JP2003069335A - Auxiliary antenna - Google Patents

Auxiliary antenna

Info

Publication number
JP2003069335A
JP2003069335A JP2001257621A JP2001257621A JP2003069335A JP 2003069335 A JP2003069335 A JP 2003069335A JP 2001257621 A JP2001257621 A JP 2001257621A JP 2001257621 A JP2001257621 A JP 2001257621A JP 2003069335 A JP2003069335 A JP 2003069335A
Authority
JP
Japan
Prior art keywords
loop
antenna
substrate
ic card
auxiliary 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Withdrawn
Application number
JP2001257621A
Other languages
Japanese (ja)
Inventor
Mitsuhiro Okada
充弘 岡田
Original Assignee
Hitachi Kokusai Electric Inc
株式会社日立国際電気
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 Hitachi Kokusai Electric Inc, 株式会社日立国際電気 filed Critical Hitachi Kokusai Electric Inc
Priority to JP2001257621A priority Critical patent/JP2003069335A/en
Publication of JP2003069335A publication Critical patent/JP2003069335A/en
Withdrawn legal-status Critical Current

Links

Abstract

(57) [Summary] [Problem] To provide an auxiliary antenna capable of freely setting an expansion or non-expansion of an communicable area of an IC card even if a switch is not provided on the IC card. SOLUTION: An auxiliary antenna 10 of the present invention has a card shape, and an IC card receives a high-frequency magnetic field from a reader / writer of a data communication system to generate a power supply for operation. Are arranged for the purpose of expanding a communicable area in which signals can be transmitted and received without contact with a reader / writer. This auxiliary antenna includes a loop-shaped antenna 11 and a capacitor 12 forming a resonance circuit;
A switch 13 for selecting the function or non-function of the loop antenna. Therefore, the IC card itself does not have a switch for switching between functions and non-functions,
When the antenna is integrated with the auxiliary antenna, there is no need to put in and out of the shield case, and the communicable area can be freely selected by the switch of the auxiliary antenna.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary antenna for a data communication system using an IC card, and more particularly,
The IC card receives a high-frequency magnetic field from the reader / writer of the data communication system to generate a power supply for operation, and the generated power expands the communicable area where the IC card can exchange signals with the reader / writer in a non-contact manner. The present invention relates to a card-shaped auxiliary antenna arranged for the purpose.

[0002]

2. Description of the Related Art FIG. 14 is a diagram for explaining the configuration of a conventional data communication system using a non-contact information medium (IC card, IC tag, etc.). In the data communication system of FIG. 14, the IC card 70 having the IC chip 71 built therein and the reader / writer 80 are arranged so as to be orthogonal to each other in the vertical direction and face each other in parallel, and a high-frequency magnetic field passing through both of them. Communicate via MF. in this case,
The control unit 89 of the reader / writer 80 uses the loop antenna 8
1, the high frequency magnetic field MF is transmitted, the IC card 70 receives the high frequency magnetic field MF via the loop antenna 72,
Electric power for its own operation is generated by electromagnetic induction by the high frequency magnetic field MF, a transmission signal by the high frequency magnetic field MF is received, and a response based on the transmission signal is performed via the loop antennas 72 and 81.

In such a data communication system,
In order to expand the communicable area between the IC card 70 and the reader / writer 80, it is possible to use an auxiliary antenna (booster) 90 as shown in FIG.
No. 0-138621. in this case,
The auxiliary antenna 90 strengthens the exchange of the high-frequency magnetic field between the IC card 70 and the reader / writer 80 and enlarges the communicable area between them. This auxiliary antenna 9
As shown in FIG. 16, 0 is composed of a loop antenna 91 and a capacitor 92, and is set to resonate at the frequency of the high frequency magnetic field used. In this case, the auxiliary antenna 90 needs to be assembled together with the IC card 70 shown in FIG. 15 and arranged so as to face the reader / writer 80 in parallel. Of course, the auxiliary antenna 90 may be incorporated in the reader / writer side.

As described above, it is desirable that the communicable area is large for the desired communication. On the other hand, the IC card is used to prevent information leakage and unnecessary interference with different systems. In some cases, depending on the user's request, it may not be desired to make the IC card react to the reader / writer. For this purpose, for example, JP 20
There is an invention as disclosed in Japanese Patent Publication No. 00-306066. In the present invention, as shown in FIGS. 17 and 18, the switch 7 for switching the antenna 71 housed in the IC cards 70a and 70b to the open or short circuit state.
3, 74 are provided. In other words, if you do not want the IC card to react to the reader / writer, switch 7
3 is turned off or the switch 74 is turned on.

[0005]

In the above-mentioned conventional data communication system, the auxiliary antenna is carried together with the IC card so as to increase the communicable area between the IC card and the reader / writer, while In order to cut off unnecessary communication, the IC card is put in a shield case for cutting off high frequency magnetic fields. In this case, it is not very convenient to put the IC card and the auxiliary antenna in and out of the shield case. Therefore, in some cases, the function of the antenna of the IC card is disabled by the switch provided in the IC card for communication interruption, but there is a problem that it cannot be applied to the IC card without the switch. Further, the IC card and the reader / writer have to face each other in parallel, and there is a problem that it is not possible to deal with the case where the facing is difficult.

The present invention has been made to solve the above-mentioned problems, and even if the IC card is not provided with a switch, the communicable area of the IC card is freely expanded or is not expanded. It is an object of the present invention to provide an auxiliary antenna that can be set and that can expand the communicable area of a data communication system without facing the IC card and the reader / writer in parallel.

[0007]

In order to solve the above-mentioned problems, the present invention generates and generates a power supply for operation by receiving a high frequency magnetic field from a reader / writer of a data communication system by an IC card. A card-shaped auxiliary antenna, which is arranged for the purpose of expanding a communicable area in which an IC card can send and receive signals to and from a reader / writer in a non-contact manner by a power supply. It has a capacitor to be formed and a switch for switching the loop-shaped antenna to function or not to function as an antenna.

With such a configuration, if the loop antenna functions as an antenna by appropriately switching the switch of the auxiliary antenna, the loop antenna forms a capacitor and a resonance circuit, and the auxiliary antenna Can enhance the high-frequency magnetic field from the reader / writer and deliver it to the IC card, and can expand the communicable area. Further, if the loop antenna is not made to function as an antenna, the communicable area can be kept unexpanded. Since this switch is performed by a switch, it can be operated externally, and there is no need to put it in and out of the shield case as in the conventional case.

In the embodiment of the present invention, the high frequency magnetic field from the reader / writer of the data communication system is I
A card-shaped auxiliary antenna 10 arranged for the purpose of expanding the communicable area in which the C card receives and generates power for operation, and the generated power allows the IC card to exchange signals with the reader / writer in a non-contact manner. Therefore, it has a loop-shaped antenna 11, a capacitor 12 that forms a resonant circuit with the loop-shaped antenna 11, and a switch 13 that causes the loop-shaped antenna 11 to function as an antenna, or switches so as not to function.

Further, according to the present invention, the IC card receives the high-frequency magnetic field from the reader / writer of the data communication system to generate a power source for operation, and the generated power source allows the IC card to exchange signals with the reader / writer. A card-shaped auxiliary antenna arranged for the purpose of expanding a communicable area, the first substrate having a loop-shaped pattern and a spiral pattern formed inside the loop-shaped pattern, , A second substrate assembled to the first substrate so that the patterned surface of the first substrate is brought into contact with the patterned surface of the first substrate so as to be slidable between the first and second positions. And a capacitor connected to the looped pattern of the first substrate to form a resonant circuit, the pattern of the second substrate at the first position,
Overlapping on the pattern of the first substrate, the loop-shaped pattern of the first substrate enables formation of a resonance circuit, and the spiral pattern has substantially the same shape, and at the second position. Provides a shield function of stopping the formation of the resonance circuit by short-circuiting the pitches of the loop-shaped pattern and the spiral-shaped pattern of the first substrate with its own pattern.

According to this structure, when the second substrate of the auxiliary antenna is set to the first position, the loop-shaped antenna of the first substrate of the auxiliary antenna forms a capacitor and a resonance circuit, and the auxiliary antenna is formed. Can enhance the high-frequency magnetic field from the reader / writer and deliver it to the IC card, and can expand the communicable area. Further, if the second substrate of the auxiliary antenna is set to the second position, the second substrate of the auxiliary antenna short-circuits all the loop pattern and the spiral pattern of the first substrate,
Since the second substrate exerts a shield function in which the formation of the resonance circuit is stopped, it is possible to block the transmission of the high frequency magnetic field to the IC card.

Further, according to the present invention, the IC card receives a high frequency magnetic field from the reader / writer of the data communication system to generate a power supply for operation, and the generated power supply causes the IC card to signal the reader / writer in a non-contact manner. A card-shaped auxiliary antenna arranged for the purpose of expanding a communicable area capable of transmitting and receiving data, the first loop being arranged on one side of the center line and the opposite side of the first loop. Second
And a connecting line that connects the first loop and the second loop across the center line and forms one loop antenna as a whole.

According to this structure, when the connecting lines of the auxiliary antenna are parallel lines, by folding at the center line,
The antenna function of the loop antenna can be eliminated without a switch, and the antenna function can be restored by opening at the center line. Further, by lengthening the connection line, it is possible to separate the position where the reader / writer functions from the position where the IC card functions. Further, when the connection lines intersect, the loop antenna becomes a double winding when folded, and can transmit stronger induced power.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing a first embodiment of an auxiliary antenna of a data communication system of the present invention, FIG. 2 is a diagram showing a second embodiment which is a modification of the first embodiment, and FIG. FIG. 4 is a diagram showing a third embodiment of the auxiliary antenna of the data communication system of the present invention, FIG. 4 is a diagram for explaining the pattern of the second substrate of the auxiliary antenna of FIG. 3, and FIG. FIG. 6 is a diagram for explaining a case where the antenna is made to not function, and FIG.
Showing the auxiliary antenna of the embodiment of FIG. 7, FIG.
FIG. 9 shows the fifth, sixth, and seventh embodiments of the present invention, and FIGS. 10, 11, and 12 show the eighth, ninth, and tenth embodiments of the present invention, respectively. FIG. Note that these auxiliary antennas are substantially the same as those shown in FIG.
The card reader, the auxiliary antenna, and the IC card are faced to each other in parallel in the data communication system as shown in FIG. 6, but the auxiliary antenna shown in FIGS. 6 to 13 is auxiliary at a position different from the reader / writer and the IC card. You may face with an antenna.

The auxiliary antenna 10 of the first embodiment of the present invention shown in FIG. 1 has a card shape, and has a loop antenna 11, a capacitor 12, and a switch 13. The loop antenna 11 is a conductor of metal foil (copper, silver, aluminum, etc.), and when the switch 13 is turned on, it forms a loop and cooperates with the capacitor 12 to form a resonance circuit. -Expand the communicable area for data communication with the writer. On the other hand, when the switch 13 is off, the loop antenna 11 does not form a resonance circuit, and the communicable area between the IC card and the reader / writer is not expanded. That is, the user can operate the switch 13 according to his or her will to expand the communicable area. This auxiliary antenna 10
It may be incorporated into an IC card case or directly into an IC card. It may also be incorporated on the reader / writer side. In the auxiliary antenna 20 of the second embodiment shown in FIG. 2, the switch 23 is arranged so as to have a function opposite to that of the switch 13 shown in FIG.
When 3 is off, a resonance circuit is formed to expand the communicable area between the IC card and the reader / writer.

Auxiliary antenna 3 of the third embodiment of FIG.
0 is a loop pattern (pa, pb,
pc, pd, pe) and a spiral pattern (pf, ph in FIG. 3) along a quadrangle formed concentrically with the first substrate 31 and the pitch of the spiral of the first substrate 31 And a second substrate 32 on which a plurality of parallel linear patterns as shown in FIG. 4 are formed, and the first substrate 31 are connected to the loop pattern, and the resonance circuit cooperates with the loop pattern. And a capacitor 33 forming Both of the above-mentioned patterns are formed so that each side is along a quadrangle, but the invention is not limited to this, and may be, for example, a spiral shape along an ellipse. In the above case, the first substrate 31 and the second substrate 32 have their pattern surfaces facing each other, and the second substrate 32 is the first substrate 3
It is assembled so that it can be slid over the top 1 in the direction indicated by the arrow DD. The pattern of the second substrate 32 has the same shape (same width, pitch, and inclination) as the pattern of the first substrate 31 surrounded by the outer shape of the second substrate 32 in FIG. In order to facilitate on / off switching, it is preferable to form the pattern slightly thicker (wider) than the pattern of the first substrate.

In the case of FIG. 3, the pattern of the first substrate 31 and the pattern of the second substrate 32 are overlapped (off state), and the loop pattern of the first substrate and the capacitor 33 are a resonance circuit. Form an IC card and a reader
Expand the communication range with the writer. In this case, the spiral pattern does nothing special. FIG. 5 shows a case where the second substrate 32 is slid from the state of FIG. 3 by one pitch of the spiral downward in the figure. In this case, the pattern of the second substrate 32 moves between the patterns (between pitches) of the loop-shaped pattern and the square spiral pattern of the first substrate, and the first substrate 31 has the first pattern at the central portion. All patterns on the substrate 31 are short-circuited (ON state). Therefore, in the first substrate 31, the capacitor 33 does not form a normal resonance circuit, and the pattern is a collection of small loops, and when used in combination with an IC card, shields against a high frequency magnetic field such as a reader / writer. Be effective. The insulating material for the substrate used in this example is preferably synthetic resin, paper or insulating ceramic, and the pattern material is
It is preferable that a metal foil such as copper, silver or aluminum is plated with gold. It is also preferable to apply rust preventive oil to the pattern surface.

The auxiliary antenna 40 according to the fourth embodiment of the present invention shown in FIG.
It is formed into a card that can be folded. Folding curve 49
The first and second loops 41, 42 on the left and right parts of the
And the first and second loops 41 and 42 are connected by two parallel connecting lines 43 that cross the folding curve 49, and are formed as one loop as a whole. Therefore,
As shown in FIG. 6, if the auxiliary antenna 40 together with the IC card is faced to the reader / writer with the folding curve 49 open, a high frequency magnetic field from the reader / writer induces a high frequency current by the first loop 41. Then, due to this high frequency current, a high frequency magnetic field is generated from the second loops having different positions and is supplied to the IC card.

The auxiliary antenna 40 of the embodiment of FIG.
For example, in the case where the auxiliary antenna 40 is overlapped with the IC card and held, the auxiliary antenna 40 can be prevented from functioning by folding and folding the auxiliary antenna 40 at the folding line 49. That is, even if the switch is not used, the same action as the switch can be obtained by folding. Of course, with the function as shown in FIG.
A switch 4 for stopping the function as shown in FIGS. 7 and 8.
It can be easily understood from the above description that the capacitors 5, 46 may be arranged and the capacitor 47 for resonance may be arranged as shown in FIG.

Further, regarding the fourth to seventh embodiments shown in FIGS. 6 to 9, the auxiliary antenna 40 is arranged on the reader / writer side when the folding curve 49 is not used, and the auxiliary antenna 40 is arranged from the reader / writer. The high frequency magnetic field may be received by the first loop, and the IC card may face the second loop 42. In this case, the auxiliary antenna 4
The reader / writer and the IC card can communicate at different positions via 0, 40a, 40b, 40c,
The arrangement position of the reader / writer can be flexibly set. FIG. 10 briefly shows this setting method corresponding to the auxiliary antenna 40 of FIG. That is, in the auxiliary antenna 50 according to the eighth embodiment, the first loop and the second loop are arranged at positions physically separated from each other and are connected to each other by long parallel connection lines 53. There is. As the connecting wire 53, two electric wires, a coaxial cable, a parallel feeder wire or the like may be used.

The auxiliary antenna 60 of the ninth embodiment shown in FIG. 11 is a modification of the auxiliary antenna of FIG. In this auxiliary antenna 60, the area of the first loop 61 is made larger than the area of the first loop 41 of FIG. 6 so that the first loop 61 receives a large amount of high frequency magnetic field from the reader / writer. I have to. The first loop 61 is connected to the second loop 42 by a parallel connecting line 43. Therefore, the second loop 42
The amount of high-frequency magnetic field that the IC card receives from the IC card also increases, and the communicable area further expands. This principle is shown in FIGS.
It goes without saying that it can be applied to the 0 auxiliary antenna.

An auxiliary antenna 40d of the tenth embodiment shown in FIG. 12 is a modification of the auxiliary antenna of FIG. In the auxiliary antenna 40 of FIG. 6, the first loop 41 and the second loop 42 are connected by a parallel connecting line 43, but the auxiliary antenna 40d of FIG.
, They are connected by intersecting connecting lines 48. Therefore, if the first and second loops are folded at the folding curve 49 and the first and second loops are folded, the first and second loops are in a two-winding coil state, increasing the inductance. As a result, the auxiliary antenna 4
Depending on whether 0d is folded or not,
The inductance of the auxiliary antenna 40d can be switched, and the resonance frequency can be switched depending on the difference in the inductance. This auxiliary antenna 40
It goes without saying that the switches and capacitors shown in FIGS. 7 to 9 may be arranged in d.

Further, as shown in FIG. 13A, a constriction is provided between two loops, and as shown in FIG. You may make it a coil. Furthermore, FIG.
A constriction may be provided as shown in FIG. 3 (c), and the constriction may be twisted so as to be overlapped as shown in FIG. 13 (d).

[0024]

Since the auxiliary antenna of the present invention is constructed as described above, in the case of the auxiliary antenna whose function or non-function of the resonance circuit is switched by the switch, the IC card itself functions or does not function. When the switch is not provided and is integrated with the auxiliary antenna, it is not necessary to put it in and out of the shield case, and the communicable area can be selected by the switch of the auxiliary antenna. Further, in the case of the auxiliary antenna that switches the function or non-function depending on the patterns of the first and second substrates, it is the same as the conventional one when it is made to function as the auxiliary antenna, but it is
Since it has a shielding function, it is more suitable for the purpose. In the case of an auxiliary antenna that includes a loop antenna with two loops, if the connecting lines of the auxiliary antenna are parallel lines, folding the antenna at the center line can eliminate the antenna function of the loop antenna without a switch. The antenna function can be restored by opening the line. Further, by lengthening the connection line, it is possible to separate the position where the reader / writer functions from the position where the IC card functions. Further, when the connection lines intersect, the loop antenna becomes a double winding when folded, and can transmit stronger induced power.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of an auxiliary antenna of a data communication system of the present invention.

FIG. 2 is a diagram showing a second embodiment that is a modification of the first embodiment of FIG.

FIG. 3 is a diagram showing a third embodiment of the auxiliary antenna of the data communication system of the present invention.

FIG. 4 is a diagram illustrating a pattern of a second substrate of the auxiliary antenna of FIG.

5 is a diagram illustrating a case where the auxiliary antenna of FIG. 3 is disabled.

FIG. 6 is a diagram showing an auxiliary antenna according to a fourth embodiment of the present invention.

FIG. 7 is a diagram showing an auxiliary antenna according to a fifth embodiment of the present invention.

FIG. 8 is a diagram showing an auxiliary antenna according to a sixth embodiment of the present invention.

FIG. 9 is a diagram showing an auxiliary antenna according to a seventh embodiment of the present invention.

FIG. 10 is a diagram showing an auxiliary antenna according to an eighth embodiment of the present invention.

FIG. 11 is a diagram showing an auxiliary antenna according to a ninth embodiment of the present invention.

FIG. 12 is a diagram showing an auxiliary antenna according to a tenth embodiment of the present invention.

FIG. 13 is a view showing an auxiliary antenna according to eleventh and twelfth embodiments of the present invention.

FIG. 14 is a diagram showing a conventional example of a data communication system.

FIG. 15 is a diagram showing a conventional example of a data communication system using an auxiliary antenna.

16 is a diagram for explaining an auxiliary antenna used in the conventional example of FIG.

17 is a diagram for explaining an auxiliary antenna used in the conventional example of FIG.

FIG. 18 is a view for explaining an auxiliary antenna used in the conventional example of FIG.

[Explanation of symbols]

10, 20, 30, 40, 40a, 40b, 40c, 4
0d, 50, 60, 70 Auxiliary antenna 11 Loop antenna 12, 33, 47 Capacitor 13, 23, 45, 46 Switch 31 First substrate 32 Second substrate 41, 61 First loop 42 Second loop 43, 48,53 Connecting line 49 Folding curve

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) H01Q 3/24 G06K 19/00 H H04B 5/02 K F term (reference) 2C005 MA40 NA08 5B035 BB09 CA01 CA23 5J021 AA02 AA13 AB04 CA03 DA06 DB05 EA01 FA31 GA03 HA06 5J046 AA01 AA03 AB10 AB11 PA07 5K012 AA03 AB12 AC06 AE13 BA10

Claims (3)

[Claims]
1. Communication in which an IC card receives a high-frequency magnetic field from a reader / writer of a data communication system to generate an operating power supply, and the generated power supply allows the IC card to exchange signals with the reader / writer in a non-contact manner. A card-shaped auxiliary antenna arranged for the purpose of expanding the possible area, wherein a loop antenna, a capacitor forming a resonance circuit with the loop antenna, and the loop antenna function as an antenna, or An auxiliary antenna having a switch for switching it so as not to function.
2. A communicable area in which an IC card receives a high-frequency magnetic field from a reader / writer of a data communication system to generate a power supply for operation, and the generated power supply allows the IC card to exchange signals with the reader / writer. A card-shaped auxiliary antenna arranged for enlargement, comprising: a first substrate having a loop-shaped pattern and a spiral pattern formed inside the loop-shaped pattern; A second substrate assembled to the first substrate so that the patterned surface of the substrate is brought into contact with the patterned surface of the substrate so that the patterned substrate can slide between the first and second positions; A capacitor connected to the loop-shaped pattern of the first substrate to form a resonance circuit, and the pattern of the second substrate has a first position in the first position.
Of the first substrate, the loop-shaped pattern of the first substrate enables formation of a resonance circuit, and the spiral pattern has substantially the same shape, and in the second position, An auxiliary antenna, wherein the pitch of the loop-shaped pattern and the pitch of the spiral-shaped pattern of the first substrate is short-circuited by its own pattern to provide a shield function for stopping the formation of the resonance circuit.
3. A communication in which an IC card receives a high-frequency magnetic field from a reader / writer of a data communication system to generate an operating power supply, and the generated power supply allows the IC card to exchange signals with the reader / writer in a non-contact manner. A card-shaped auxiliary antenna arranged for expanding a feasible area, wherein a first loop arranged on one side of a center line and a second loop arranged on the opposite side of the first loop. And an auxiliary line connecting the first loop and the second loop across the center line to form one loop antenna as a whole.
JP2001257621A 2001-08-28 2001-08-28 Auxiliary antenna Withdrawn JP2003069335A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Publications (1)

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Family Applications (1)

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Country Status (1)

Country Link
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