JP3879098B2 - Booster antenna for IC card - Google PatentsBooster antenna for IC card Download PDF
- Publication number
- JP3879098B2 JP3879098B2 JP2002136263A JP2002136263A JP3879098B2 JP 3879098 B2 JP3879098 B2 JP 3879098B2 JP 2002136263 A JP2002136263 A JP 2002136263A JP 2002136263 A JP2002136263 A JP 2002136263A JP 3879098 B2 JP3879098 B2 JP 3879098B2
- Prior art keywords
- ic card
- 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
- 239000000758 substrates Substances 0.000 claims description 16
- 239000003990 capacitor Substances 0.000 claims description 14
- 238000004804 winding Methods 0.000 claims description 4
- 239000000463 materials Substances 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 methods Methods 0.000 description 2
BACKGROUND OF THE INVENTION
The present invention relates to a booster antenna for an IC card that can be suitably used for a non-contact type IC card.
An antenna coil is incorporated in a non-contact type IC card together with an IC chip for communication. However, the IC card here includes a so-called IC tag.
The IC chip is integrally mounted on the card substrate together with an antenna coil that matches the operating frequency. The antenna coil is formed in a rectangular frame shape along the outer periphery of the card base of the IC card in order to obtain sufficient transmission / reception sensitivity. Accordingly, the antenna coil can receive radio waves from an external reader / writer and supply operating power to the IC chip, thereby realizing necessary data communication between the IC chip and the reader / writer. Note that the communication method and frequency used for the IC chip are appropriately selected according to the intended use and the required information transmission distance.
[Problems to be solved by the invention]
When such a conventional technique is used, when a plurality of IC cards are used in a stacked manner, the antenna coils of the respective IC cards interfere with each other, and transmission / reception sensitivity may be reduced, or the information transmission distance may be insufficient. was there.
Accordingly, an object of the present invention is to provide a sufficient information transmission distance even when an IC card is used repeatedly by repeatedly bending the booster coil in the long side direction of the card base material in view of the problems of the prior art. Is to provide a booster antenna for an IC card.
[Means for Solving the Problems]
In order to achieve such an object, the structure of the present invention is such that a booster coil that operates as an external antenna of an IC chip is formed on a card substrate, and the booster coil has an effective width that is at least three times the coil width. The gist of the invention is to repeatedly bend the card base material repeatedly in the direction of each long side.
The booster coil can be repeatedly bent continuously in one short side direction of the card base so that the effective width is three times or more the coil width.
The booster coil may be connected in series with an exciting coil that is electromagnetically coupled to the antenna of the IC chip, and the booster coil may have an opening area larger than that of the exciting coil.
Furthermore, the exciting coil and the booster coil can be formed in a two-dimensional spiral, and the winding direction can be made the same.
A booster coil may be provided with a resonance capacitor.
However, in this invention, the coil width of the booster coil refers to the total width including the gap of the parallel conductor pattern arranged in parallel by the number corresponding to the number of turns of the booster coil via the gap, and the effective width refers to such a parallel conductor. The maximum width at the bent part of the pattern.
According to the configuration of the invention, the booster coil that operates as the external antenna of the IC chip can receive the radio wave from the external reader / writer and transmit it to the IC chip, and the response data from the IC chip can be transmitted to the external reader. Can be communicated to the writer. In addition, since the booster coil is repeatedly bent continuously in an effective width of three times or more of the coil width, even if another IC card having a rectangular antenna coil is stacked, the antenna along the long side of the card base Since the linear long side of the coil is completely crossed diagonally, there is very little mutual interference with the antenna coil of another IC card, and almost no decrease in transmission / reception sensitivity or decrease in information transmission distance is observed. However, the booster coil is formed on the card base so as to realize the maximum opening area within the effective area of the card base.
The booster coil can be more effectively suppressed from mutual interference with the antenna coil of another IC card by repeatedly and continuously bending the booster coil in the short side direction of the card base.
The exciting coil connected in series with the booster coil acts as a secondary coil for the antenna of the IC chip, and can amplify the signal according to the turn ratio of both.
The booster coil can easily realize sufficiently high transmission / reception sensitivity by making the opening area larger than that of the exciting coil. Note that the exciting coil preferably has a minimum opening area necessary for installing the IC chip therein in order to electromagnetically couple the IC coil to the antenna of the IC chip sufficiently densely.
The exciting coil and the booster coil formed in a two-dimensional spiral shape are arranged so as not to overlap each other on the card base material, and can be formed in a predetermined number of turns to realize a necessary inductance.
The exciting coil and the booster coil can be easily formed by using one conductive pattern or wire by making the winding direction the same.
The booster coil can be provided with a resonance capacitor to increase the Q at the time of resonance and realize a sharp frequency characteristic.
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The booster antenna for an IC card is formed by forming an exciting coil L1 and a booster coil L2 connected in series with the exciting coil L1 on a card substrate CD (FIGS. 1 and 2).
The card substrate CD is formed in a thin card shape by an insulating material such as a paper material or a synthetic resin material. The exciting coil L1 and the booster coil L2 are each formed as a two-dimensional spiral parallel conductor pattern having the same winding direction on the card substrate CD by a conductive pattern made by a technique such as printing or etching, or by a single wire. Is formed. The excitation coil L1 is formed outside the booster coil L2, and an IC chip CP on which the antenna A is mounted on the chip body IC is installed in the excitation coil L1.
The booster coil L2 has a larger opening area than the exciting coil L1, and has a larger number of turns than the exciting coil L1. The booster coil L2 is repeatedly and continuously bent so as to have a bending angle θ≈90 ° in each long side direction of the card substrate CD to form bent portions G1 and G1, and one short side of the card substrate CD. Also in the side direction, it is repeatedly bent continuously so that the bending angle θ≈90 °, thereby forming another bent portion G2. The effective widths W1 and W2 of the booster coil L2 at the bent portions G1 and G2 are such that W2> W1 ≧ 3Wa with respect to the coil width Wa. A resonance capacitor C is formed in the booster coil L2, and is attached to the booster coil L2. Capacitor C can form a parallel conductor pattern having a predetermined length and a predetermined interval via opposing comb-like conductive patterns, thereby ensuring a required capacity.
The exciting coil L1 is electromagnetically coupled to the antenna A of the IC chip CP, and the booster coil L2 is connected in series to the exciting coil L1 through the jumper wire B1 together with the capacitor C. However, the symbol M in FIG. 2 indicates the electromagnetic coupling between the antenna A and the exciting coil L1. The exciting coil L1 has a small opening area corresponding to the outer size of the IC chip CP and is electromagnetically coupled to the antenna A sufficiently densely.
The booster coil L2 receives a radio wave S1 from an external reader / writer (not shown), supplies high frequency power to the chip body IC of the IC chip CP via the excitation coil L1 and the antenna A, and activates the chip body IC. Data contained in the radio wave S1 can be transmitted to the chip body IC. At this time, the antenna A is excited by the exciting coil L1. Further, the IC chip CP responds to data included in the radio wave S1 from the reader / writer as necessary, and load-modulates the radio wave S1 according to the response data. The content of the load modulation is transmitted from the antenna A to the booster coil L2 via the exciting coil L1, and is transmitted to the reader / writer via the booster coil L2. That is, the booster coil L2 operates as an external antenna of the IC chip CP via the exciting coil L1 and the antenna A, and can increase the information transmission distance of the IC chip CP.
Even if the IC card having the booster coil L2 is used with the card base CDa of another IC card superimposed on the card base CD, there is almost no decrease in the information transmission distance with the reader / writer RW (FIG. 3). Another card substrate CDa is formed with a rectangular frame-shaped antenna coil La along the outer periphery. The antenna coil La is connected to the IC on the card substrate CDa via a resonance capacitor Ca, for example. Connected to the chip CPa. Therefore, when the card bases CD and CDa are overlapped, the booster coil L2 has the bent portions G1, G1, and G2 completely and completely crossing the straight sides of the antenna coil La (FIG. 4). Mutual interference can be minimized.
When the embossed portions CD1 and CD1 for displaying the card number, name, expiration date, etc. are provided on the card substrate CD (FIG. 5), the booster coil L2 is formed avoiding the embossed portions CD1 and CD1. Further, the booster coil L2 may omit the bent portion G2 in the short side direction of the card substrate CD (the same figure). Further, the capacitor C may realize a required capacity by connecting a plurality of capacitors C1, C2,.
The exciting coil L1 may be provided inside the booster coil L2 (FIG. 6), and the resonance capacitor C may be formed outside the booster coil L2 (FIG. 6). Further, the booster coil L2 may be repeatedly bent continuously in the short side direction of the card substrate CD a plurality of times to form the bent portion G2 (the same figure). In FIG. 6, the effective width W2 of the bent portion G2 is set such that W2≈W1 ≧ 3Wa.
In the above description, the booster coil L2 may be bent at θ <90 ° in place of the bending angle θ≈90 ° at each of the bent portions G1 and G2 (FIG. 7A), It may be bent at> 90 ° ((B) in the figure). Further, the bending angle θ may be changed discontinuously ((C) in the figure) or may be changed continuously ((D) in the figure). However, in FIG. 7, the booster coil L2 and the antenna coil La are shown ignoring their coil widths.
The exciting coil L1 and the booster coil L2 may be formed on the card substrate CD by one insulating wire. Further, the booster coil L2 may be directly connected to the IC chip CP without the antenna A together with the resonance capacitor C (FIG. 8) to operate as an external antenna of the IC chip CP. However, the IC chip CP at this time may incorporate a coupling capacitor, and may be connected in series to the external capacitor C (FIG. 1A) or in parallel ( (B)).
【The invention's effect】
As described above, according to the present invention, the booster coil formed on the card base material is repeatedly bent continuously so that the booster coil minimizes mutual interference with the antenna coil of another IC card. Therefore, there is an excellent effect that a sufficient information transmission distance can be easily obtained even if the IC cards are stacked and used.
[Brief description of the drawings]
FIG. 1 is a schematic plan view of the overall configuration. FIG. 2 is an equivalent circuit diagram. FIG. 3 is an explanatory diagram of a usage state. FIG. 4 is a schematic diagram of a usage state. )
FIG. 6 is a view corresponding to FIG. 1 showing another embodiment (2).
FIG. 7 is a schematic explanatory diagram showing another embodiment. FIG. 8 is an equivalent circuit explanatory diagram showing another embodiment.
CP ... IC chip A ... antenna CD ... card substrate Wa ... coil width W1, W2 ... effective width L1 ... excitation coil L2 ... booster coil C ... capacitor
- A booster coil that operates as an external antenna of the IC chip is formed on the card substrate, and the booster coil is continuously repeated in each long side direction of the card substrate so that the effective width is three times or more of the coil width. booster antenna for IC card, characterized in that for to bend.
- 2. The booster antenna for an IC card according to claim 1, wherein the booster coil is repeatedly bent continuously in one short side direction of the card base so as to have an effective width of three times or more of the coil width. .
- 3. The booster antenna for an IC card according to claim 1, wherein an excitation coil that is electromagnetically coupled to the antenna of the IC chip is connected in series to the booster coil.
- 4. The booster antenna for an IC card according to claim 3, wherein the booster coil has an opening area larger than that of the exciting coil.
- 5. The booster antenna for an IC card according to claim 3, wherein the exciting coil and the booster coil are formed in a two-dimensional spiral shape.
- 6. The booster antenna for an IC card according to claim 5, wherein the exciting coil and the booster coil have the same winding direction.
- 7. The booster antenna for an IC card according to claim 1, wherein a resonance capacitor is attached to the booster coil.
Priority Applications (1)
|Application Number||Priority Date||Filing Date||Title|
|JP2002136263A JP3879098B2 (en)||2002-05-10||2002-05-10||Booster antenna for IC card|
Applications Claiming Priority (1)
|Application Number||Priority Date||Filing Date||Title|
|JP2002136263A JP3879098B2 (en)||2002-05-10||2002-05-10||Booster antenna for IC card|
|Publication Number||Publication Date|
|JP2003332820A JP2003332820A (en)||2003-11-21|
|JP2003332820A5 JP2003332820A5 (en)||2005-09-08|
|JP3879098B2 true JP3879098B2 (en)||2007-02-07|
Family Applications (1)
|Application Number||Title||Priority Date||Filing Date|
|JP2002136263A Expired - Fee Related JP3879098B2 (en)||2002-05-10||2002-05-10||Booster antenna for IC card|
Country Status (1)
|JP (1)||JP3879098B2 (en)|
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- 2002-05-10 JP JP2002136263A patent/JP3879098B2/en not_active Expired - Fee Related
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