JP4186149B2 - Auxiliary antenna for IC card - Google Patents

Auxiliary antenna for IC card Download PDF

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Publication number
JP4186149B2
JP4186149B2 JP34667499A JP34667499A JP4186149B2 JP 4186149 B2 JP4186149 B2 JP 4186149B2 JP 34667499 A JP34667499 A JP 34667499A JP 34667499 A JP34667499 A JP 34667499A JP 4186149 B2 JP4186149 B2 JP 4186149B2
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JP
Japan
Prior art keywords
coil
main coil
ic card
antenna
main
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.)
Expired - Fee Related
Application number
JP34667499A
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Japanese (ja)
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JP2001168628A (en
Inventor
詩朗 杉村
Original Assignee
株式会社エフ・イー・シー
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 株式会社エフ・イー・シー filed Critical 株式会社エフ・イー・シー
Priority to JP34667499A priority Critical patent/JP4186149B2/en
Publication of JP2001168628A publication Critical patent/JP2001168628A/en
Application granted granted Critical
Publication of JP4186149B2 publication Critical patent/JP4186149B2/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/0775Constructional 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
    • G06K19/07756Constructional 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 the connection being non-galvanic, e.g. capacitive

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an auxiliary antenna for an IC card that can be suitably used for a non-contact type IC card.
[0002]
[Prior art]
A non-contact IC card may incorporate an antenna-mounted communication IC module.
[0003]
In an antenna-mounted IC module, a two-dimensional coil-shaped antenna that conforms to a use frequency is integrally mounted on a communication IC chip. Therefore, the antenna of the IC module can receive incoming radio waves from outside and supply operating power to the IC chip, and can transmit and receive radio waves for information transmission with external devices.
[0004]
[Problems to be solved by the invention]
According to such a conventional technique, the antenna of the IC module is formed in a very small size for mounting on the IC chip, so that sufficient transmission / reception sensitivity cannot be obtained, and the information transmission distance by the IC card is sufficiently increased. There was a problem that I could not.
[0005]
SUMMARY OF THE INVENTION In view of the problems of the prior art, an object of the present invention is to provide a main coil that resonates at a use frequency in an IC card body, thereby improving the transmission / reception sensitivity and increasing the information transmission distance. It is to provide an auxiliary antenna.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the structure of the present invention comprises a multiple helical main coil provided on the IC card body and a sub-coil formed in one turn with a gap and electromagnetically coupled to the main coil. The main coil resonates with the sub-coil at the operating frequency, the opening surface of the sub-coil is included in the opening surface of the main coil, and an antenna-mounted communication IC module is installed on the opening surface of the sub-coil. This is the gist.
[0007]
In addition, the main coil and the subcoil can be electrically insulated.
[0008]
Further, the main coil can be provided with a capacitor for resonance by a parallel pattern, and the gap of the sub coil can form a capacitor for resonance together with the capacitor of the main coil.
[0009]
The subcoil may be formed of a conductive sheet material.
[0010]
Furthermore, the subcoil can be disposed on the main coil.
[0011]
[Action]
According to the configuration of the invention, the main coil generates a large electromotive force in the antenna of the IC module by resonating with an incoming radio wave from the outside by installing an antenna-mounted communication IC module on the opening surface. At the same time, it is possible to efficiently transmit radio waves from the IC module to the outside, increase the transmission / reception sensitivity of the antenna of the IC module, and increase the information transmission distance by the IC card. This is because the main coil has a much larger opening area than the antenna of the IC module on the IC chip.
[0012]
The main coil formed in multiple spirals can increase the inductance and reduce the required capacitance of the resonance capacitor.
[0013]
The main coil can accurately form a resonance capacitor by a parallel pattern, and an external capacitor can be omitted.
[0014]
By electromagnetically coupling the secondary coil having a high Q to the main coil, the secondary coil substantially increases the conductor diameter of the main coil, improves the apparent Q of the main coil, and sharpens the resonance characteristics as a whole, Transmission / reception sensitivity at the operating frequency can be further increased. The subcoil is preferably electromagnetically coupled to the main coil as closely as possible, and is preferably arranged so that the opening surface of the subcoil is included in the opening surface of the main coil. Moreover, it is preferable to form the opening surface of a subcoil in the required minimum area where the IC module for communication can be installed.
[0015]
By forming the secondary coil in one turn with a gap, the maximum Q can be easily realized. The gap at this time forms a part of the resonance capacitor. Further, the secondary coil can be easily formed in one turn with a gap by cutting a conductive sheet material such as copper, aluminum, or silver into a predetermined shape.
[0016]
If the subcoil is laminated on the main coil, the main coil and subcoil can minimize the occupied area on the IC card body. The subcoil is laminated on all or part of the conductor of the main coil. The subcoil at this time is, for example, an insulating film of an insulating wire material forming the main coil, or between the main coil and the subcoil. It shall be electrically insulated from the main coil through an insulating film or the like interposed therebetween.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0018]
The auxiliary antenna for the IC card includes a main coil L on the IC card main body 11 (FIG. 1). On the IC card main body 11, a sub coil D that is electromagnetically coupled to the main coil L is disposed.
[0019]
The IC card main body 11 is formed in a thin card shape by an insulating material such as a paper material or a synthetic resin material. The main coil L is formed in multiple spirals on the IC card body 11 by an insulating wire. The main coil L draws both ends of the wire into the opening L1 of the main coil L to form a parallel pattern having a predetermined length and a predetermined interval, whereby the resonance capacitor C is placed on the IC card main body 11. Forming.
[0020]
The subcoil D is formed in a size of about half of the pattern area of the main coil L by a conductive sheet material. The sub-coil D has an opening surface D1 smaller than the opening surface L1 of the main coil L. The opening surface D1 has a gap D2, and the sub-coil D is formed in one turn with the gap D2. ing. The subcoil D is laminated on the main coil L so that the opening surface D1 is positioned within the opening surface L1 of the main coil L. Further, the main coil L and the subcoil D are insulated from each other via an insulating film of a wire material of the main coil L. However, the opening surfaces L1 and D1 refer to internal regions surrounded by the main coil L and the subcoil D, respectively.
[0021]
An IC module M for communication is installed on the opening surface D1 of the secondary coil D via the base material B (FIGS. 1 and 2). In the IC module M, a two-dimensional coiled antenna A is integrally mounted on a communication IC chip P, and is formed into an antenna mounting type. The IC module M is installed on the IC card main body 11 in the opening surface L1 of the main coil L via the opening surface D1 of the subcoil D. The communication IC chip P includes capacitors Ca and Cb for resonance and impedance matching, and a main body chip IC (FIG. 3). The antenna A is connected to the main body chip IC via the capacitors Ca and Cb. It is connected.
[0022]
The main coil L and the subcoil D are electromagnetically coupled to each other and resonate with the operating frequency as a whole. However, at this time, the gap D2 of the subcoil D forms a resonance capacitor together with the capacitor C of the main coil L, and the subcoil D has a high Q. Further, the antenna A on the IC module M also resonates at the used frequency. Therefore, the antenna A has sufficiently high transmission / reception sensitivity through the main coil L having a large opening area, and the information transmission distance of the IC module M can be increased. On the other hand, when the main coil L resonates at the operating frequency, the apparent Q becomes high due to the presence of the sub-coil D, and as a whole, sharp resonance characteristics are obtained, and high transmission / reception sensitivity can be obtained.
[0023]
In the above description, the main coil L may be directly formed on the IC card main body 11 by a technique such as printing or etching instead of using an insulating wire, and the main coil L is insulated separately from the IC card main body 11. It may be formed on a sheet and stuck on the IC card main body 11. Further, the base material B for the IC module M can be omitted, and the opening surface D1 of the auxiliary coil D can be further reduced.
[0024]
[Other embodiments]
The resonance capacitor C combined with the main coil L is formed by a parallel pattern, but its physical form can be arbitrarily changed (FIG. 4). For example, FIGS. 4A and 4B are formed in a square shape and a circular shape, respectively, and FIG. 4C shows a shape formed in a comb shape. The capacitor C may be formed outside the main coil L in addition to being formed on the opening surface L1 inside the main coil L.
[0025]
Moreover, the subcoil D can change the shape and arrangement | positioning arbitrarily. For example, the subcoil D may be laminated on the entire main coil L (FIG. 5A), or may be provided in the opening surface L1 of the main coil L (FIG. 5B). Further, the secondary coil D may be attached to the back side of the IC card main body 11 and electromagnetically coupled to the main coil L via the IC card main body 11 ((C) in the figure). The sub-coil D may be omitted altogether, and the IC module M at this time may be installed in the opening L1 of the main coil L sufficiently close to the main coil L or on the main coil L. It is good to install in.
[0026]
【The invention's effect】
As described above, according to the present invention, by providing the main coil that resonates at the operating frequency on the IC card body, the main coil generates a large electromotive force in the antenna of the communication IC module, and the IC module Therefore, it is possible to increase the transmission / reception sensitivity of the antenna of the IC module and to increase the information transmission distance by the IC card.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of the overall configuration. FIG. 2 is an enlarged side view corresponding to the arrow X in FIG. 1. FIG. 3 is an equivalent circuit diagram. Schematic explanatory diagram showing another embodiment [Explanation of symbols]
M ... IC module A ... Antenna L ... Main coil D ... Subcoil L1, D1 ... Opening surface D2 ... Gap C ... Capacitor 11 ... IC card body

Claims (6)

  1. And multiple spiral primary coil Ru provided on the I C card body is formed in one turn with a gap, it comprises a secondary coil for electromagnetically coupling to the main coil, the main coil, together with the auxiliary coil The sub-coil opening surface is included in the opening surface of the main coil, and an antenna-mounted communication IC module is installed on the opening surface of the sub-coil. Auxiliary antenna for IC card.
  2. 2. The auxiliary antenna for an IC card according to claim 1 , wherein the main coil and the sub coil are electrically insulated .
  3. 3. The auxiliary antenna for an IC card according to claim 1 , wherein the main coil includes a capacitor for resonance with a parallel pattern.
  4. 4. The auxiliary antenna for an IC card according to claim 3 , wherein the gap of the sub coil forms a resonance capacitor together with the capacitor of the main coil .
  5. The secondary coil is electrically conductive auxiliary antenna of claims 1 to an IC card according to any one of claims 4 and forming a sheet material.
  6. The auxiliary coil, the auxiliary antenna for IC card according to any one of claims 1 to 5, characterized in that arranged stacked in the main coil.
JP34667499A 1999-12-06 1999-12-06 Auxiliary antenna for IC card Expired - Fee Related JP4186149B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP34667499A JP4186149B2 (en) 1999-12-06 1999-12-06 Auxiliary antenna for IC card

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP34667499A JP4186149B2 (en) 1999-12-06 1999-12-06 Auxiliary antenna for IC card

Publications (2)

Publication Number Publication Date
JP2001168628A JP2001168628A (en) 2001-06-22
JP4186149B2 true JP4186149B2 (en) 2008-11-26

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EP2688145A1 (en) 2012-01-30 2014-01-22 Murata Manufacturing Co., Ltd. Wireless ic device
WO2013125610A1 (en) 2012-02-24 2013-08-29 株式会社村田製作所 Antenna device and wireless communication device
JP5304975B1 (en) 2012-04-13 2013-10-02 株式会社村田製作所 RFID tag inspection method and inspection apparatus

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