EP1269412A1 - Rfid label with an element for regulating the resonance frequency - Google Patents

Rfid label with an element for regulating the resonance frequency

Info

Publication number
EP1269412A1
EP1269412A1 EP20010962432 EP01962432A EP1269412A1 EP 1269412 A1 EP1269412 A1 EP 1269412A1 EP 20010962432 EP20010962432 EP 20010962432 EP 01962432 A EP01962432 A EP 01962432A EP 1269412 A1 EP1269412 A1 EP 1269412A1
Authority
EP
European Patent Office
Prior art keywords
rfid label
conductive
characterized
substrate
label
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.)
Withdrawn
Application number
EP20010962432
Other languages
German (de)
French (fr)
Inventor
Philipp Müller
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.)
Lucatron AG
Original Assignee
Lucatron AG
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
Priority to CH5942000 priority Critical
Priority to CH594002000 priority
Application filed by Lucatron AG filed Critical Lucatron AG
Priority to PCT/CH2001/000085 priority patent/WO2001073685A1/en
Publication of EP1269412A1 publication Critical patent/EP1269412A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/22Electrical actuation
    • G08B13/24Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2414Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record 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
    • G06K19/067Record 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
    • G06K19/0672Record 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 resonating marks
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record 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
    • G06K19/067Record 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
    • G06K19/07Record 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
    • G06K19/0723Record 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
    • G06K19/0726Record 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 the arrangement including a circuit for tuning the resonance frequency of an antenna on the record carrier
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record 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
    • G06K19/067Record 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
    • G06K19/07Record 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
    • G06K19/077Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749Constructional 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
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/22Electrical actuation
    • G08B13/24Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2405Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used
    • G08B13/2414Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags
    • G08B13/2417Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting characterised by the tag technology used using inductive tags having a radio frequency identification chip
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/22Electrical actuation
    • G08B13/24Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2402Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
    • G08B13/2428Tag details
    • G08B13/2431Tag circuit details

Abstract

The invention relates to an RFID label comprising a resonant circuit consisting of a coil and a capacitor. Said RFID label is provided with an additional element (13, 17, 20, 21) for regulating the resonance frequency of the resonant circuit, this element being applied to the surface of the RFID label after production of the same. The additional element can be especially, a sticker with a conductive layer, which is stuck in such a way that it at least partially overlaps individual conductive surfaces of the label in order to produce an additional capacitance or which is simply stuck into the coil in order to reduce the effective inductance of the coil. Alternatively, the element can be formed by a layer with high relative permittivity which is applied between two conductive surfaces.

Description

DESCRIPTION

TITLE

RFID-LABEL

TECHNICAL FIELD

The present invention relates to a RFID label according to the preamble of claim 1. The abbreviation "RFID" stands for the English term "Radio Frequency Identification"

RFID labels include, as considered here, in general, on a thin plastic substrate an electrical resonant circuit with a coil and a capacitor as well as a very small semiconductor integrated circuit (chip), which gives a certain intelligence the label The coil acts as an antenna, so can that the label lying on its in "Radιowellen" -Bereιch, determined by the tank circuit resonance frequency communicate so to speak, "radio" to a remote transmitting and receiving station the benotigte for operation of the semiconductor circuit energy involves the label from the data received via the coil antenna outer field so the label disposes itself has not its own energy source

RFID labels can be because of their "intelligence" especially used for goods identification, access-security element in a complex of buildings or for example as Skihft ticket

RFID labels are subject along with their associated transmitting and receiving stations usually strict harmful regulations that eg allow only very narrowly defined for its operation frequency bands Such gladly chosen for RFID labels frequency band is eg 13560 MHz, the width this volume amounts to only +/- 7 kHz

In terms of RFID labels in the training described now there is the difficulty of adjusting the resonant frequency of the label in particular at one of the large-scale production precisely in such a narrow range and to keep

STATE OF THE ART

Such Vorπchtung is known in different embodiments from the prior art

In terms of a subsequent correction of a small hidden in the desired frequency range resonant frequency different methods of "trimming" of the resonance frequency are already known

Such a known trimming method is the z B Einkurzen a capacitor with the aid of a laser (cf. US 3,947,934) or a punching or cutting tool (see WO 89/05984) As a result, the surface of the capacitor is reduced and thus reduces the capacity by the reduction in capacitance, the resonant frequency of the resonant circuit and is influenced in such a manner that the resonance frequency is increased

Another known technique is the melting of the Kunsstoffolie between the capacitor surfaces Here, the distance between the capacitor plates is shortened, causing an increase in the capacitance of the capacitor and thus causing a reduction in the resonant frequency of the resonant circuit

Both known techniques have various drawbacks For example, the use of expensive Prazisionsmaschinen necessary, which significantly increase the cost of the manufacturing process of such Labein is also the risk of the surface of injury in tailoring the capacitor plates on the film The known techniques are not readily with the required Gewindigkeit in mass production of the label in a continuous flow process ausfuhrbar oF tHE INVENTION

It is therefore an object of the invention to indicate how the resonance frequency of the RFID labels can also be adjusted so that it is then in a certain frequency band In addition, this should be mechanically simpler and thus more economical than the known techniques

This object is solved in that the label is provided with a subsequently applied to its surface additional element which changes the resonant frequency of the resonant circuit and brings to the desired range

The advantages resulting from the invention are particularly to see that as an additional element simply a label with a conductive layer or an order can be used from a composition having a high dielectric constant, the surface and / or material effect the desired correction of the resonance frequency, and that can be applied also industrially very easily and accurately and at high production speeds on the otherwise already feπtg ausgebildten label

Also the extent of the frequency change caused by the additional element in comparison with the aforementioned known trimming method may be selected absolutely large on the inventive type, whereby the obtainable accuracy of the frequency setting is increased

ACCORDING a preferred Ausfuhrungsart is a sticker with a conductive layer and an adhesive layer in order to increase the effective capacitance of the resonant circuit in at least partial Uber cover with at least two conductive surfaces with different potentials, which are on the same substrate, attached He can in this case on the same substrate side as this conductive surfaces to be quasi applied directly on them, whereby for example, only the adhesive layer as an insulating as well as a dielectric layer It acts on the other hand, however, also be mounted on the opposite side of the substrate, wherein in addition the substrate has an insulating effect, as well as the dielectric of the sticker is particularly effective if the conductive surfaces to which it is applied are chosen such that lie at least approximately on the potential of the two capacitor plates Usually, these are those surfaces which Verweij for the contacting of the semiconductor circuit have a friend

Basically, a sticker could also having a conductive surface on a substrate side are electrically connected and the rest be arranged such that it is connected to another conductive surface on the opposite substrate side in at least partial Uber cover This also results in a Kapazitatserhohung, provided that the corresponding conductive flat are not on the same electrical potential

In another preferred embodiment, a label with a conductive layer in the region disposed within the coil for the purpose of a reduction in the effective inductance of the resonant circuit result, the magnetic field within the coil is influenced in such a way that the inductance is decreased and hence a desired Frequenzerhohung results particularly effective is this measure if the label is placed within the coil disposed opposite the center because here the magnetic flux is denser than in the center

Instead of or in addition to a sticker can be used as an additional element according to the invention, a local order from an initially liquid or pasty, later drying or hardening material, which has a high Dielektπzitatkonstante be made, wherein the local order of the material in the intermediate space between two arranging conductive surfaces with different electrical potential is an add-pending dielectric between the conductors is provided by such an order that a Kapazitatserhohung and thus a lowering of the frequency of the resonant circuit result has the paste is easy to install between the two conductors In addition, the dielectric of the paste can vary depending on the desired frequency adjustment be set

Further embodiments result from the dependent claims and the following description of exemplary embodiments

BRIEF EXPLANATION OF THE FIGURES

The invention will be explained below with reference to exemplary embodiments in conjunction with the drawing near 1 shows a plan view of an RFID label with an additionally attached label,

Figure 2 shows a plan view of an RFID label with a sticker inside the coil,

Fig 3 each in section under A) - C) various types, such as those labels can be arranged, and Figure 4 also in section an alternative solution with an additionally applied local order of a material having a high dielectric constant

WAYS OF CARRYING OUT THE INVENTION

In Figure 1, 1 designates a plastic film referred to, which for example is made of polyester, and which is provided on both sides with conductive surfaces, preferably of aluminum, from the conductive surfaces are two parallel tracks 2 and 3, a spool 4, a first Eckflache 5, a first contact surface 6 and a connecting piece 7 on the substrate front side arranged on these conductor tracks stπchliert executed 8 and 9, in contrast, are arranged on the substrate-rear side on the substrate rear side is essentially congruent with the first Eckflache 5, also a second Eckflache 5 'and substantially congruent with the first contact surface 6 may also have a second contact surface 6' formed between the first 5 and the second Eckflache 5 'is by means of a so-called Verkπmpung a first via hole 9 is present another such plated-through hole 10 is also provided between the two contact surfaces 6 and 6 'exist

The coil 4 is connected with its one end to the conductor track 3 and tastes with its other end in the first Eckflache 5 From there, the electrical connection runs further over the plated-through hole 9 to the second Eckfache 5 ', via the conductor 8 to the other contact surface 6 'and from there to the conductor track 14 in the area of ​​their free ends, the conductor tracks 3 and 14 via cross on different sides of the substrate and form the plates of a capacitor 11 in turn forms, together with the coil 4 a resonant circuit

Over the via 10 and the connection piece 7, the conductor track located on the substrate rear side 14 and the rear capacitor plate is connected to the located on the substrate front side conductor 2 which accordingly also has the potential of the rear condenser plate 3 In contrast, the conductor, the potential the front plate condenser connected to the two conductor tracks 2 and 3 and thus applied with the voltage of the capacitor 11 is a semiconductor integrated circuit or chip 12

The shown in Figure 1 RFID label is also trimmed and through a sticker 13 which is bonded in partial Uber register with the surfaces 2 and 3. The surfaces 2 and 3 are for this purpose an extra long enough formed The label 13 has a with an adhesive layer 16 provided conductive layer 15 for example from Alumininum on (see Figure 3 a or B) and causes, depending on the size of the conductive layer or its Uber coverage with the conductive surfaces 2 and 3 of the label, locally an additional capacitance which of the capacity resonant circuit increases This in turn has a frequency reduction of the resonant circuit 1 result

The Tπmmen of the resonant circuit with the sticker 13 can in principle be after production of the label as such, first the actual frequency of the oscillating circuit is determined, for example by frequency measuring cell the actual frequency is then compared with a predetermined desired frequency and a correction factor therefrom On the basis of this correction factor determined the size of the sticker 13 is selected,

The label 13 can be applied either directly to the two conductive surfaces 2 or 3, wherein only its adhesive layer insulating against these surfaces and acts as Dielektikum or it may be applied to the opposite side of the substrate, wherein the substrate additionally insulated and forms a dielectric

In Figure 2, a further possibility of a frequency matching the resonant circuit 1 is shown a label 21 with a conductive, eg existing again aluminum layer is here just anywhere applied to a free surface within the coil 4 without Uber registry with one of the conductive surfaces through the label 21, the magnetic field within the coil 4 changes More specifically, by the sticker 21, the inductance L of the coil reduces this has the effect of increasing the sticker 21 on the resonant frequency of the oscillating circuit 1 is preferably offset from the coil center to install, because the effect on the magnetic flux in this the case is large, than than in the center of the spool 4. Figure 3 shows at a and B, the two ways previously described in section, of a label 13 kapazitatserhohend to install in wenistens partially Uber cover with two conductor tracks 2 and 3, image a to the section II of Figure 1 corresponds to and the sticker 13 on the Substra t-front side, ie on the same side as the two interconnects 2 and 3 shows at 15 the conductive layer of the label 13 is designated with 16 its insulating adhesive layer Panel B shows the sticker 13 on the substrate rear side, the conductive traces 2 and 3 with respect to since the substrate acts additionally insulating here, the label could be 13 also applied directly to the plastic film 1 without the adhesive layer 16, for example by a heat-sealing

In section C is a label 17 with a conductive layer 18 and a conductive adhesive layer 19, and conductively connected to a first conductive surface on the same side of the substrate to another conductive surface arranged on the opposite side of the substrate and at different potentials, such as the first surface is brought into wengistens partially cover Uber It is understood that also in this case the label 17 causes additional capacitance between the two conductive surfaces shown

In Figure 4, a local order 20 between two conducting surfaces is shown with a different potential on the same substrate side of the local job 20 is made of a z B LIQUID applied mass at a high Dielektπzitazskonstant ε, preferably in the range of ε r is 2 - 10, with these mass, later solidified and / or dried and / or cured the order caused by the high dielectric constant of the composition used as the above-described sticker a local Kapazitatserhohung between the two conductor tracks, which increases the total capacity of the resonant circuit and affects degrading at its resonant frequency it should be understood that the extent of the Kapazitatsanderung is determined here primarily by the length of the order 20 along the two tracks

As for the extent of Kapazitatsanderung, this depends basically still on the position that or for the sticker to the local job is chosen most pronounced is when the conductive surfaces with which the label is placed in at least partially Uber coverage, or between which the applicator is mounted, are at different possible potential at a RFID label of the type considered here the LARGEST potential difference between the plates of the resonant circuit capacitor 1 1 arises for this reason, the label 13 of Figure 1 and transversely over the two interconnects 2 and 3 applied which have these maximum potential difference

On the other hand it can also be advantaget to apply a label or order in an area of ​​the label on which it is less effective, such B between two coil turns, the sticker or the order to make large or long to compensate for this in this way can be anywhere a desired Frequenztnmmung possibly even more precise and accomplished with "coarse" means the same considerations also determine to on which side of the substrate is best to place a sticker

NAME LIST

1 plastic

Two conductive tracks

3 conductor paths

4 coil

5 first corner surface

5 'second corner surface

6 contact surface

6 'contact surface

7 Connector

8 Leite train

9 via

10 via

1 1 capacitor

12 chip

13 stickers

14 interconnect

Conductive layer 15

16 insulating adhesive layer

17 stickers

Conductive layer 18

19 conductive adhesive layer

20 local order

21 stickers

Claims

1 RFID labels having a substrate made of a plastic film and with conductive surfaces on the front and the back of the substrate, wherein the conductive surfaces form an electrical oscillation circuit, among other things, which has a coil (4) having at least one coil and a capacitor having a first capacitor plate on the substrate front side and a second capacitor plate on the substrate back side cover, and wherein a further conductive area on the substrate front side (2) is arranged, which is connected to the second capacitor plate on the substrate back side conductive, characterized in αass it is provided with a nachtraglich applied to its surface additional element (13, 17, 20, 21) which changes the resonant frequency of the resonant circuit
2 RFID label according to claim 1, characterized in that it comprises a sticker (13) with a metallic conductive layer, preferably of aluminum, provided
3 RFID label according to claim 2, characterized in that the label (13) in order to increase the effective capacitance of the resonant circuit in at least partial registration with at least two Uber on the same side of the substrate adjacent conductive surfaces is applied
4 RFID label according to one of claims 2 or 3, characterized in that the label (13) in order to increase the effective capacitance of the resonant circuit is disposed in at least partial Uber register with the further conductive surface and a conductive surface, which substantially is the same electrical potential as the first capacitor plate is
5 RFID label as claimed in any one of claims 3 or 4, that the label (13) is applied on the same substrate side as the conducting surfaces with which it interacts, preferably with an insulating adhesive layer (16) directly on these conductive 6 flat RFID label according to any one of claims 3-5, characterized in that the label (13) is applied to the opposite substrate side as the conductive surfaces with which it cooperates
7 RFID label according to one of claims 3 - 6, characterized in that the label (17) conductively connected to a conductive area on a substrate side and and is disposed in the rest such that it with a different type and different on a potential is located on the opposite flat substrate side in at least partial coverage Uber
8 RFID label according to one of claims 2 - 7, characterized in that the label (21) the purpose of lowering the effective inductance of the resonant circuit at least partially in a region inside the coil (4) is applied
9 RFID label according to claim 8, characterized in that the area inside the coil (4) having a center and that the label (21) offset from this center is applied
10 RFID label according to one of claims 1 - 9, characterized in that it is provided a composition having a local order (20), which preferably has a high dielectric constant in the range between ε r 2 and 10 wherein the local order ( 20) arranged in a space between two on the same substrate side, located on different electrical potential conductive surfaces bridged
11 cures RFID label according to claim 10, characterized in that the mass is in a liquid or pasty state coatable and then solidified and / or dried and / or
12 RFID label according to any one of claims 10 or 1 1, characterized in that the local order (20) bridges a gap between the further conductive surface and a conductive surface, which is located substantially at the same electrical potential as the first capacitor plate 13 RFID label according to any one of claims 1-12, characterized in that it is provided with a semiconductor integrated circuit in the form of a miniature chip (12), wherein the electrical connections preferably the other hand with the one part of the further conductive area and having a conductive surface are located at substantially the same electrical potential as the first capacitor plate
EP20010962432 2000-03-28 2001-02-07 Rfid label with an element for regulating the resonance frequency Withdrawn EP1269412A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CH5942000 2000-03-28
CH594002000 2000-03-28
PCT/CH2001/000085 WO2001073685A1 (en) 2000-03-28 2001-02-07 Rfid label with an element for regulating the resonance frequency

Publications (1)

Publication Number Publication Date
EP1269412A1 true EP1269412A1 (en) 2003-01-02

Family

ID=4522316

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20010962432 Withdrawn EP1269412A1 (en) 2000-03-28 2001-02-07 Rfid label with an element for regulating the resonance frequency

Country Status (4)

Country Link
US (1) US6796508B2 (en)
EP (1) EP1269412A1 (en)
JP (1) JP2003529163A (en)
WO (1) WO2001073685A1 (en)

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