EP1183754A1 - Antenne de couplage a capacite variable - Google Patents
Antenne de couplage a capacite variableInfo
- Publication number
- EP1183754A1 EP1183754A1 EP01903855A EP01903855A EP1183754A1 EP 1183754 A1 EP1183754 A1 EP 1183754A1 EP 01903855 A EP01903855 A EP 01903855A EP 01903855 A EP01903855 A EP 01903855A EP 1183754 A1 EP1183754 A1 EP 1183754A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- capacitor
- support
- ink
- coupling antenna
- 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- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
-
- 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
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
- G06K7/10336—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the near field type, inductive coil
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/005—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with variable reactance for tuning the antenna
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor
- H05K1/162—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor incorporating printed capacitors
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor
- H05K1/165—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor incorporating printed inductors
Definitions
- the present invention relates to contactless transmission and reception systems, and more particularly to a coupling antenna, with a screen-printed capacitor, used in particular in contactless or contactless / contactless smart cards.
- the contactless smart card is an increasingly used system in different sectors. In the transport sector, for example, it has been developed as a means of payment. This is also the case for the electronic purse. Many companies have also developed means of identifying their personnel by contactless smart cards.
- the exchange of information between a contactless card and the associated reading device is carried out by remote electromagnetic coupling between an antenna housed in the contactless card and a second antenna located in the reader.
- the card is equipped with a chip or an electronic module which is connected to the antenna.
- the antenna and the chip are generally located on a plastic dielectric support
- the antenna is obtained by chemical etching of copper or aluminum on the support or winding of a conductive metal wire.
- the chip comprising a memory area and a microprocessor, contains capacitors which define an input capacitance associated with the chip. The optimal functioning of the antenna-chip coupling which must be non-resistive is obtained when the following circuit resonance law is respected:
- LC ⁇ 2 1 (1) in which L represents the inductance of the antenna, C represents the input capacity and ⁇ the pulsation equal to 2 ⁇ f, in which f represents the normalized frequency (for example at 13.56 MHz).
- contactless electronic cards necessarily involves reducing the production costs of the chips used in these cards.
- the founders are led more and more to reduce the dimension of the capacitor integrated in them and thus to reduce the input capacity of the circuit. They can thus produce chips of smaller dimensions.
- the width of the copper tracks must be reduced. This has the effect of increasing the resistance of the antenna, and especially the reliability of the cards is deteriorated because the risk of cuts antenna turns during hot pressure lamination of card bodies is more important.
- the unit cost price of the engraved antenna increases significantly.
- the cost reduction obtained by founders with chips having a lower input capacity is canceled out by this additional cost of the antennas.
- the manufacture and use of cards is therefore not more profitable.
- the object of the invention is to overcome these drawbacks by providing an antenna with a parallel capacity obtained at lower cost, making it possible to obtain a smart card whose cost price is greatly reduced compared to that of smart cards currently on the market, thanks to the decrease in the number of capacitors contained in the chip.
- the invention therefore relates to a coupling antenna connected to a device for transmitting / receiving electromagnetic waves containing one or more integrated capacitors.
- This coupling antenna comprises at least one screen-printed turn on a support constituted by an insulating dielectric substrate and also includes a capacitor screen-printed on the support, connected in parallel, thus making it possible to reduce the capacity supplied by the integrated capacitor (s). (s) in the device, so that the resulting capacity forms a resonant circuit with the turn.
- the invention also relates to a method of manufacturing this antenna which consists in:
- FIG. 1 represents the electrical diagram of a conventional contactless memory card.
- FIG. 2 represents the coupling antenna according to a particular embodiment, after the first step of this embodiment.
- FIG. 3 represents the coupling antenna according to the invention, after the second production step.
- FIG. 4 represents the coupling antenna according to the invention, after the last production step.
- FIG. 5 represents the electrical diagram of a smart card comprising the coupling antenna according to the invention.
- the electrical circuit of a smart card 10 is subdivided into two components: the antenna and the chip.
- the chip 12 has an internal capacitance Cs 14 obtained by means of the capacitors contained in the chip. It also includes an electronic part 16 corresponding to the memory area and to the processor.
- the chip 12 is connected to the antenna 18 via the circuit 10.
- the antenna 18 has an inductance Ls 22 which has a resistance Rs 20.
- Figures 2, 3 and 4 show the antenna after the three main stages of the manufacturing process. According to a particular mode, the antenna consists of two turns in series and a screen-printed capacitor. During the first step of the manufacturing process, shown in Figure 2, the two turns 24 and 26 are screen printed on the support 28 consisting of an insulating dielectric substrate.
- the dielectric substrate constituting the support is made of plastic, paper or glass fabric impregnated with thermosetting resin or crosslinkable by UV radiation.
- the plastic material used is for example polyvinyl chloride (PVC), polyester (PET, PETG), polycarbonate (PC), acrylonitrile-butadiene-styrene (ABS).
- the conductive ink used contains polymers and is loaded with conductive elements which may be metals.
- the ink used is loaded with silver. However, it can also be loaded with copper or carbon.
- the ink can thus contain between 50 and 70% silver in the form of beads or strips.
- the polymers used are polyesters or acrylic resins.
- the ink also contains a solvent which acts as a vehicle. According to a particular embodiment, the solvent used is a glycol ether.
- FIG. 3 shows the antenna at the end of the second stage of the manufacturing process.
- a second screen printing is carried out.
- This second screen printing corresponds to the deposit of dielectric ink constituting the insulating strip 38 which separates the two plates of the capacitor.
- An insulating strip 40 is also screen printed on the electric bridge 36.
- each layer has a thickness of 25 microns.
- This ink contains polymers and cross-links when subjected to UV radiation.
- the polymers can be acrylate resins or unsaturated polyesters. Unlike conductive ink, this ink does not contain solvents.
- the polymers contained in the ink will crosslink when the ink is subjected to UV radiation. This crosslinking causes the ink to harden.
- the geometry of the capacitor is very stable and above all the thickness of this insulating strip does not vary. Consequently, the distance between the two plates does not vary either, which allows the capacitor and therefore the antenna to maintain an optimal quality of operation.
- This ink in order to be sufficiently insulating, must have the highest possible relative permittivity. The value of the permittivity is generally greater than 3.
- the permittivity of the ink used for screen printing the insulating strip is 3.9.
- at least two layers of ink are required. Indeed, after crosslinking, the ink layer has a high porosity which prevents it from having a high insulating power.
- two successive and superimposed layers are screen printed and constitute a strip with a high insulating power.
- the insulating strip 38 is superimposed on the plate 34 and completely covers the latter.
- the insulating strip 40 also covers the electric bridge 36. This strip makes it possible to isolate the electric bridge from the connection made between the free ends of the turns 24 and 26 during the last step of the manufacturing process.
- FIG. 4 shows the antenna after the third and last step of its manufacturing process.
- a third screen printing is carried out, it is the upper plate 42 of the capacitor which is superimposed on the insulating strip 38.
- a connection 44 is screen printed in order to connect the plate 42 to the connection pad 32 and makes it possible to connect the capacitor to the antenna, in parallel.
- the connection 46 of the free ends of the turns 24 and 26 is also carried out by screen printing.
- the antenna thus obtained is constituted by two turns connected in series and by a capacitor.
- the electrical diagram of a smart card incorporating this antenna is shown in Figure 5.
- the electrical circuit 48 is also subdivided into two parts which are the chip 50 and the antenna 52.
- the chip 50 has an electronic part 54 corresponding to the memory area and to the processor, and an internal capacity CS j 56. This capacity is much lower than the internal capacity of a conventional chip. This lower capacitance value is compensated by the value of the capacitance Cs 2 obtained with the screen-printed capacitor of the antenna 52.
- This antenna also has a resistance Rs 60 and an inductance Ls 62 of its own.
- the capacitance Cs 2 has a variable value which depends on the size of the capacitor. According to a preferred embodiment, the capacity Cs 2 of the antenna is greater than the capacity Cs x of the chip.
- a smart card of this type consists of a flat support carrying at least one antenna for coupling with at least one capacitor in parallel, connected to a chip or a module whose internal capacity is low, or even zero according to one embodiment. particular.
- the support is inserted between two card bodies, these card bodies being fixed on each side of the support in order to stiffen these cards.
- These card bodies can be made of plastic.
- the plastic used can be polyvinyl chloride (PVC), polyester (PET, PETG), polycarbonate (PC), or acrylonitrile-butadiene-styrene (ABS).
- PVC polyvinyl chloride
- PET polyester
- PC polycarbonate
- ABS acrylonitrile-butadiene-styrene
- the coupling antenna obtained has several important advantages. Indeed, the fact of making a capacitor external to the chip improves the performance of the card, especially when compared to a traditional card whose chip has the same internal capacity value.
- the use of screen printing makes it possible to obtain a capacitor which has a certain elasticity, which makes it more resistant to the mechanical stresses which the card can undergo during its use. Thus, the value of the capacity does not change due to the deterioration of the capacitor.
- the cost price of a chip card comprising a coupling antenna with a screen-printed capacitor is incomparable with the cost price of a chip card with a more conventional antenna such as an antenna engraved with copper, and a chip with high internal capacity. This reduction in cost is all the more important since the method of manufacturing such a card is not more difficult to implement, since the turns of the antenna and the capacitor or capacitors are screen printed simultaneously.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Toxicology (AREA)
- Health & Medical Sciences (AREA)
- Electromagnetism (AREA)
- General Health & Medical Sciences (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Details Of Aerials (AREA)
- Credit Cards Or The Like (AREA)
- Support Of Aerials (AREA)
- Radar Systems Or Details Thereof (AREA)
- Transceivers (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0000209 | 2000-01-03 | ||
FR0000209A FR2803439B1 (fr) | 2000-01-03 | 2000-01-03 | Antenne de couplage a capacite variable |
PCT/FR2001/000010 WO2001050547A1 (fr) | 2000-01-03 | 2001-01-02 | Antenne de couplage a capacite variable |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1183754A1 true EP1183754A1 (fr) | 2002-03-06 |
Family
ID=8845718
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01903855A Withdrawn EP1183754A1 (fr) | 2000-01-03 | 2001-01-02 | Antenne de couplage a capacite variable |
Country Status (20)
Country | Link |
---|---|
US (1) | US6522308B1 (zh) |
EP (1) | EP1183754A1 (zh) |
JP (1) | JP2003519948A (zh) |
KR (1) | KR100766645B1 (zh) |
CN (1) | CN1175521C (zh) |
AU (1) | AU767701B2 (zh) |
BR (1) | BR0103750A (zh) |
CA (1) | CA2362415C (zh) |
FR (1) | FR2803439B1 (zh) |
HK (1) | HK1048198B (zh) |
ID (1) | ID29786A (zh) |
IL (1) | IL144712A (zh) |
MX (1) | MXPA01008845A (zh) |
NO (1) | NO20014212D0 (zh) |
NZ (1) | NZ513515A (zh) |
RU (1) | RU2258282C2 (zh) |
TR (1) | TR200102544T1 (zh) |
TW (1) | TW526624B (zh) |
WO (1) | WO2001050547A1 (zh) |
ZA (1) | ZA200106760B (zh) |
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FR3006085A1 (fr) | 2013-05-27 | 2014-11-28 | Ask Sa | Dispositif radiofrequence muni d'une antenne optimisee |
US20150054704A1 (en) * | 2013-08-23 | 2015-02-26 | Samsung Sdi Co., Ltd. | Antenna module for terminal device and method for manufacturing the same |
CN104077620A (zh) * | 2013-12-03 | 2014-10-01 | 北京中电华大电子设计有限责任公司 | 一种具有安全功能的非接触智能卡电磁场耦合的实现电路 |
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CN105094231B (zh) * | 2015-07-28 | 2019-03-01 | 京东方科技集团股份有限公司 | 一种显示屏和便携设备 |
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ZA981382B (en) * | 1997-03-07 | 1998-08-24 | Kaba Schliesssysteme Ag | High frequency identification medium with passive electronic data carrier |
GB9806612D0 (en) | 1998-03-28 | 1998-05-27 | Philips Electronics Nv | Communication device |
JPH11353440A (ja) * | 1998-06-09 | 1999-12-24 | Kyodo Printing Co Ltd | コンデンサ及び非接触型icカード |
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- 2000-01-03 FR FR0000209A patent/FR2803439B1/fr not_active Expired - Fee Related
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2001
- 2001-01-02 EP EP01903855A patent/EP1183754A1/fr not_active Withdrawn
- 2001-01-02 CN CNB018000274A patent/CN1175521C/zh not_active Expired - Fee Related
- 2001-01-02 RU RU2001126717/09A patent/RU2258282C2/ru not_active IP Right Cessation
- 2001-01-02 MX MXPA01008845A patent/MXPA01008845A/es active IP Right Grant
- 2001-01-02 NZ NZ513515A patent/NZ513515A/xx not_active Application Discontinuation
- 2001-01-02 WO PCT/FR2001/000010 patent/WO2001050547A1/fr active Application Filing
- 2001-01-02 IL IL14471201A patent/IL144712A/xx not_active IP Right Cessation
- 2001-01-02 ID IDW00200101877A patent/ID29786A/id unknown
- 2001-01-02 KR KR1020017010809A patent/KR100766645B1/ko not_active IP Right Cessation
- 2001-01-02 BR BR0103750-1A patent/BR0103750A/pt not_active Application Discontinuation
- 2001-01-02 JP JP2001550827A patent/JP2003519948A/ja active Pending
- 2001-01-02 AU AU31826/01A patent/AU767701B2/en not_active Ceased
- 2001-01-02 CA CA2362415A patent/CA2362415C/fr not_active Expired - Fee Related
- 2001-01-02 TR TR2001/02544T patent/TR200102544T1/xx unknown
- 2001-06-13 TW TW090114248A patent/TW526624B/zh active
- 2001-08-16 ZA ZA200106760A patent/ZA200106760B/en unknown
- 2001-08-30 NO NO20014212A patent/NO20014212D0/no not_active Application Discontinuation
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EP0918308A2 (en) * | 1991-04-03 | 1999-05-26 | Integrated Silicon Design Pty. Ltd | Article sorting system |
Also Published As
Publication number | Publication date |
---|---|
CA2362415C (fr) | 2010-03-23 |
CA2362415A1 (fr) | 2001-07-12 |
NO20014212L (no) | 2001-08-30 |
FR2803439A1 (fr) | 2001-07-06 |
HK1048198A1 (en) | 2003-03-21 |
FR2803439B1 (fr) | 2002-08-30 |
KR20020004953A (ko) | 2002-01-16 |
CN1175521C (zh) | 2004-11-10 |
IL144712A0 (en) | 2002-06-30 |
TR200102544T1 (tr) | 2002-03-21 |
JP2003519948A (ja) | 2003-06-24 |
MXPA01008845A (es) | 2003-02-12 |
HK1048198B (zh) | 2005-05-27 |
AU3182601A (en) | 2001-07-16 |
ZA200106760B (en) | 2001-12-19 |
RU2258282C2 (ru) | 2005-08-10 |
WO2001050547A1 (fr) | 2001-07-12 |
US6522308B1 (en) | 2003-02-18 |
AU767701B2 (en) | 2003-11-20 |
ID29786A (id) | 2001-10-11 |
NZ513515A (en) | 2004-02-27 |
BR0103750A (pt) | 2001-12-26 |
KR100766645B1 (ko) | 2007-10-15 |
CN1358342A (zh) | 2002-07-10 |
IL144712A (en) | 2005-09-25 |
NO20014212D0 (no) | 2001-08-30 |
TW526624B (en) | 2003-04-01 |
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