EP0865614A1 - Transpondeur electronique sans contacts comportant un circuit imprime d'antenne cadre - Google Patents

Transpondeur electronique sans contacts comportant un circuit imprime d'antenne cadre

Info

Publication number
EP0865614A1
EP0865614A1 EP96939792A EP96939792A EP0865614A1 EP 0865614 A1 EP0865614 A1 EP 0865614A1 EP 96939792 A EP96939792 A EP 96939792A EP 96939792 A EP96939792 A EP 96939792A EP 0865614 A1 EP0865614 A1 EP 0865614A1
Authority
EP
European Patent Office
Prior art keywords
conductive
particles
substrate
electronic transponder
hand
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Withdrawn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
EP96939792A
Other languages
German (de)
English (en)
Inventor
Michel Bisson
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0865614A1 publication Critical patent/EP0865614A1/fr
Withdrawn legal-status Critical Current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
    • G06K19/077—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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V15/00—Tags attached to, or associated with, an object, in order to enable detection of the object
    • 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
    • G06K19/0723—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
    • G06K19/0726—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 the arrangement including a circuit for tuning the resonance frequency of an antenna on the record carrier
    • 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
    • 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

Definitions

  • the invention relates to a transponder capable of transmitting information to an interrogator station through electromagnetic radiation, inductive coupling or capacitive coupling. More specifically, the invention provides a hand-held transponder with a novel antenna circuit including conductive pathways formed of discrete conductive particles in physical contact with one another. The invention also relates to a method for manufacturing the transponder.
  • Hand-held electronic cards capable of exchanging data with an interrogator station through modulated electromagnetic radiation are used in a variety of applications.
  • such cards can be used to open a lock, perform financial transactions or as storage devices to hold vital data, such as the medical record of the user.
  • the card contains an integrated electronic circuit mounted on a flexible substrate made of plastic material.
  • the electronic circuit includes a memory for storing information, a processing unit and a modulator/demodulator section connected to an antenna circuit. In use, the card is brought close to the interrogator station that generates a burst of electromagnetic radiation that is converted by the antenna on the card into electrical energy sufficient to power up the electronic circuit.
  • the processing unit retrieves the information present in the memory and directs the data to the modulator that transmits the information back to the interrogator station via the antenna.
  • the data transmission process toward the interrogator station may be active or passive.
  • the active transmission requires the emission of a modulated carrier wave. This mode of communication is particularly useful when the transponder is at some distance from the interrogator station.
  • the passive transmission is much simpler and it is effected by modulating the energy transfer from the interrogator station to the transponder to communicate a message. For instance, by varying the impedance of the antenna circuit of the transponder the coupling with the interrogator station changes which translates in a variation of the energy transfer rate between the two devices. Such variation can be made by switching on and off a resistor in the antenna circuit in accordance to a binary coded sequence. The sequence is detected at the interrogator station by monitoring the changes in the energy transfer rate.
  • the contents of the memory can be modified by the interrogator.
  • An example is an automated toll collection system.
  • the card that is normally carried by the user contains a memory in which is stored a numerical value representing a credit amount allocated to the user. ⁇ t each toll passage, the interrogator station overwrites the data with a value corresponding to the credit amount less the toll charge. Access is denied if insufficient credit is available on the card.
  • medical data can be stored in the card memory to enable a doctor to gain access to the treatment and medication history of the user quickly.
  • the medical data is updated when significant events occur, such as a new treatment prescribed to the user.
  • the antenna circuit on the card includes a coil- shaped conductor to which is incorporated a capacitor forming a resonant RLC circuit.
  • Various methods have been developed in the past recent years to embed or otherwise affix the coil-shaped conductor to the card.
  • One example is the U.S. patent 5,339,847 issued to Francois Droz on March 21, 1995 that suggests to wind a conductor wire in a loop pattern and then embed the wire in a substrate that also encapsulates the electronic circuitry of the card. This approach has not been particularly successful because the method of encapsulation is complex and expensive to carry out.
  • the foil conductor may develop cracks due to bending of the insulating base that may result in an open antenna circuit that is partially or totally inoperative. Such bending strains are particularly common in hand-held electronic cards carried in one's wallet or purse. Thus, unless the card is handled delicately and with great care, which is atypical of this sort of devices, the risks of damaging the antenna circuit are high.
  • An object of the invention is a portable electronic transponder, such as a hand-held electronic card with a conducting pathway that is highly resistant to flexing and can be produced easily and at low cost.
  • An ancillary object of the invention is a portable electronic transponder with an antenna circuit incorporating a capacitor component and a resistor component.
  • Another object of the invention is a method for manufacturing the aforementioned electronic transponder.
  • transponder means a device capable of accepting the challenge of an interrogator station and issuing a response. This implies that the transponder has both a reception and a transmission capability.
  • reception is used in a very general sense and it is not limited to the conversion of modulated signals into desired useful information. For instance, the ability to recognize a trigger signal issued from the interrogator station, which conveys no particular intelligence but merely causes the transponder to emit a response, will be considered to meet the requirement for reception capability.
  • transmission should be interpreted to cover the remote communication of information, irrespective of the particular method chosen to do so. Possible methods are the active transmission and the passive transmission, both discussed in the introductory portion of this specification.
  • the invention provides a hand-held electronic transponder, comprising:
  • the substrate is an integrally formed plate of synthetic material that is relatively flexible.
  • the plate is milled on one of its main surfaces to provide a recess for holding the electronic circuit that combines the memory, processing unit, modulator and demodulator functions, among others.
  • the surface of the card containing the recess is imprinted with a pattern of coil-shaped conductors by using a mixture of discrete conductive particles suspended in binder (organic binder, epoxy binder, thermoplastic binder, etc) .
  • the pattern can be printed by using any suitable technique, such as gravure or screen printing.
  • the binder shrinks when it sets, thus causing the conductive particles to touch in a random pattern and produce an electrically conductive coating.
  • the fact that the coating is an agglomeration of particles permits the conductive pattern to better survive mechanical stresses applied on the substrate.
  • This process can be used to create three-dimensional conductor patterns that are useful to allow one conductor to cross over another conductor on the substrate, or create capacitors.
  • the three-dimensional conductor array requires a three-step print. First, the conducting pathways on the lowermost level are deposited and the binder is allowed to set. An intermediate layer of dielectric material is laid on part of the conducting pathway on the lowermost level that will eventually be overlaid by the uppermost conducting pathway formation. When the dielectric material is cured, the final printing step deposits a mixture of discrete conductive particles on the dielectric zone. The superposed conducting pathways, separated by the dielectric layer form a capacitor structure that is fully integrated to the antenna circuit. The surface area of conductive material overlap, and the thickness of the dielectric layer, determine the capacitance. The above described procedure is extremely advantageous in that it allows to integrate capacitance in the printed circuit at very low cost without the necessity of soldering or otherwise joining discrete components.
  • discrete particles having low electrical conductivity can be admixed with the high conductivity particles. This creates a distributed resistor structure.
  • a two-step printing procedure can be used, first to lay a pattern of high conductivity pathway that contains a blank, i.e., an unconnected area designed to receive the resistor.
  • a mixture containing solely low electrical conductivity particles is deposited to fill the blank and thus complete the electrical path of the circuit.
  • the invention also provides a portable electronic transponder, comprising:
  • said antenna circuit including a multitude of discrete conductive particles fixed to said substrate, said discrete conductive particles being distributed on a predetermined surface area of said substrate in the form of a coil and being in physical contact one with another over said surface area to form a conductive pathway.
  • the invention further provides a method for manufacturing an antenna circuit on a substrate, said method comprising the steps of:
  • the invention also provides a method for providing a conductive path on a substrate, said method comprising the steps of:
  • FIG. 1 is a top plan view of an electronic card according to the invention showing a coil-shaped conductor that forms an antenna circuit; and - Figure 2 is the equivalent electric circuit of the lay out shown in Figure 1.
  • the card 10 comprises a substrate 12 made of non-conductive synthetic material such as polyvinyl chloride, PETG polyester or polycarbonate, polysulfonal or any other suitable rigid plastics material, reinforced plastics material or ceramic material.
  • the substrate 12 is in the form of a flat rectangular plate having a thickness of about 0.030 inches. The length and the width dimensions of the substrate approximate those of a credit card, but may greatly vary without departing from the spirit of the invention.
  • the substrate is machined near the upper right corner to provide a recess 14 of a circular configuration that receives an integrated circuit combining memory, processing unit, and modulator and demodulator functions.
  • An integrated circuit available under the brand name Myfare from Mikron, Austria that is currently produced by the Atmel silicon foundry in the United-States has been found satisfactory. The same circuit is also available from Siemens Electric G Bh.
  • the type of integrated circuit that will be used depends upon the intended application. Thus, the present invention should not be limited to the type of integrated circuitry provided on the substrate 12.
  • the recessed area 14 is formed by machining with a rotary end mill a central circular cavity 16 having a depth of approximately 0.0150 inches.
  • the cavity 16 is surrounded by an annular tapered zone 18 that forms the transition between the main surface of the substrate 12 and the edge of the circular cavity 16.
  • the integrated circuit is deposited in the circular cavity 36 and the connections with the antenna circuit that will be described below made by the intermediary of connection pads formed on the tapered area 18.
  • an antenna circuit 20 is formed on the main surface of the substrate 12.
  • the antenna circuit 20 is a single conductive pathway arranged as a multi turn coil which runs near the peripheral edges of the substrate 12.
  • the leading extremity 22 of the conductive pathway the one that initiates the spiral formation from the inside terminates with an enlarged contact pad area 24 extending over an angular sector of about 120° on the tapered zone 18.
  • the terminal extremity 24 of the conductive pathway crosses over the coil formation to join with a connection pad 26 that is similar in construction to the connection pad 24.
  • a layer 28 of the dielectric material is applied between them.
  • the three-dimensional conductive pathway configuration in the crossover region constitutes a capacitor used for tuning the antenna to a desired resonant frequency.
  • the capacitance of the structure can be established by the following formula.
  • F k relative dielectric constant of the insulator (layer 28) .
  • the relative dielectric constant compares the dielectric layer 28 to vacuum which is a constant of 1.
  • 12 Farads/meter A the overlapping areas of the conductive pathways in square meters
  • d is the separation of the conductors (thickness of layer 28) in meters.
  • the formula shows that the capacitance is primarily function of two factors: a) the surface area of the conductors on either side of the dielectric film 28; b) the thickness of the dielectric film.
  • an increase in the surface area of the overlapping conductive pathways increases the capacitance.
  • Increasing the thickness of the dielectric layer 28 decreases the capacitance.
  • the segment of the conductive pathway between the leading portion 22 and the terminal portion 24 is in the form of a flat coil and has an inductance function in the overall antenna circuit 20.
  • the value of the inductance can be approximated by the following formula:
  • the equivalent circuit of the antenna 20 is shown in Figure 2.
  • the circuit comprises an inductor 30 formed by the coil shaped conductive pathway in parallel with a capacitor 32 resulting from the conductors overlap in the crossover area.
  • the capacitor 32 is connected to the integrated circuit 34 mounted in the cavity 16, by the intermediary of connection pad areas 26 and 44.
  • the antenna circuit 20 is produced by a printing technique that consists of depositing at a precise location on the surface of the substrate 12 a mixture of discrete conductive particles suspended in binder.
  • the composition is a mechanical mixture of silver powders and an organic solvent based binder.
  • the silver particles are a combination of 80% flake particles and 20% amorphous shaped particles.
  • amorphous is meant particles having random geometrical shapes.
  • particles plated with a conductive coating can be used, such as silver or gold plated carbon, silver or gold plated nickel or silver or gold plated copper particles.
  • the preferred binder base is poly methyl methacrylate dissolved in toluene, xylene, naphtha or ⁇ ec-butanol.
  • Epoxy binders and thermoplastic binders can also be used. Epoxy binders require a catalyst to effect curing.
  • the catalyst may be of chemical nature or physical nature such as ultra-violet radiation.
  • the thermoplastic binders are plastics which when elevated to high temperature convert to a liquid state. While in this state the conductive particles are added in the correct proportions to form the conductive composition. The conductive composition so formed is applied hot and sets upon cooling.
  • a conductive composition including 80% by weight of silver powder and 20% by weight of poly methyl methacrylate binder has been found satisfactory.
  • the screen printing technique is the method of choice for creating the conductive pathways.
  • a mask with areas cut out according to the desired conductor pattern (a multi turn coil in the present example) is placed against the surface of the substrate 12.
  • the suspension of discrete conductive particles is then spread over the screen so it contacts the surface of the substrate 12 through the screen apertures to form a deposit matching precisely the desired conductive pathway design.
  • the screen is then carefully removed and the suspension deposit allowed to set.
  • the curing procedure depends upon the nature of the binder.
  • Organic binders cure by release of solvents.
  • Epoxy binders require a chemical reaction initiated by a suitable catalyst which is applied at the appropriate step during the manufacturing procedure.
  • Thermoplastic binders require cooling to set.
  • the mixture while in the liquid state, is substantially non conductive because the binder is a dielectric medium and the conductive particles are separated from one another.
  • the binder sets it shrinks which causes the discrete metallic particles to contact one another in a random fashion and thus donate conductivity to the agglomeration of particles.
  • the binder fixes the conductive particles to the substrate 12 so they are permanently retained to it.
  • the deposit is an agglomeration of conductive particles, rather than a continuous conductive medium such as metallic foil permits the conductive pathway to survive mechanical bending stresses encountered in normal use of the transponder 10.
  • a three-step printing process is employed. During the first step, the entire coil-shaped conductive pathway is produced except for the terminal segment 24 at the crossover area. When the suspension of conductive particles is cured, a ⁇ econd printing step deposits the dielectric layer 28 of suitable material to electrically insulate the ⁇ egments of the conductive pathway in the crossover area. After the dielectric film is completely dry, the final printing step lays the terminal portion 24 to connect the conductor 20 with the connection pad 26.
  • Each printing step uses a separate screen with apertures patterned to create the desired deposition pattern.
  • the first screen corresponds to the multi turn coil-shaped conductive pathway less the terminal portion 24.
  • the second screen has a rectangular aperture registering with the previously laid conductive pathway in the crossover area.
  • the third and final screen has an elongated slot to electrically connect the coil- shaped conductive pathway with the connection pad area 26.
  • a resistor in the antenna circuit 20 it is possible to add to the liquid suspension of metallic particles some particles of carbon that have high resistivity and therefore contribute to elevate the global resistance of the antenna circuit 20.
  • the equivalent resistor is distributed over the entire conductive pathway.
  • a localized resistor component may be produced by first depositing mixture containing solely low conductivity particles. The deposition pattern is such that a "blank", i.e., an empty area is left in the conductive pathway. During a second printing step a low conductivity solution is deposited on the blank to complete the electrical circuit.
  • a resi ⁇ tive mixture formulation that could be used has 80% carbon particles and 20% organic binder such as poly methyl methacrylate in toluene.
  • the manufacturing process of the transponder 10 begins by machining the substrate 12 using a shaped vertical plunge mill to form the recess 14 that holds the integrated circuit.
  • the primary antenna circuit 20 is imprinted on the milled substrate followed by the deposition of the dielectric film at the crossover and the capacitance areas.
  • a solution of conductive particles is deposited last on the substrate to form the contact pads for the integrated circuit and over the previously laid dielectric film to complete the crossover area and the capacitance.
  • the integrated circuit is placed in the recess 14 to bring its terminals in contact with the solution still in the liquid phase. Adhesive is used to bond the body of the integrated circuit to the substrate 12. As the solution of conductive particles sets a permanent electrical contact is created with the terminals of the integrated circuit. It is also possible to install the integrated circuit in the substrate 12 immediately after the deposition of the dielectric film and then print the contact pads to effect the electrical connection.
  • the antenna pattern and the integrated circuit may be covered by a protective polymer coating.
  • Polyurethane monomer with an ultra violet polymerizing agent is a suitable covering material.
  • acrylics or other plastic monomers can be used.
  • the electronic transponder has been described above in the form a hand-held card it may take various other configurations.
  • the transponder may be designed as a keyfob or any other suitable ⁇ tructure that can be conveniently carried in one's pocket, purse or wallet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Parts Printed On Printed Circuit Boards (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

Cette invention concerne un transpondeur électronique (10) portatif comportant un circuit imprimé d'antenne cadre. On fabrique ce circuit d'antenne en déposant sur un substrat plan (12), et selon un motif prédéterminé, un mélange de particules conductrices discrètes se trouvant en suspension dans un liquide. Lorsque le milieu de suspension s'évapore, les particules conductrices vont entrer en contact de manière aléatoire les unes avec les autres, et définir ainsi un chemin conducteur. Ce procédé peut également être utilisé dans la fabrication de motifs conducteurs tridimensionnels, laquelle consiste à imprimer des couches de chemins conducteurs électroniques qui sont intercalés avec des films de diélectrique. Lorsque les chemins conducteurs de deux couches adjacentes se chevauchent, on obtient un condensateur (14) dont la capacité est fonction de la surface des chemins conducteurs (18) se chevauchant et de l'épaisseur du matériau diélectrique (28) séparant lesdits chemins. Le condensateur peut être utilisé afin de régler le circuit d'antenne à une fréquence prédéterminée. On peut également introduire une résistance dans le circuit d'antenne en ajoutant à la suspension de particules conductrices une certaine quantité de particules possédant une résistivité relativement élevée.
EP96939792A 1995-12-05 1996-12-05 Transpondeur electronique sans contacts comportant un circuit imprime d'antenne cadre Withdrawn EP0865614A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US567520 1990-08-15
US56752095A 1995-12-05 1995-12-05
PCT/CA1996/000816 WO1997021118A1 (fr) 1995-12-05 1996-12-05 Transpondeur electronique sans contacts comportant un circuit imprime d'antenne cadre

Publications (1)

Publication Number Publication Date
EP0865614A1 true EP0865614A1 (fr) 1998-09-23

Family

ID=24267500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96939792A Withdrawn EP0865614A1 (fr) 1995-12-05 1996-12-05 Transpondeur electronique sans contacts comportant un circuit imprime d'antenne cadre

Country Status (3)

Country Link
EP (1) EP0865614A1 (fr)
AU (1) AU7689596A (fr)
WO (1) WO1997021118A1 (fr)

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JPH11177027A (ja) * 1997-09-15 1999-07-02 Microchip Technol Inc 集積回路半導体チップ及び誘導性コイルを含む片面パッケージ並びにその製造方法
DE19940560C2 (de) * 1999-08-26 2001-09-13 Infineon Technologies Ag Verfahren zur Herstellung eines Halbleiterchips mit nach dem Siliziumprozess einstellbarer elektrischer Eigenschaft
KR100806237B1 (ko) * 1999-11-17 2008-02-22 소니 가부시끼 가이샤 통신 장치, 통신 시스템 및 통신 수단
DE10145750A1 (de) * 2001-09-17 2003-04-24 Infineon Technologies Ag Verfahren zur Herstellung einer Metallschicht auf einem Trägerkörper und Trägerkörper mit einer Metallschicht
US7102522B2 (en) * 2002-12-24 2006-09-05 3M Innovative Properties Company Tamper-indicating radio frequency identification antenna and sticker, a radio frequency identification antenna, and methods of using the same
US6816125B2 (en) 2003-03-01 2004-11-09 3M Innovative Properties Company Forming electromagnetic communication circuit components using densified metal powder
EP2221749A1 (fr) * 2009-02-19 2010-08-25 Nxp B.V. Dispositif RFID doté d'une structure de dérivation dépendant de la permittivité
EP2605332A1 (fr) * 2011-12-15 2013-06-19 Illinois Tool Works Inc. Antenne et procédé de production d'une antenne
FR3006085A1 (fr) * 2013-05-27 2014-11-28 Ask Sa Dispositif radiofrequence muni d'une antenne optimisee

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US4725478A (en) * 1985-09-04 1988-02-16 W. R. Grace & Co. Heat-miniaturizable printed circuit board
FR2614109A1 (fr) * 1987-04-15 1988-10-21 Bleys Dominique Etiquette d'alarme electronique
GB2227887A (en) * 1988-12-24 1990-08-08 Technology Applic Company Limi Making printed circuits
JP3096069B2 (ja) * 1990-08-06 2000-10-10 チェックポイント・マニュファクチュアリング・ジャパン株式会社 共振タグ及びその製造方法
FR2691563B1 (fr) * 1992-05-19 1996-05-31 Francois Droz Carte comprenant au moins un element electronique et procede de fabrication d'une telle carte.
US5286415A (en) * 1992-12-28 1994-02-15 Advanced Products, Inc. Water-based polymer thick film conductive ink
ZA941671B (en) * 1993-03-11 1994-10-12 Csir Attaching an electronic circuit to a substrate.

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Also Published As

Publication number Publication date
WO1997021118A1 (fr) 1997-06-12
AU7689596A (en) 1997-06-27

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