EP2780867A1 - Radio-frequency communication device whereof the operation is controlled by a deliberate gesture by the wearer - Google Patents

Radio-frequency communication device whereof the operation is controlled by a deliberate gesture by the wearer

Info

Publication number
EP2780867A1
EP2780867A1 EP12813898.9A EP12813898A EP2780867A1 EP 2780867 A1 EP2780867 A1 EP 2780867A1 EP 12813898 A EP12813898 A EP 12813898A EP 2780867 A1 EP2780867 A1 EP 2780867A1
Authority
EP
European Patent Office
Prior art keywords
antenna
chip
circuit
protective layer
pads
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Withdrawn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
EP12813898.9A
Other languages
German (de)
French (fr)
Inventor
Elias Sabbah
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.)
ASK SA
Original Assignee
ASK SA
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 ASK SA filed Critical ASK SA
Publication of EP2780867A1 publication Critical patent/EP2780867A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06K19/073—Special arrangements for circuits, e.g. for protecting identification code in memory
    • G06K19/07309—Means for preventing undesired reading or writing from or onto record carriers
    • G06K19/07345—Means for preventing undesired reading or writing from or onto record carriers by activating or deactivating at least a part of the circuit on the record carrier, e.g. ON/OFF switches
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06K19/0775—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 arrangements for connecting the integrated circuit to the antenna
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06K19/07777—Antenna details the antenna being of the inductive type
    • G06K19/07779—Antenna details the antenna being of the inductive type the inductive antenna being a coil
    • G06K19/07783—Antenna details the antenna being of the inductive type the inductive antenna being a coil the coil being planar
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches

Definitions

  • Radiofreguence communication device
  • the present invention relates to a radiofrequency identification device provided with a means of interruption of operation and concerns in particular a radiofrequency communication device whose operation is controlled by a voluntary gesture of the wearer.
  • Radiofrequency identification devices are provided.
  • a contactless RFID device is a device consisting of an antenna and a chip connected to the terminals of the antenna. The chip is not powered and receives its energy by electromagnetic coupling between the antenna of the reader and the antenna of the RFID device, information is exchanged between the RFID device and the reader and in particular the information stored in the chip which has relates to the identification of the owner of the object on which the RFID device is located and its authorization to enter a controlled access zone for example.
  • the RFID device 111 illustrated in FIG. 1 is provided with a control device 116 comprising capacitive surfaces 117 and 118 which when they are are covered by the finger of the user allow the transmission of data from the device to the reader.
  • the device comprises an electronic module 114 connected by two connection pads 113 to an antenna 112.
  • the antenna is also connected to the two capacitive surfaces 117 and 118, each forming one of the two plates of two capacitors not shown in FIG. 116.
  • the circuit composed of the chip 114, the antenna 112 and the control device 116 is thus open at the location of the capacitive surfaces 117 and 118.
  • FIG. 2 represents the equivalent electrical diagram of the device of the prior art shown in FIG. 1.
  • the antenna 112 is equivalent to an inductance L, a resistor r and an inter-turn capacitance Cf.
  • the inter-turn capacitance Cf represents the capacity due to the winding of the turns and is created in the space between the turns 110.
  • the control device 116 is equivalent to a variable capacity Cg.
  • C represents the input capacitance of the chip 114 and R the load resistor of the chip 114.
  • the antenna 112, the chip 114 and the control device 116 are in parallel.
  • the device described above has a number of disadvantages. It is known that a circuit formed by a chip and an antenna is an oscillating circuit whose optimal operation is obtained when the resonance law of the following circuit is respected:
  • the device of FIG. 1 must not allow the transmission of the data of the chip whose resonant frequency of the open circuit is remote from the data transmission frequency equal to 13.56 MHz.
  • the input capacitance C of the chip being fixed, the inductance L of the antenna must be low to increase the value of f 0 . Therefore the antenna must have few turns, which induces a low antenna gain, inter-turn capacitance C £ low.
  • the product L * C is determined so that the resonance frequency of the open circuit is well beyond the frequency threshold which allows the exchange of data. For this, the frequency of the open circuit is of the order of 40 MHz.
  • the capacitance Cg increases the total capacity of the circuit of the device of the prior art and consequently decreases the resonant frequency of the circuit until it reaches the frequency necessary to allow the exchange of data.
  • the value is preponderant in the operation of the device of the prior art.
  • this value is linked on the one hand to the capacitance values C1 and C2 of the two capacitors which must be important and on the other hand is related to the positioning of the finger, the applied force and the coupling obtained. Therefore the device of the prior art has a non-homogeneous operation since depending on how the user grasps and actuates the control device. This can slow down and disrupt the reading of the card when it is used in a real-life situation, for example during an access control or an identity check.
  • the circuit when the finger is not affixed to the card, the circuit is open at the capacitors but the antenna 112 and the chip 114 continue to form a closed circuit.
  • the RFID device can thus always receive energy from the reader because the chip is always connected to the antenna. This means that the communication of data between the RFID device and the reader remains possible and will depend on the power emitted by the reader.
  • the object of the invention is to provide a radiofrequency device which overcomes the aforementioned drawbacks, the optimal operation of which is triggered by a voluntary action of the carrier homogeneously.
  • the object of the invention is therefore a non-contact portable device composed of at least two layers,
  • a support layer having on its first face an antenna formed of a plane winding of turns which intersect through an electrically insulating bridge, - A protective layer bonded to the first face of the support layer;
  • the antenna comprising two cuts it consists of two strands and four ends including two connection ends for the connection of a chip.
  • the antenna comprises two ends each extended by a stud, the two studs are not in contact with each other and are separated by a thin space so as to make the antenna open, both studs being located on the same plane as the antenna.
  • the antenna is closed by the circulation of a current between the two pads through the protective layer when a user places his finger on the protective layer at the location of the pads thus allowing the communication between the chip and a reader associated with the non-contact portable device.
  • FIG. 1 represents the device of the prior art
  • FIG. 2 represents the equivalent electric diagram of the device of the prior art of FIG. 1;
  • FIG. 3 represents a general diagram of the radiofrequency device according to the invention;
  • FIG. 4 represents the equivalent electrical diagram of the radiofrequency device according to the invention of FIG. 3,
  • FIG. 5 represents a detailed diagram of the sensitive zone equipping the device according to the invention.
  • the radiofrequency device according to the invention is a non-contact device intended to communicate remotely with a reader.
  • the device according to the invention advantageously applies to a card or a contactless ticket in the standard format of a smart card or to a passport cover called "inlay".
  • the device described here may be of another format without departing from the scope of the invention.
  • the device according to the invention comprises a support layer 311 shown in FIG. 3.
  • the support layer 311 is made of paper, synthetic paper (of the Teslin type) or of another material such as polycarbonate from PET or PVC. .
  • a circuit comprising an antenna 312, a chip 314 and a sensitive zone 316 is produced.
  • the antenna preferably planar, is produced by screen printing, flexography, gravure, offset printing. or inkjet from epoxy ink conductive ink loaded with conductive particles such as for example silver or gold or from a conductive polymer.
  • the antenna can also be made using other techniques such as etching.
  • the antenna is formed of a plane winding of turns 310 which intersect without being short-circuited by passing on and under an electrically layer 309.
  • the antenna 312 comprises at least two turns 310. However, the antenna being adjusted to the chip, the number of turns depends on the type of chip used.
  • the turns preferably have a constant spacing between them between 0.1 mm and 1 mm depending on the technology used.
  • the antenna is cut in two places so that it comprises two cuts, two strands and four ends.
  • the antenna 312 has two connection ends 321 and 322 on which the chip 314 is connected.
  • the chip 314 is connected according to a known method such as the flip-chip connection or according to other methods.
  • the antenna also has two other ends 323 and 324 each extended by a stud 333 and 33.
  • the two pads 333 and 334 form the sensitive area 316 of the antenna.
  • the two pads are made according to the same printing or etching process as the antenna 312 and are located on the support layer 311, therefore in the same plane as the antenna 312.
  • the pads are manufactured at the same time. as the antenna, they are made of the same material as the antenna so they are an integral part of the antenna.
  • the two studs located in the same plane are not in contact with each other and are separated by a space between 0.1 and 1.5 mm.
  • the stud 333 extends the end 323 of the antenna, which means that the stud 333 is connected to the end 323 of the antenna, and the stud 334 is connected to the end 324 of the antenna.
  • the length of the first antenna wire located between the connecting end 322 and the end 323 of the antenna is as small as possible; this length must not exceed 10% of the total length of the antenna and is preferably less than 5%, which makes it possible to prevent any supply of the chip when the circuit is open and thus to prevent any transmission of data between the contactless device and the reader.
  • the second antenna wire is located between the connection end 321 of the chip 314 and the end 324 of the the antenna.
  • the location of the bridge 309 is located on the antenna in the middle of the second strand which makes it possible to adapt the antenna to the chip so as to maximize the transfer of energy when the circuit is closed and thus optimize the data transmission. between the contactless device and the reader.
  • the support layer 311 is covered with at least one protective layer to protect the circuit and to finalize the device.
  • this first layer can be paper, synthetic paper, PVC, PET, PC, etc.
  • the antenna support layer is inserted between two plastic protective layers (PVC, PET, PC) constituting the upper and lower card bodies and heat-sealed by hot-pressurized laminating.
  • PVC, PET, PC plastic protective layers
  • the sensitive zone is disposed between two layers so as to be electrically insulated from the outside.
  • this first layer is made of paper or synthetic paper teslin type.
  • FIG. 4 represents the equivalent circuit diagram of the electronic circuit represented in FIG. 3.
  • the circuit comprises the antenna 312, the sensitive zone 316 and the chip 314.
  • the antenna 312 is equivalent to an inductance L, a resistor r and a capacitance inter-turns Cf.
  • the inter-turn capacitance Cf is created in the space between the turns 310 and represents the capacitance due to the winding of the turns.
  • the sensitive area 316 is equivalent to a variable capacity Ce.
  • C represents the input capacitance of the chip and R the load resistance of the chip.
  • the chip 314 is therefore in series with the sensitive zone 316.
  • the sensitive area 316 is open which corresponds to a capacity Ce almost zero.
  • the branch of the circuit comprising the chip is thus by default open.
  • the chip does not receive power when the antenna is open. There is therefore no exchange of information between the card and a reader associated.
  • the value of the resonance frequency of the open circuit is not critical to prevent the exchange of data.
  • the value of the resonance frequency of the device according to the invention may be less than 20 MHz while preventing the operation of the card without the apposition of the finger to the sensitive area.
  • the resonant frequency of the device according to the invention is by default equal to:
  • FIG. 5 An exemplary embodiment of the sensitive zone 316 according to the invention is shown in FIG. 5.
  • the dimensions of the sensitive zone are of the order of one inch.
  • the sensitive zone is of elliptical shape but could be rectangular, square, parallelepiped without departing from the scope of the invention.
  • the sensitive zone is formed of two distinct pads 333 and 334 nested one inside the other but having no area in contact because separated by a thin space 525.
  • the space 525 is delimited by the facing edges 523 and 524 of the two distinct pads 333 and 334. These edges are preferably parallel so that the space 525 has a constant width. This width is of the order of one millimeter and is preferably between 0.1 mm and 1.5 mm.
  • the application of a finger by the card holder on the sensitive area 316 causes a current flow between the two parts 521 and 522 because the finger has a low resistance, and an increase in the capacitance Ce of the sensitive area 316
  • the sensitive zone 316 is then in the closed position, the circuit composed of the chip 314, the antenna 312 and the sensitive zone is closed thereby allowing communication between the chip and a reader associated with the non-contact portable device.
  • k is a coefficient related to the shape of the sensitive zone and to the capacitance Ce of the sensitive zone.
  • the device according to the invention has the advantage of not having a mechanical interface or assembly of moving mechanical parts such as can be seen in a switch.
  • the sensitive zone does not include an element such as a sensor or other.
  • the device according to the invention does not have a conductive surface on its external surface. The sensing zone being made simultaneously with the antenna on the antenna support layer, the sensitive zone is completely concealed in the device, under the protective layer.

Abstract

The invention relates to a portable contactless device consisting of at least two layers, a support layer (311) comprising, on the first face thereof, an antenna (312) formed from a planar winding of turns (310) that intersect each other via an electrically insulating bridge (309), a protective layer adhered to the first face of the support layer; the antenna comprises two cuts and consists of two strands and four ends (321, 322, 323 and 324) including two connection ends (321, 322) for connecting a chip (314). According to the principal feature, the antenna comprises two ends (323, 324) each extended by a pad (333, 334), said pads not being in contact with each other and being separated by a thin space (525) such that the antenna is open, the antenna being closed by the flow of a current between the two pads via the protective layer when a user applies a finger to the protective layer in the region of the pads, thus allowing communication between the chip and a reader connected to the portable contactless device.

Description

Dispositif de communication radiofreguence  Radiofreguence communication device
dont le fonctionnement est contrôlé par un geste volontaire du porteur  whose operation is controlled by a voluntary act of the wearer
Domaine technique Technical area
La présente invention concerne un dispositif d'identification radiofréquence muni d'un moyen d' interruption du fonctionnement et concerne en particulier un dispositif de communication radiofréquence dont le fonctionnement est contrôlé par un geste volontaire du porteur .  The present invention relates to a radiofrequency identification device provided with a means of interruption of operation and concerns in particular a radiofrequency communication device whose operation is controlled by a voluntary gesture of the wearer.
Etat de la technique State of the art
Les dispositifs d'identification radiofréquence Radiofrequency identification devices
(RFID) sans contact sont de plus en plus utilisés pour l'identification des personnes circulant dans des zones à accès contrôlé ou transitant d'une zone à une autre. Le marché des documents sécurisés de type document d'identité tel que passeport, carte d'identité ou autre est de ce fait en plein essor. Un dispositif RFID sans contact est un dispositif constitué d'une antenne et d'une puce connectée aux bornes de l'antenne. La puce n'est pas alimentée et reçoit son énergie par couplage électromagnétique entre l'antenne du lecteur et l'antenne du dispositif RFID, des informations sont échangées entre le dispositif RFID et le lecteur et en particulier les informations stockées dans la puce qui ont trait à l'identification du possesseur de l'objet sur lequel se trouve le dispositif RFID et son autorisation à pénétrer dans une zone à accès contrôlé par exemple . (RFID) are increasingly used for the identification of people moving in areas with controlled access or transiting from one area to another. The market for secure documents of the identity document type such as passport, identity card or other is therefore booming. A contactless RFID device is a device consisting of an antenna and a chip connected to the terminals of the antenna. The chip is not powered and receives its energy by electromagnetic coupling between the antenna of the reader and the antenna of the RFID device, information is exchanged between the RFID device and the reader and in particular the information stored in the chip which has relates to the identification of the owner of the object on which the RFID device is located and its authorization to enter a controlled access zone for example.
L'un des problèmes majeurs soulevés par de tels dispositifs sans contact est le fait qu' ils peuvent être interrogés par un lecteur distant à 1 ' insu du porteur du dispositif. Ce problème est d'autant plus important lorsqu'il s'agit d'applications sensibles telles que carte bancaire, porte monnaie électronique et documents d'identité et de sécurité. One of the major problems raised by such contactless devices is the fact that they can be interrogated by a remote reader without the knowledge of the wearer of the device. This problem is even more important when it comes to sensitive applications such as card banking, electronic wallet and identity and security documents.
L'un des moyens pour pallier cet inconvénient est de munir le dispositif RFID d'un interrupteur mécanique apte à fermer le circuit d'antenne tel que décrit dans le document EP 1 939 792. Ce moyen nécessite une modification contraignante et coûteuse du processus de fabrication standard d'un dispositif radiofréquence ce qui représente un frein considérable dans leur développement sur le marché actuel.  One of the means for overcoming this disadvantage is to provide the RFID device with a mechanical switch able to close the antenna circuit as described in document EP 1 939 792. This means requires a constraining and costly modification of the process. standard manufacture of a radiofrequency device which represents a considerable brake in their development on the current market.
Un autre moyen est décrit dans le document EP 1 877 964 et illustré sur les figures 1 et 2. Le dispositif RFID 111 illustré sur la figure 1 est muni d'un dispositif de contrôle 116 comprenant des surfaces capacitives 117 et 118 qui lorsqu'elles sont recouvertes par le doigt de l'utilisateur permettent la transmission des données du dispositif au lecteur. Le dispositif comprend un module électronique 114 connecté par deux plots de connexion 113 à une antenne 112. L'antenne est également connectée aux deux surfaces capacitives 117 et 118, chacune formant une des deux plaques de deux condensateurs non représentés sur la figure, l'ensemble formant le dispositif de contrôle 116. Par défaut, le circuit composé de la puce 114, de l'antenne 112 et du dispositif de contrôle 116 est donc ouvert à l'endroit des surfaces capacitives 117 et 118.  Another means is described in document EP 1 877 964 and illustrated in FIGS. 1 and 2. The RFID device 111 illustrated in FIG. 1 is provided with a control device 116 comprising capacitive surfaces 117 and 118 which when they are are covered by the finger of the user allow the transmission of data from the device to the reader. The device comprises an electronic module 114 connected by two connection pads 113 to an antenna 112. The antenna is also connected to the two capacitive surfaces 117 and 118, each forming one of the two plates of two capacitors not shown in FIG. 116. By default, the circuit composed of the chip 114, the antenna 112 and the control device 116 is thus open at the location of the capacitive surfaces 117 and 118.
La figure 2 représente le schéma électrique équivalent du dispositif de l'art antérieur représenté sur la figure 1. L'antenne 112 est équivalente à une inductance L, une résistance r et une capacité inter-spires Cf. La capacité inter-spires Cf représente la capacité due à 1' enroulement des spires et est créée dans l' espace entre les spires 110. Le dispositif de contrôle 116 est équivalent à une capacité variable Cg. C représente la capacité d' entrée de la puce 114 et R la résistance de charge de la puce 114. L'antenne 112, la puce 114 et le dispositif de contrôle 116 sont en parallèle. Le dispositif décrit précédemment présente un certain nombre d'inconvénients. Il est connu qu'un circuit formé par une puce et une antenne est un circuit oscillant dont le fonctionnement optimal est obtenu lorsque la loi de résonance du circuit suivante est respectée : FIG. 2 represents the equivalent electrical diagram of the device of the prior art shown in FIG. 1. The antenna 112 is equivalent to an inductance L, a resistor r and an inter-turn capacitance Cf. The inter-turn capacitance Cf represents the capacity due to the winding of the turns and is created in the space between the turns 110. The control device 116 is equivalent to a variable capacity Cg. C represents the input capacitance of the chip 114 and R the load resistor of the chip 114. The antenna 112, the chip 114 and the control device 116 are in parallel. The device described above has a number of disadvantages. It is known that a circuit formed by a chip and an antenna is an oscillating circuit whose optimal operation is obtained when the resonance law of the following circuit is respected:
LCro2 = 1 (1) LCro 2 = 1 (1)
dans laquelle L représente l'inductance de l'antenne, C représente la capacité totale connectée à l'antenne et oo la pulsation égale à 2πί, dans laquelle f représente la fréquence de résonnance recherchée (par exemple à 13.56 MHz) . Donc il résulte que la fréquence de résonnance du circuit f0 est égale à :where L represents the inductance of the antenna, C represents the total capacity connected to the antenna and oo the pulse equal to 2πί, in which f represents the desired resonance frequency (for example at 13.56 MHz). Therefore it follows that the resonance frequency of the circuit f 0 is equal to:
Par défaut, le dispositif de la figure 1 ne doit pas permettre la transmission des données de la puce dont la fréquence de résonnance du circuit ouvert est éloignée de la fréquence de transmission des données égale à 13,56 MHz. Pour obtenir une telle fréquence, la capacité C d'entrée de la puce étant fixée, l'inductance L de l'antenne doit être faible pour augmenter la valeur de f0. Par conséquent l'antenne doit comporter peu de spires, ce qui induit un gain d'antenne faible, une capacité inter-spires C£ faible. Le produit L*C est déterminé de façon à ce que la fréquence de résonnance du circuit ouvert se situe bien au-delà du seuil de fréquence qui permet l'échange des données. Pour cela, la fréquence du circuit ouvert est de l'ordre de 40 MHz. Lorsque l'utilisateur saisit le dispositif 111 et pose son doigt sur les surfaces capacitives 117 et 118 il induit une connexion en série des deux condensateurs en parallèle avec l'antenne. La capacité obtenue par la connexion prend en compte la capacité Cl du premier condensateur formée de deux plaques dont l'une est la surface capacitive 117 et la capacité C2 du second condensateur formée de deux plaques dont l'une est la surface capacitive 118. Le circuit ainsi fermé doit avoir une fréquence f1 proche de 13.56 Mhz pour permettre l'échange de données. Sa fréquence est égale à fl : f, = l/2njL.(C + Cg +Cf). By default, the device of FIG. 1 must not allow the transmission of the data of the chip whose resonant frequency of the open circuit is remote from the data transmission frequency equal to 13.56 MHz. To obtain such a frequency, the input capacitance C of the chip being fixed, the inductance L of the antenna must be low to increase the value of f 0 . Therefore the antenna must have few turns, which induces a low antenna gain, inter-turn capacitance C £ low. The product L * C is determined so that the resonance frequency of the open circuit is well beyond the frequency threshold which allows the exchange of data. For this, the frequency of the open circuit is of the order of 40 MHz. When the user grasps the device 111 and places his finger on the capacitive surfaces 117 and 118 he induces a series connection of the two capacitors in parallel with the antenna. The capacitance obtained by the connection takes into account the capacitance C1 of the first capacitor formed of two plates, one of which is the capacitive surface 117 and the capacitor C2 of the second capacitor formed of two plates, one of which is the capacitive surface 118. circuit thus closed must have a frequency f 1 close to 13.56 Mhz to allow the exchange of data. Its frequency is equal to fl: f, = 1 / 2njL (C + Cg + Cf).
L et C étant fixés, Cf négligeable, le paramètre permettant de faire chuter la fréquence de 40 MHz à 13,56 MHz est la capacité du dispositif de contrôle Cg qui doit être importante. La quation :Since L and C are set, negligible, the parameter for dropping the frequency from 40 MHz to 13.56 MHz is the capacity of the control device Cg which must be large. The quation:
La capacité Cg augmente la capacité totale du circuit du dispositif de l'art antérieur et par conséquent diminue la fréquence de résonnance du circuit jusqu'à ce qu'elle atteigne la fréquence nécessaire pour permettre l'échange des données.  The capacitance Cg increases the total capacity of the circuit of the device of the prior art and consequently decreases the resonant frequency of the circuit until it reaches the frequency necessary to allow the exchange of data.
Par conséquent, la valeur est prépondérante dans le fonctionnement du dispositif de l'art antérieur. Or cette valeur est liée d'une part aux valeurs des capacités Cl et C2 des deux condensateurs qui doivent être importantes et d'autre part est liée au positionnement du doigt, à la force appliquée et au couplage obtenue. Par conséquent le dispositif de l'art antérieur a un fonctionnement non homogène puisque dépendant de la façon dont l'utilisateur saisit et actionne le dispositif de contrôle. Ce qui peut ralentir et perturber la lecture de la carte lors de son utilisation en situation réelle, par exemple lors d'un contrôle d'accès ou un contrôle d'identité.  Therefore, the value is preponderant in the operation of the device of the prior art. Now this value is linked on the one hand to the capacitance values C1 and C2 of the two capacitors which must be important and on the other hand is related to the positioning of the finger, the applied force and the coupling obtained. Therefore the device of the prior art has a non-homogeneous operation since depending on how the user grasps and actuates the control device. This can slow down and disrupt the reading of the card when it is used in a real-life situation, for example during an access control or an identity check.
De plus, comme on peut le voir sur le schéma électrique de la figure 2, lorsque le doigt n'est pas apposé sur la carte, le circuit est ouvert à l'endroit des condensateurs mais l'antenne 112 et la puce 114 continuent à former un circuit fermé. Le dispositif RFID peut ainsi toujours recevoir de l'énergie du lecteur car la puce est toujours connectée à l'antenne. Ce qui signifie que la communication des données entre le dispositif RFID et le lecteur reste possible et va dépendre de la puissance émise par le lecteur.  Moreover, as can be seen in the electrical diagram of FIG. 2, when the finger is not affixed to the card, the circuit is open at the capacitors but the antenna 112 and the chip 114 continue to form a closed circuit. The RFID device can thus always receive energy from the reader because the chip is always connected to the antenna. This means that the communication of data between the RFID device and the reader remains possible and will depend on the power emitted by the reader.
Un autre inconvénient des dispositifs de l'art antérieur réside dans la difficulté de les mettre en œuvre industriellement. En effet, la réalisation d'un interrupteur ou l'insertion de composants électroniques dans l'épaisseur du dispositif sans contact augmente le nombre d'étapes du processus de fabrication et donc par conséquent augmente le coût de revient du produit final. Exposé de l'invention Another disadvantage of the devices of the prior art lies in the difficulty of implementing them industrially. Indeed, the realization of a switch or the insertion of electronic components in the thickness of the non-contact device increases the number of steps in the manufacturing process and therefore increases the cost of the final product. Presentation of the invention
C'est pourquoi le but de l'invention est de fournir un dispositif radiofréquence qui pallie aux inconvénients précités, dont le fonctionnement optimal est déclenché par une action volontaire du porteur de façon homogène.  This is why the object of the invention is to provide a radiofrequency device which overcomes the aforementioned drawbacks, the optimal operation of which is triggered by a voluntary action of the carrier homogeneously.
L'objet de l'invention est donc un dispositif portable sans contact composé d'au moins deux couches,  The object of the invention is therefore a non-contact portable device composed of at least two layers,
- Une couche de support comportant sur sa première face une antenne formée d'un enroulement plan de spires qui se croisent grâce à un pont électriquement isolant, - Une couche de protection collée sur la première face de la couche de support ;  - A support layer having on its first face an antenna formed of a plane winding of turns which intersect through an electrically insulating bridge, - A protective layer bonded to the first face of the support layer;
L'antenne comprenant deux coupures elle se compose de deux brins et de quatre extrémités dont deux extrémités de connexion pour la connexion d'une puce. The antenna comprising two cuts it consists of two strands and four ends including two connection ends for the connection of a chip.
Selon la caractéristique principale, l' antenne comprend deux extrémités prolongées chacune par un plot, les deux plots ne sont pas en contact l'un avec l'autre et sont séparés par un espace fin de façon à rendre l'antenne ouverte, les deux plots étant situés sur le même plan que l'antenne.  According to the main characteristic, the antenna comprises two ends each extended by a stud, the two studs are not in contact with each other and are separated by a thin space so as to make the antenna open, both studs being located on the same plane as the antenna.
L' antenne est fermée par la circulation d' un courant entre les deux plots à travers la couche de protection lorsqu' un utilisateur appose son doigt sur la couche de protection à l' endroit des plots permettant ainsi la communication entre la puce et un lecteur associé au dispositif portable sans contact.  The antenna is closed by the circulation of a current between the two pads through the protective layer when a user places his finger on the protective layer at the location of the pads thus allowing the communication between the chip and a reader associated with the non-contact portable device.
Description brève des figures Brief description of the figures
Les buts, objets et caractéristiques de l'invention apparaîtront plus clairement à la lecture de la description qui suit faite en référence aux dessins dans lesquels : La figure 1 représente le dispositif de l'art antérieur, The objects, objects and features of the invention will appear more clearly on reading the following description given with reference to the drawings in which: FIG. 1 represents the device of the prior art,
La figure 2 représente le schéma électrique équivalent du dispositif de l'art antérieur de la figure 1, La figure 3 représente un schéma général du dispositif radiofréquence selon l'invention,  FIG. 2 represents the equivalent electric diagram of the device of the prior art of FIG. 1; FIG. 3 represents a general diagram of the radiofrequency device according to the invention;
La figure 4 représente le schéma électrique équivalent du dispositif radiofréquence selon l'invention de la figure 3,  FIG. 4 represents the equivalent electrical diagram of the radiofrequency device according to the invention of FIG. 3,
La figure 5 représente un schéma détaillé de la zone sensitive équipant le dispositif selon l'invention.  FIG. 5 represents a detailed diagram of the sensitive zone equipping the device according to the invention.
Description détaillée de l'invention Detailed description of the invention
Le dispositif radiofréquence selon l'invention est un dispositif sans contact destiné à communiquer à distance avec un lecteur. Le dispositif selon l'invention s'applique avantageusement à une carte ou à un ticket sans contact au format standard d'une carte à puce ou à une couverture de passeport appelée « inlay ». Cependant, le dispositif décrit ici peut être d'un autre format sans sortir du cadre de l'invention. Le dispositif selon l'invention comprend une couche de support 311 représenté sur la figure 3. La couche de support 311 est en papier, en papier synthétique (de type Teslin) ou d' un autre matériau tel que du polycarbonate du PET ou du PVC. Sur la première face de la couche de support 311, est réalisé un circuit comprenant une antenne 312, une puce 314 et une zone sensitive 316. L' antenne, de préférence planaire, est réalisée par impression de type sérigraphie, flexographie, héliogravure, offset ou jet d' encre à partir d' encre conductrice de type encre époxy chargée de particules conductrices telles que par exemple d' argent ou d' or ou à partir d' un polymère conducteur. L' antenne peut également être réalisée selon d' autre technique telle que la gravure d' aluminium (« etching ») . L' antenne est formée d' un enroulement plan de spires 310 qui se croisent sans se court-circuiter en passant dessus et dessous une couche électriquement isolante ou pont 309. L'antenne 312 comporte au moins deux spires 310. Cependant, l'antenne étant ajustée à la puce, le nombre de spires dépend du type de puce utilisé. Les spires présentent de préférence un espacement constant entre elles compris entre 0.1 mm et 1 mm suivant la technologie utilisée. L'antenne est coupée en deux endroits de sorte qu'elle comprend deux coupures, deux brins et quatre extrémités. The radiofrequency device according to the invention is a non-contact device intended to communicate remotely with a reader. The device according to the invention advantageously applies to a card or a contactless ticket in the standard format of a smart card or to a passport cover called "inlay". However, the device described here may be of another format without departing from the scope of the invention. The device according to the invention comprises a support layer 311 shown in FIG. 3. The support layer 311 is made of paper, synthetic paper (of the Teslin type) or of another material such as polycarbonate from PET or PVC. . On the first face of the support layer 311, a circuit comprising an antenna 312, a chip 314 and a sensitive zone 316 is produced. The antenna, preferably planar, is produced by screen printing, flexography, gravure, offset printing. or inkjet from epoxy ink conductive ink loaded with conductive particles such as for example silver or gold or from a conductive polymer. The antenna can also be made using other techniques such as etching. The antenna is formed of a plane winding of turns 310 which intersect without being short-circuited by passing on and under an electrically layer 309. The antenna 312 comprises at least two turns 310. However, the antenna being adjusted to the chip, the number of turns depends on the type of chip used. The turns preferably have a constant spacing between them between 0.1 mm and 1 mm depending on the technology used. The antenna is cut in two places so that it comprises two cuts, two strands and four ends.
L' antenne 312 comporte deux extrémités de connexion 321 et 322 sur lesquels la puce 314 est connectée. La puce 314 est connectée selon un procédé connu tel que la connexion en flip-chip ou selon d' autres procédés . L' antenne comporte également deux autres extrémités 323 et 324 prolongées chacune par un plot 333 et 33 . Les deux plots 333 et 334 forment la zone sensitive 316 de l'antenne. Les deux plots sont réalisés selon le même procédé d' impression ou de gravure que l' antenne 312 et sont situés sur la couche de support 311 donc dans le même plan que l'antenne 312. De préférence, les plots sont fabriqués en même temps que l' antenne, ils sont constitués du même matériau que l' antenne donc ils font partie intégrante de l' antenne. Les deux plots situés dans le même plan ne sont pas en contact l' un avec l' autre et sont séparés par un espace compris entre 0,1 et 1,5 mm. Le plot 333 prolonge l' extrémité 323 de l' antenne ce qui signifie que le plot 333 est connecté à l' extrémité 323 de 1' antenne, de même le plot 334 est connecté à l' extrémité 324 de l'antenne. La longueur du premier brin d'antenne situé entre l' extrémité de connexion 322 et l' extrémité 323 de l' antenne est la plus petite possible ; cette longueur ne doit pas excéder 10 % de la longueur totale de l' antenne et est de préférence inférieure à 5 %, ce qui permet d' empêcher toute alimentation de la puce lorsque le circuit est ouvert et ainsi d' empêcher toute transmission de données entre le dispositif sans contact et le lecteur. Le second brin d' antenne est situé entre l' extrémité de connexion 321 de la puce 314 et l' extrémité 324 de l'antenne. L'emplacement du pont 309 est situé sur 1' antenne au milieu du second brin ce qui permet d' adapter 1' antenne à la puce de façon à maximiser le transfert d' énergie lorsque le circuit est fermé et ainsi optimiser la transmission de données entre le dispositif sans contact et le lecteur. The antenna 312 has two connection ends 321 and 322 on which the chip 314 is connected. The chip 314 is connected according to a known method such as the flip-chip connection or according to other methods. The antenna also has two other ends 323 and 324 each extended by a stud 333 and 33. The two pads 333 and 334 form the sensitive area 316 of the antenna. The two pads are made according to the same printing or etching process as the antenna 312 and are located on the support layer 311, therefore in the same plane as the antenna 312. Preferably, the pads are manufactured at the same time. as the antenna, they are made of the same material as the antenna so they are an integral part of the antenna. The two studs located in the same plane are not in contact with each other and are separated by a space between 0.1 and 1.5 mm. The stud 333 extends the end 323 of the antenna, which means that the stud 333 is connected to the end 323 of the antenna, and the stud 334 is connected to the end 324 of the antenna. The length of the first antenna wire located between the connecting end 322 and the end 323 of the antenna is as small as possible; this length must not exceed 10% of the total length of the antenna and is preferably less than 5%, which makes it possible to prevent any supply of the chip when the circuit is open and thus to prevent any transmission of data between the contactless device and the reader. The second antenna wire is located between the connection end 321 of the chip 314 and the end 324 of the the antenna. The location of the bridge 309 is located on the antenna in the middle of the second strand which makes it possible to adapt the antenna to the chip so as to maximize the transfer of energy when the circuit is closed and thus optimize the data transmission. between the contactless device and the reader.
La couche de support 311 est recouverte d' au moins une couche de protection afin de protéger le circuit et afin de finaliser le dispositif. Dans le cas d'un ticket, cette première couche peut être en papier, papier synthétique, PVC, PET, PC, etc. Dans le cas d'une carte la couche de support d'antenne est insérée entre deux couches de protection en matière plastique (PVC, PET, PC) constituant les corps de carte supérieur et inférieur et thermosoudées par laminâtion sous pression à chaud. Ainsi, la zone sensitive est disposée entre deux couches de façon à être électriquement isolée de l'extérieur. Dans le cas d'un inlay pour passeport, cette première couche est en papier ou en papier synthétique de type teslin.  The support layer 311 is covered with at least one protective layer to protect the circuit and to finalize the device. In the case of a ticket, this first layer can be paper, synthetic paper, PVC, PET, PC, etc. In the case of a card, the antenna support layer is inserted between two plastic protective layers (PVC, PET, PC) constituting the upper and lower card bodies and heat-sealed by hot-pressurized laminating. Thus, the sensitive zone is disposed between two layers so as to be electrically insulated from the outside. In the case of a passport inlay, this first layer is made of paper or synthetic paper teslin type.
La figure 4 représente le schéma équivalent du circuit électronique représenté sur la figure 3. Le circuit comprend l'antenne 312, la zone sensitive 316 et la puce 314. L'antenne 312 est équivalente à une inductance L, une résistance r et une capacité inter-spires Cf. La capacité inter-spires Cf se créée dans l' espace entre les spires 310 et représente la capacité due à l'enroulement des spires. La zone sensitive 316 est équivalente à une capacité variable Ce. C représente la capacité d' entrée de la puce et R la résistance de charge de la puce. La puce 314 est donc en série avec la zone sensitive 316.  FIG. 4 represents the equivalent circuit diagram of the electronic circuit represented in FIG. 3. The circuit comprises the antenna 312, the sensitive zone 316 and the chip 314. The antenna 312 is equivalent to an inductance L, a resistor r and a capacitance inter-turns Cf. The inter-turn capacitance Cf is created in the space between the turns 310 and represents the capacitance due to the winding of the turns. The sensitive area 316 is equivalent to a variable capacity Ce. C represents the input capacitance of the chip and R the load resistance of the chip. The chip 314 is therefore in series with the sensitive zone 316.
Par défaut, la zone sensitive 316 est ouverte ce qui correspond à une capacité Ce quasi nulle. Comme on peut le voir sur le schéma électrique équivalent de la figure 4, la branche du circuit comportant la puce est donc par défaut ouverte. Par conséquent, la puce ne reçoit pas d'énergie lorsque l' antenne est ouverte. Il n' y a donc pas d' échanges d' informations possibles entre la carte et un lecteur associé. Contrairement au dispositif de l' art antérieur, la valeur de la fréquence de résonnance du circuit ouvert n' est pas déterminante pour empêcher l' échange des données. Au contraire, la valeur de la fréquence de résonnance du dispositif selon l' invention peut être inférieure à 20 MHz tout en empêchant le fonctionnement de la carte sans l' apposition du doigt sur la zone sensitive. La fréquence de résonnance du dispositif selon l' invention est par défaut égale à : By default, the sensitive area 316 is open which corresponds to a capacity Ce almost zero. As can be seen in the equivalent electrical diagram of FIG. 4, the branch of the circuit comprising the chip is thus by default open. As a result, the chip does not receive power when the antenna is open. There is therefore no exchange of information between the card and a reader associated. Unlike the device of the prior art, the value of the resonance frequency of the open circuit is not critical to prevent the exchange of data. On the contrary, the value of the resonance frequency of the device according to the invention may be less than 20 MHz while preventing the operation of the card without the apposition of the finger to the sensitive area. The resonant frequency of the device according to the invention is by default equal to:
f0 = l/ln^LCf (3) f 0 = l / ln ^ LCf (3)
Comme on peut le voir dans l' équation (3), seule la valeur de la capacité inter spire intervient dans la valeur de la fréquence de résonnance du dispositif selon l' invention. Donc quelle que soit la valeur de la fréquence de résonnance, il n' y a pas d' échange entre le dispositif selon l' invention et un lecteur associé.  As can be seen in equation (3), only the value of the interturn capacitance is involved in the value of the resonance frequency of the device according to the invention. Therefore whatever the value of the resonance frequency, there is no exchange between the device according to the invention and an associated reader.
Un exemple de réalisation de la zone sensitive 316 selon l'invention est représenté sur la figure 5. Les dimensions de la zone sensitive sont de l'ordre des dimensions d'un pouce. De préférence, la zone sensitive est de forme elliptique mais pourrait être rectangulaire, carré, parallélépipédique sans sortir du cadre de l'invention. La zone sensitive est formée de deux plots distincts 333 et 334 imbriqués l'un dans l'autre mais ne présentant aucune zone en contact car séparés par un espace fin 525. L'espace 525 est délimité par les bords en regard 523 et 524 des deux plots distincts 333 et 334. Ces bords sont de préférence parallèles afin que l'espace 525 ait une largeur constante. Cette largeur est de l'ordre du millimètre et est de préférence comprise entre 0.1 mm et 1.5 mm .  An exemplary embodiment of the sensitive zone 316 according to the invention is shown in FIG. 5. The dimensions of the sensitive zone are of the order of one inch. Preferably, the sensitive zone is of elliptical shape but could be rectangular, square, parallelepiped without departing from the scope of the invention. The sensitive zone is formed of two distinct pads 333 and 334 nested one inside the other but having no area in contact because separated by a thin space 525. The space 525 is delimited by the facing edges 523 and 524 of the two distinct pads 333 and 334. These edges are preferably parallel so that the space 525 has a constant width. This width is of the order of one millimeter and is preferably between 0.1 mm and 1.5 mm.
L' apposition d' un doigt par le porteur de la carte sur la zone sensitive 316 provoque une circulation de courant entre les deux parties 521 et 522 car le doigt présente une résistance faible, et une augmentation de la capacité Ce de la zone sensitive 316. La zone sensitive 316 est alors en position fermée, le circuit composé de la puce 314, de l'antenne 312 et de la zone sensitive est alors fermé permettant ainsi la communication entre la puce et un lecteur associé au dispositif portable sans contact. La fréquence de résonnance est alors égal à : f0 = l/2njL. ( Cf + k * C) . (4) The application of a finger by the card holder on the sensitive area 316 causes a current flow between the two parts 521 and 522 because the finger has a low resistance, and an increase in the capacitance Ce of the sensitive area 316 The sensitive zone 316 is then in the closed position, the circuit composed of the chip 314, the antenna 312 and the sensitive zone is closed thereby allowing communication between the chip and a reader associated with the non-contact portable device. The resonance frequency is then equal to: f 0 = 1 / 2njL. (Cf + k * C). (4)
où k est un coefficient lié à la forme de la zone sensitive et à la capacité Ce de la zone sensitive. Comme on peut le voir dans l'équation (4), lorsque le dispositif selon l' invention est actionné par l' apposition du doigt la capacité de la puce participe aussi à 1' obtention de la fréquence de résonnance en plus de la capacité inter spire. De ce fait, la capacité de la puce est prépondérante dans le déclenchement de la fonction RF du dispositif. where k is a coefficient related to the shape of the sensitive zone and to the capacitance Ce of the sensitive zone. As can be seen in equation (4), when the device according to the invention is actuated by the apposition of the finger the capacity of the chip also participates in 1 obtaining the resonance frequency in addition to the inter capacitance. turn. As a result, the capacitance of the chip is preponderant in triggering the RF function of the device.
Le dispositif selon l' invention présente l' avantage de ne pas avoir d' interface mécanique ni d' assemblage de pièces mécaniques mobiles telles qu' on peut en voir dans un interrupteur. La zone sensitive ne comporte pas d'élément rapporté tel qu'un capteur ou autre. Le dispositif selon 1' invention n' a pas de surface conductrice sur sa surface externe. La zone sensitive étant réalisée en même temps que 1' antenne sur la couche de support d' antenne, la zone sensitive est totalement dissimulée dans le dispositif, sous la couche de protection.  The device according to the invention has the advantage of not having a mechanical interface or assembly of moving mechanical parts such as can be seen in a switch. The sensitive zone does not include an element such as a sensor or other. The device according to the invention does not have a conductive surface on its external surface. The sensing zone being made simultaneously with the antenna on the antenna support layer, the sensitive zone is completely concealed in the device, under the protective layer.

Claims

REVENDICATIONS
1. Dispositif portable sans contact composé d'au moins deux couches, 1. Non-contact portable device composed of at least two layers,
- Une couche de support (311) comportant sur sa première face une antenne (312) formée d'un enroulement plan de spires (310) qui se croisent grâce à un pont électriquement isolant (309) ,  - a support layer (311) having on its first face an antenna (312) formed of a plane winding of turns (310) which intersect by an electrically insulating bridge (309),
- Une couche de protection collée sur la première face de la couche de support,  A protective layer bonded to the first face of the support layer,
Ladite antenne comprenant deux coupures elle se compose de deux brins et de quatre extrémités (321, 322, 323 et 324) dont deux extrémités de connexion (321, 322) pour la connexion d'une puce (314);  Said antenna comprising two cuts it consists of two strands and four ends (321, 322, 323 and 324) including two connection ends (321, 322) for the connection of a chip (314);
Caractérisé en ce que ladite antenne comprend deux extrémités (323, 324) prolongées chacune par un plot (333, 334), les deux plots ne sont pas en contact l'un avec l'autre et sont séparés par un espace fin (525) de façon à rendre ladite antenne ouverte, les deux plots sont situés sur le même plan que l'antenne,  Characterized in that said antenna comprises two ends (323, 324) each extended by a stud (333, 334), the two studs are not in contact with each other and are separated by a thin space (525) in order to make said antenna open, the two studs are located on the same plane as the antenna,
ladite antenne étant fermée par la circulation d' un courant entre les deux plots (333, 334) à travers ladite couche de protection lorsqu' un utilisateur appose son doigt sur la couche de protection à l' endroit des plots permettant ainsi la communication entre ladite puce et un lecteur associé audit dispositif portable sans contact.  said antenna being closed by the circulation of a current between the two pads (333, 334) through said protective layer when a user places his finger on the protective layer at the location of the pads thus allowing the communication between said chip and a reader associated with said contactless portable device.
2. Dispositif selon la revendication 1 dans lequel ledit espace (525) a une largeur constante de l'ordre du millimètre et est de préférence comprise entre 0.1 mm et 1.5 mm . 2. Device according to claim 1 wherein said space (525) has a constant width of the order of one millimeter and is preferably between 0.1 mm and 1.5 mm.
3. Dispositif selon la revendication 1 ou 2, dans lequel le premier brin du circuit d' antenne situé entre l'extrémité de connexion (322) de la puce et l'extrémité (323) a une longueur inférieure à 10 % de la longueur totale de l' antenne ce qui permet d' empêcher toute alimentation de la puce lorsque le circuit est ouvert et ainsi d' empêcher toute transmission de données entre le dispositif sans contact et le lecteur. 3. Device according to claim 1 or 2, wherein the first strand of the antenna circuit located between the connection end (322) of the chip and the end (323) has a length less than 10% of the length. of the antenna which prevents any supplying the chip when the circuit is open and thus preventing any transmission of data between the contactless device and the reader.
4. Dispositif selon l'une des revendications précédentes, dans lequel l' emplacement dudit pont isolant (309) est situé sur le circuit d' antenne au milieu du second brin situé entre l'extrémité de connexion (321) de la puce et l'extrémité (324) de l'antenne ce qui permet d' adapter l' antenne à la puce de façon à maximiser le transfert d' énergie lorsque le circuit est fermé et ainsi optimiser la transmission de données entre le dispositif sans contact et le lecteur. 4. Device according to one of the preceding claims, wherein the location of said insulating bridge (309) is located on the antenna circuit in the middle of the second strand located between the connection end (321) of the chip and the end (324) of the antenna which allows to adapt the antenna to the chip so as to maximize the transfer of energy when the circuit is closed and thus optimize the transmission of data between the device without contact and the reader .
5. Dispositif selon l'une des revendications précédentes, dans lequel lesdits deux plots (333, 334) forment une zone sensitive (316) de forme elliptique. 5. Device according to one of the preceding claims, wherein said two studs (333, 334) form a sensitive zone (316) of elliptical shape.
EP12813898.9A 2011-11-15 2012-11-15 Radio-frequency communication device whereof the operation is controlled by a deliberate gesture by the wearer Withdrawn EP2780867A1 (en)

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FR1103471A FR2982687A1 (en) 2011-11-15 2011-11-15 RADIOFREQUENCY COMMUNICATION DEVICE WHOSE OPERATION IS CONTROLLED BY A VOLUNTARY GESTURE OF THE BEARER
PCT/FR2012/000460 WO2013072578A1 (en) 2011-11-15 2012-11-15 Radio-frequency communication device whereof the operation is controlled by a deliberate gesture by the wearer

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WO2013072578A1 (en) 2013-05-23
FR2982687A1 (en) 2013-05-17
HK1201961A1 (en) 2015-09-11
TW201333831A (en) 2013-08-16
MX2014005920A (en) 2014-06-19
US8870075B2 (en) 2014-10-28
TWI574210B (en) 2017-03-11
KR20140101734A (en) 2014-08-20
BR112014011324A2 (en) 2017-05-09
RU2014124151A (en) 2015-12-27
SG11201402295TA (en) 2014-09-26
US20130134224A1 (en) 2013-05-30

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