through a capacitive coupling. Thus, the ground plane can work as a shielding ground and a radiating element together with the antenna. The RFID tags may be printed and encoded simultaneously since near field communication of the antenna by the ground plane from backside of the RFID transponder is enabled.
The RFID tags may be manufactured by a roll-to-roll process. The RFID tags may be adhesively attached to a release liner. They may be printed one after the other when they are on a surface of a web or a sheet.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following the invention will be described in greater detail by means of preferred embodiments with reference to the attached drawings, in which
Figure 1 shows one web comprising successive RFID tags from above;
Figure 2 shows another web comprising successive RFID tags from above;
Figure 3a shows a cross section of RFID tags of Fig. 1;
Figure 3b shows another cross section of RFID tags of Fig. 1;
Figure 4 shows a cross section of RFID tags of Fig. 2;
Figure 5 shows a substrate from above.
DETAILED DESCRIPTION OF THE INVENTION
Figure 1 shows a web 10 comprising successive RFID tags 11 on a release liner 9. Between successive RFID tags 11 there may be spacers 12 that prevent a printing head of a printer-encoder to fall into a gap between the successive RFID tags 11.
It is shown in one of the RFID tags 11 where in the tag a chip 4 and an antenna 2 are located. The cross-section A-A of Fig. 1 is shown in Fig. 3.
Figure 2 shows a web 10 comprising successive RFID tags 11 on a release liner 9. Between successive RFID tags 11 there may be spacers 12 that prevent a printing head of a printer-encoder to fall into a gap between the successive RFID tags 11.
It is shown in one of the RFID tags 11 where in the tag a chip 4 and an antenna 2 are located. The cross-section A-A of Fig. 2 is shown in Fig. 4.
Figure 3a shows one possible structure of an RFID tag 11. The RFID tag 11 comprises a substrate 1, a dielectric layer 7 and a face layer 8. The RFID tag 11 may be attached to a release liner 9. The substrate 1, the dielectric layer 7 and the face layer 8 may be attached together by an adhesive. Dashed lines in Fig. 3 denote possible loca-tions where adhesive is used.
The substrate 1 comprises an antenna 2, a ground plane 3 and a chip 4. The chip is electrically connected to the antenna 2. The antenna 2 and the ground plane 3 are on the opposite sides of the substrate 1. The substrate 1 is folded over the edge 7a of the dielectric layer 7 in such a manner that the ground plane 3 is configured to cover the antenna 2 on the back side of the RFID tag.
The face layer 8 may be omitted in some cases. The side of the substrate 1 that faces to the front side of the RFID tag 11 may be a printable surface. In that case the substrate must be selected in such a manner that the prerequisites of the printable surface are fulfilled.
The ground plane 3 may be on its own ground plane substrate 12 under the  dielectric substrate 1 in some cases as shown in Fig. 3b.
Thus, it is possible that there is a tag 11 having an antenna 2 and a ground plane 3 on the same substrate 1, or there is a tag 11 having an antenna 2 and a ground plane 3 on  separate substrates  1, 12. Both above-mentioned alternatives are feasible with, or without a face layer 8.
Fig. 4 shows another possible structure of an RFID tag 11. The RFID tag comprises a substrate 1, a dielectric layer 7 and a face layer 8. The RFID tag may be attached to a release liner 9. The substrate 1, the dielectric layer 7 and the face layer 8 may be attached together by an adhesive. Dashed lines in Fig. 4 denote possible locations where adhesive is used.
The substrate 1 comprises an antenna 2, a ground plane 3 and a chip 4. The chip is electrically connected to the antenna 2. The antenna 2 and the ground plane 3 are on the opposite sides of the substrate 1. The substrate 1 is folded over two  opposite edges  7a, 7b of the dielectric layer 7 in such a manner that the antenna 2 coils around the dielectric layer 7. The ground plane 3 is configured to cover the antenna 2 on the back side of the RFID tag.
The face layer 8 may be omitted in some cases. The side of the substrate 1 that faces to the front side of the RFID tag 11 may be a printable surface. In that case the substrate must be selected in such a manner that the prerequisites of the printable surface are fulfilled.
The ground plane 3 may be on its own ground plane substrate under the dielectric substrate 1 in some cases.
Thus, it is possible that there is a tag 11 having an antenna 2 and a ground plane 3 on the same substrate 1, or there is a tag 11 having an antenna 2 and a ground plane 3 on  separate substrates  1, 12 as shown in Fig. 3b. The same detail can also be applied to the structure of Fig. 4. Both above-mentioned alternatives are feasible with, or without a face layer 8.
Figure 5 shows an example of the first side of a substrate 1 when the sub-strate 1 is in a straight form. The substrate comprises an antenna 2 on the first side and a ground plane 3 on the second side (dashed line) . The antenna 2 and the ground plane 3 may be formed by etching or printing. The antenna 2 and the ground plane 3 may be of a metallic material, such as aluminium or copper, or they may be of an electrically conductive polymer.
The antenna 2 and the ground plane 3 overlap in a region 6. The region 6 is only schematically shown in Fig. 5 and thus, its length may vary depending on where the substrate 1 is used.
The substrate 1 further comprises an integrated circuit on a chip 4 that is electrically connected to the antenna 2 by conductors. The conductors of the chip 4 may be formed in the same way as the antenna 2 and the ground plane 3. In Fig. 5 the con-ductors are formed by removing antenna material from spaces 5.
It will be obvious to a person skilled in the art that, as the technology ad-vances, the inventive concept can be implemented in various ways. The invention and its embodiments are not limited to the examples described above but may vary within the scope of the claims.

Claims (8)

  1. An RFID tag (11) having a front side and a back side, the RFID tag (11) comprising a printable surface (13) , an antenna (2) and an integrated circuit on a chip (4) electrically connected to the antenna (2) , characterized in that the RFID tag com-prises a dielectric substrate (1) , a dielectric layer (7) and a ground plane (3) under the substrate (1) , the substrate (1) having a first side and a second side, the substrate (1) comprises an antenna (2) on the first side of the substrate (1) , the antenna (2) and the ground plane (3) are configured to overlap, the substrate (1) is folded over at least one edge (7a; 7b) of the dielectric layer (7) in such a manner that the ground plane (3) is configured to cover the antenna (2) on the back side of the RFID tag (11) .
  2. The RFID tag according to claim 1, characterized in that the substrate (1) comprises a ground plane (3) on the second side of the substrate (1) .
  3. The RFID tag according to claim 1, characterized in that the ground plane (3) is located on its own ground plane substrate (12) .
  4. The RFID tag according to any preceding claim, characterized in that the substrate is folded over two opposite edges (7a, 7b) of the dielectric layer (7) .
  5. The RFID tag according to any preceding claim, characterized in that the dielectric layer (7) is a foam.
  6. The RFID tag according to any preceding claim, characterized in that the printable surface (13) is a paper or plastic layer.
  7. The RFID tag according to any preceding claim, characterized in that the printable surface (13) is the second side of the substrate (1) facing to the front side of the RFID tag (11) .
  8. The RFID tag according to claim 7, characterized in that the second side of the substrate (1) comprises a lacquer or a coating.
PCT/CN2020/080797 2020-03-24 2020-03-24 Rfid tag Ceased WO2021189228A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN202080098626.4A CN115298666A (en) 2020-03-24 2020-03-24 RFID tag
EP20927142.8A EP4128046A4 (en) 2020-03-24 2020-03-24 Rfid tag
BR112022018373A BR112022018373A2 (en) 2020-03-24 2020-03-24 RFID TAG
PCT/CN2020/080797 WO2021189228A1 (en) 2020-03-24 2020-03-24 Rfid tag
US17/910,172 US12299516B2 (en) 2020-03-24 2020-03-24 RFID tag

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/080797 WO2021189228A1 (en) 2020-03-24 2020-03-24 Rfid tag

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WO2021189228A8 WO2021189228A8 (en) 2021-11-04

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CN (1) CN115298666A (en)
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US12299516B2 (en) 2025-05-13
CN115298666A (en) 2022-11-04
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US20230351140A1 (en) 2023-11-02
BR112022018373A2 (en) 2022-11-08
EP4128046A4 (en) 2023-12-20

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