JP2004274744A - Rf communication system of one-to-one correspondence method between each rf chip having single antenna and reader, and structure with rf id chip and antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an RF communication system of a one-to-one correspondence method between RF chips each having a single antenna and readers to realize RF communication of the readers in structures each comprising the RF chip and the antenna by means of one-to-one correspondence through remote antennas of multiple of readers or multiple sets of readers / writers, the system comprising a plurality of the readers or readers / writers connected to a plurality of the remote antennas and to provide the structures each comprising the RF chip and the antenna. <P>SOLUTION: The RF communication system is provided with: a containing section wherein the structures each comprising the RF chip and the single loop second antenna and including many RF chips and many antennas are arranged at least in a line so that the second antennas are adjacent to each other at a prescribed interval; many first antennas each respectively arranged to each second antenna so as to attain RF communication with each of the single second antennas when the structures comprising the RF chips and the antennas are arranged in the containing section; a paramagnetic material for minimizing communication interference between the first and second antennas, a signal level regulation circuit; a noise filter for eliminating noise from a power supply section; and a switching means for separately driving the first and second antennas. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a one-to-one correspondence RF communication system including a single antenna and an RF chip and a reader, and a structure of the RF chip and the antenna, and more particularly, to a plurality of RF antennas connected to each other. When separate RF communication between the component and a single reader is required, or when multiple RF antenna components need to be applied adjacent to each other in the area adjacent to each other. The system configuration method and form of

  In most applications, such as traffic cards and access control systems that require RF communications, cards or other forms of minimal components including readers and RF-type chips and antennas are used. In most cases, a component such as a card having an RF antenna and a reader device require one-to-one communication, and are generally applied in sections separated from each other.

  In the above case, the components having the reader unit and the RF antenna need to have the same resonance characteristics. At this time, if the resonance characteristics do not match, a result that is short of a desired communication distance may be obtained, or in extreme cases, mutual communication may not be possible. As the external factors affecting the resonance characteristics, in the example shown in FIG. 1, a magnetic structure around the reader 1 and the RF antenna 2 or a metal structure of the general reader 1, the RF communication module 3 Electromagnetic waves from (RFM) can be present and are affected by their strength and proximity conditions. Therefore, work for maximizing the resonance characteristics between the reader and the RF antenna and the arrangement of the reader 1 and the RF antenna 2 for avoiding the influence of the surrounding environment are required.

  When a plurality of RF antennas corresponding to the resonance characteristics and functions of a single reader are used at the same time, generally, the corresponding reader 1 performs its own work corresponding to a plurality of RF antennas and components 5. Cannot be performed simultaneously, and only one of the plurality of RF antenna components 5 is selected and performed. Work corresponding to one of the remaining constituents in the plurality of constituents is performed separately from the selected and operated constituents, and the same work is performed for all corresponding constituents. The process is performed.

  However, at this time, a plurality of components corresponding to a single reader machine have a limit on the number of chips and a reader device in the components when applied at the same time. Reproducibility is lost. That is, in some cases, three components can be connected to the reader at the same time, but other connections such as two appear on each test drawing for the same components. Problem.

  In addition, communication between a single reader (or read / write device) connected to multiple antennas and a structure composed of multiple RF chips and antennas corresponding one-to-one with multiple reader antennas In the case where the information input / output to each component and the division of the component itself are required, the communication method described above does not allow the individual division of the component itself. Measures are required, and multiple antennas are designed to be coherent with each other due to the designed shape and proximity of each antenna to a single reader, and the voltage and current characteristics transmitted from the reader. become. Unless these factors are considered, such coherence is unavoidable, and such coherence causes serious reliability problems in RF communication such as loss of communication data and irregular interruption of communication. Get up.

  For one-to-one communication between a plurality of remote antennas connected to a single reader or a read / write device (hereinafter abbreviated as a reader), and a component consisting of a corresponding RF chip and antenna It is necessary to remove the coherence between the remote antennas or each component and the coherence between the remote antenna and the RF antenna of other components other than the corresponding component. In order for a single reader to separate an object from its individual position and its own attributes, it is necessary to electrically separate the antenna from the remote reader corresponding to each component.

  SUMMARY OF THE INVENTION The present invention is directed to solving the above-described problems in view of the above-described requirements, and an RF corresponding to each remote antenna is provided through a plurality of remote antennas connected to a single reader or a read / write device. A one-to-one RFD with a single antenna and an RF chip with a single antenna that has an electrical and physical connection and arrangement for one-to-one communication between an RF chip composed of a chip and an antenna and an antenna component It is an object to provide a communication system and its RF chip and antenna components.

  Another object of the present invention is to form a plurality of readers or readers / writers connected to the plurality of remote antennas, and to control a plurality of sets of readers or readers / writers. An object of the present invention is to provide a one-to-one correspondence RF communication system of an RF chip having a single antenna and a reader unit for realizing RF communication between an RF chip and components of the antenna in one-to-one correspondence via an antenna.

  In order to achieve the above object, a one-to-one correspondence RF communication system including an RF chip having a single antenna and a reader according to an embodiment of the present invention includes an RF communication module and a plurality of RF chips and an antenna. A plurality of RF chips and antenna components each having a single loop-type second antenna and an RF chip are arranged in at least one row such that the respective second antennas are adjacent to each other at regular intervals. A receiving portion provided so as to face and correspond to each of the second antennas so that RF communication with each of the single second antennas is enabled when the components of the RF chip and the antenna are disposed in the receiving portion. A large number of loop-shaped first antennas, each of which is arranged as described above; communication interference between adjacent first and second antennas is minimized, and RF communication between each corresponding first and second antenna is enabled. What A paramagnetic body disposed at least below the antenna so as to minimize communication interference between an adjacent first antenna and a second antenna together with the paramagnetic body, and to correspond to each other first and second antennas A signal magnitude adjusting circuit for adjusting the magnitude of the output of the first antenna according to the characteristics of the system so that RF communication is possible between the RF antenna and a signal magnitude adjusting circuit; A noise filter for coupling to each of the first antennas and the second antenna, and a switching for electrically coupling between each of the first antennas and the RF communication module so that the respective first and second antennas can be separately driven. It is characterized by comprising means.

  The present invention also relates to an RF communication module having a first antenna and an RF chip having a second antenna for RF communication and an antenna component; wherein the second antenna has at least two components of an RF chip and an antenna component. Provided is an RF chip and antenna component comprising a single loop formed on a surface and connected to one RF chip, in which case the external configuration of the RF chip and antenna component is provided. When the case cover or a part of the case is opened or damaged, the connection between the RF chip and the second antenna is automatically cut when the connection between the RF chip and the second antenna is automatically broken. It is desirable to be attached to.

  According to the one-to-one correspondence RF communication system including the RF chip having the single antenna and the reader according to the embodiment of the present invention described above, and the configuration and application of the components of the RF chip and the antenna, the communication data is lost. Interference between remote antennas or components that cause problems such as communication or irregular interruption of communication, and interference between the remote antenna and the RF antenna of other components other than the corresponding component In addition, the reliability in RF communication can be ensured, and a plurality of readers or readers / writers connected to the plurality of remote antennas can be configured. It is possible to realize RF communication between the RF chip and the components of the antenna in a one-to-one correspondence through the remote antennas of many sets of readers or read / write units. In addition, since RF communication can be performed through any one of the two surfaces of the RF chip on which the loop antenna is formed and the antenna component 20, the handling of the RF chip and the antenna component 20 can be improved. There are effects such as being easy. According to the present invention, a single reader having a plurality of remote antennas and a plurality of remote antennas are provided according to the present invention in a situation where data transactions using RF communication are rapidly spreading due to demands for convenience and speed of use. By proposing a method that can ensure the reliability of communication in the communication between the RF chip and the antenna component, it is determined that various RF applications are possible, including the remote antenna and the like from the integrated aspect of the system Assuming that the reader unit, a plurality of RF chips, and an antenna component are one module, a method for realizing the reliability of RF communication in the coupling of each module and each module function is realistically proposed, It is expected that various applications will be integrated in the future.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  The present invention considers experimental interference factors in order to remove the above-mentioned interference, and presents a method for effectively suppressing the interference factors.

  The chip connected to the RF antenna for the experiment uses the Philips Mifare Standard having a resonance frequency of 13.56 MHz, and the RF of the single antenna reader unit is associated with the chip. As the communication module, a product using a Philips RC500 chip was used.

  An RF chip and antenna component 20 having an RF chip 21 and a second antenna 22a is manufactured in a shape as shown in FIG. 2, and the RF communication system 1 for the reader machine has the same configuration as the conventional RF communication module 3. And the first antenna 2 which is a remote antenna connected to it, is manufactured as shown in Fig. 1.As a result of connecting a single reader and a single remote antenna, an experiment shows that the RF chip and antenna It was confirmed that communication was performed over a communication distance of about 10 mm during RF communication with the component 20. Here, the second antenna 22a has a structure in which a single loop is formed on both surfaces 23 and 24 of the RF chip and antenna component 20 of the present invention as shown in FIG. For RF communication system only, it can be formed only on one side, and the antennas formed on both sides 23 and 24 may have different antenna performance from each other. Various configurations can be made according to the form of the product. As shown in FIG. 2, in the RF chip and antenna structure 20 of the present invention, the second antenna 22a is formed in a single loop on both sides 23 and 24, so that the RF chip and the antenna on which the loop antenna is formed are formed. Since the RF communication is performed by any one of the two surfaces of the component 20 of the above, the component 20 of the RF chip and the antenna is installed in the accommodation portion 16 in one of the two directions as shown in FIG. Becomes possible, and the handling becomes easy.

  However, it is similar to FIG. 3 so that it can communicate with a large number of RF chips and antenna components 20, but without the paramagnetic body 12 and the noise filter 14, that is, with a large number of remote antennas. .. 11n, only the switching means 13 and the RF communication module 15 are included in each of the first antennas 11a, 11b... 11n when they are separated from each other via the switching means 13. An RF communication system is configured so that RF communication is performed by being connected to the RF communication module 15, and a large number of corresponding RF chip and antenna components 20 are arranged in the housing 16 as shown by a two-dot chain line. As a result of experiments, it was confirmed that communication was not possible at a communication distance d of about 10 mm. Communication could not be performed over a shorter communication distance, and the overall communication error rate increased continuously as the number of times of execution increased. Confirm It was. Therefore, only by the configuration of the RF communication system via the switching means 13, only the RF chip 21 having the single second antennas 22a, 22b,... 22n and the multiple first antennas 11a, 11b,. It was found that each of the 11n could not perform RF communication in a one-to-one correspondence system.

  The above result is basically the interference between the first antennas 11a, 11b... 11n of the RF chip and antenna component 20 and the first antennas 11a, 11b. It is determined that such interference is caused by the strength of the voltage and current supplied to the remote antenna during RF communication, that is, as the output strength increases, and the first antennas 11a, 11b,. Or the second antennas 22a, 22b,..., 22n increase as the adjacent distance ('D' in FIG. 3) becomes shorter. Therefore, in order to reduce such coherence, it is necessary to lower the voltage and current and increase the distance between the antennas, but when the power supplied to the antenna is less than an appropriate value, the RF When the induced voltage becomes weak, the RF chip 21 may not operate, and the communication distance d may be shortened. Also, depending on the field of application, the distance between each first antenna 11a, 11b... 11n and / or the corresponding second antenna 22a, 22b. The first antennas 11a, 11b... 11n, which are remote antennas, which set an appropriate communication distance and enable communication using the minimum electric power, and the second antennas 22a, 22b which are RF antennas・ ・ Design and complement of 22n are required.

  To enable the RF chip driven by the voltage induced from the RF antenna with the minimum electric power from the remote antenna of the reader machine to operate, the area of the remote antenna, that is, the communication effective surface is reduced, and the antenna is reduced. After the number of turns is adjusted, a paramagnetic body 12 such as a ferrite is arranged at the lower end of the first antennas 11a, 11b,... 11n, which are remote antennas, as shown in FIGS. A signal magnitude adjusting circuit 18 capable of finely adjusting and setting the signal magnitude (output) is applied between the RF communication module 15 and the first antennas 11a, 11b,. As a result of conducting many experiments using the noise filter 14, the effect of extending the communication distance to low electric power, that is, the efficiency of communication with respect to power can be increased. This has led to the completion of the present invention Te.

  That is, as shown in FIG. 3 or FIG. 6, a plurality of first antennas 11a, 11b... 11n, which are a plurality of remote antennas connected to the RF communication module 15 of a single reader device or a read / write device, and The configuration shown in FIG. 3 to FIG. 5 is interposed between the multiple RF chips composed of the corresponding RF chip 21 and the second antennas 22a, 22b,. By doing so, it is possible to finally obtain desired communication reliability. That is, a plurality of first antennas 11a, 11b,..., 11n are driven by a single RF communication module 15, which is an RF communication reader (a single channel), so that each of the first antennas 11a, 11b,. ., And a plurality of RF chips and second antennas 22a, 22b,... 22n of the antenna component 20 corresponding to the respective first antennas 11a, 11b,. (Which can be a simple connection surface). Further, communication interference between adjacent first antennas 11a, 11b... 11n and second antennas 22a, 22b... 22n is minimized, and each corresponding first antenna 11a, 11b. , 22b... 22n, a paramagnetic body 12 is arranged at least below the antennas 11a, 11b. Further, the communication interference between the adjacent first antennas 11a, 11b... 11n and the second antennas 22a, 22b... 22n together with the paramagnetic body 12 is minimized, and the corresponding first antennas 11a, 11b. .. And the second antennas 22a, 22b... 22n so that RF communication is possible between the first antennas 11a, 11b. A circuit 18 is provided between the first antennas 11a, 11b... 11n and the RF communication module 15. Further, a noise filter 14 for removing noise from a power supply unit that normally provides a DC power supply from an AC power supply and connecting the power supply unit to the RF communication module 15 is provided. In FIG. 4, the RF communication module 15 and the switching unit 13 are configured separately, but in FIG. 5, there is a difference in that the configuration of the switching unit 13 and the like is configured by being combined with the RF communication module 15. Although a specific description is omitted, the means for controlling the switching means 13 can also be integrated as shown in FIG. 5 by changing or adding a controller for RF communication of the RF communication module 15, As shown in FIG. 4, the RF communication module 15 may be configured separately from the RF communication module 15.

  According to the present invention, the width W of the effective communication surface of each of the loop-type first antennas 11a, 11b... 11n and the second antennas 22a, 22b. , Length L within 20 mm and height within 80 mm, the distance D between adjacent first antennas 11a, 11b... 11n or adjacent second antennas 22a, 22b... 22n within 3 mm, and communication distance d within 10 mm Can be configured. That is, the above configuration minimizes interference and prevents a communication error from occurring, so that RF communication can be smoothly performed in a 1: 1 correspondence system.

  Further, a plurality of first antennas 11a, 11b,... 11n and RF communication modules 15 connected to the respective first antennas via the switching means 13 are configured in a plurality similarly to FIG. The arrangement of the RF chip and the antenna 20 is arranged and connected to the power supply unit 17 via the single noise filter 14, and as a result of trial of RF communication, between the modules, that is, between the multiple RF communication modules 15, It was confirmed that the error rate on the RF communication increased as the coherence of the signal further appeared. As a result, the cause was investigated and analyzed, and a variety of experiments were conducted by combining solutions to the cause. As a result, the following results were obtained.

  That is, the structure of FIG. 7 is a structure in which the power supplied to each module is shared and distributed, and when the modules operate simultaneously, the first antennas 11a, 11b,. It is investigated and analyzed that the voltage to 11n is not constant and contains a lot of noise, and as a countermeasure against this, the noise filter 14 is separated and connected to the power supply 17 applied to each RF communication module 15, and Problems that appear in the configuration of an RF communication system including a plurality of RF communication modules 15 by adjusting and setting the magnitude of each signal via each signal magnitude adjustment circuit 18 for each RF communication module 15 To improve communication reliability.

  In addition, the RF chip and the second antenna 22a, 22b,... 22n or the second antenna 22a, 22b,. It is desirable that the connection between the antennas 22a, 22b,... 22n be automatically cut. As an example, as shown in FIG. 8, when the second antennas 22a, 22b,... 22n and the RF chip 21 are installed in the case 26 via the internal installation member 25, and the case cover 27 is installed, After the internal installation member 25 is installed, a part of the case cover 27 is attached to the RF chip 21 and the second antennas 22a, 22b,. When the 27 is opened from the case 26, the second antennas 22a, 22b,.

  Further, as shown in FIG. 9, a single loop is formed on each of the plurality of surfaces 23 and 24 via a flat internal installation member 25, bent, and inserted into the case 26, so that the component 20 of the RF chip and the antenna is formed. It can be easily manufactured.

  The structure 20 of the RF chip and the antenna of the present invention and the structure 20 of the RF chip and the antenna for the RF communication system 10 may be variously changed or changed without being limited to the structure of FIG. 8 or 9. Also, in the configuration of the RF communication system 10, the first antennas 11a, 11b,... Changes or changes are possible.

FIG. 2 is a schematic block diagram of a reader having a single antenna and a plurality of RF chips and an antenna. FIG. 1 is a schematic perspective view illustrating one embodiment of a configuration of an RF chip and an antenna of the present invention. 1 is a schematic cross-sectional configuration diagram illustrating one embodiment of a main configuration of a one-to-one correspondence type RF communication system of an RF chip having a single antenna and a reader device of the present invention. FIG. 4 is a configuration diagram schematically illustrating a different example of only the main configuration of the RF communication system in FIG. 3 from each other. FIG. 4 is a configuration diagram schematically illustrating a different example of only the main configuration of the RF communication system in FIG. 3 from each other. FIG. 3 is an explanatory diagram illustrating an operation state of a one-to-one correspondence RF communication system using a single reader according to the present invention; FIG. 9 is a schematic diagram illustrating another embodiment of a plurality of readers according to the present invention, together with an operation state thereof. FIG. 3 is a schematic exploded perspective view showing a bent state of an antenna arranged on both surfaces of a component of the RF chip and the antenna in FIG. 2. FIG. 9 is a development view of FIG. 8.

Explanation of reference numerals

1, 10 RF communication system 2, 11a, 11b... 11n First antenna 12 Paramagnetic body 13 Switching means 14 Noise filter 3, 15 RF communication module (for reader or read / write machine)
DESCRIPTION OF SYMBOLS 16 Housing part 17 Power supply part 18 Signal size adjustment circuit 20 Components of RF chip and antenna 21 RF chip 22a, 22b,... 22n Second antenna 23, 24 Surface 25 Internal installation member 26 Case 27 Case cover

Claims (4)

In RF communication modules and RF communication systems between multiple RF chips and antenna components:
A plurality of RF chips and antenna components each having a single loop-type second antenna and RF chip are provided such that each of the second antennas is arranged in at least one row so as to be adjacent to each other at a fixed interval. Department;
When the components of the RF chip and the antenna are arranged in the housing portion, they are arranged to face and correspond to the respective second antennas so that RF communication with each single second antenna is enabled. Loop-type multiple first antennas;
Paramagnetic material disposed at least below the antennas so as to minimize communication interference between adjacent first and second antennas and enable RF communication between the corresponding first and second antennas ;
With the paramagnetic material, communication interference between adjacent first and second antennas is minimized, and the first and second antennas corresponding to each other can perform RF communication between the first and second antennas. A signal magnitude adjusting circuit for adjusting the magnitude of the output in one antenna;
A noise filter for removing noise from the power supply and connecting the power supply unit to the RF communication module; and the first antenna and the RF communication module so that the respective corresponding first and second antennas can be driven separately. Switch means for electrically connecting them to each other;
A one-to-one RF communication system with a single antenna and an RF chip and a reader.   The RF communication module, a plurality of first antennas, switching means, and a signal size adjusting circuit are configured in a number of sets, and the RF communication module is connected to a power supply unit through noise filters separated from each other. A one-to-one correspondence type RF communication system of an RF chip having a single antenna according to claim 1 and a reader device. An RF communication module having a first antenna and an RF chip having a second antenna for RF communication and an antenna arrangement;
The RF chip and the antenna structure, wherein the second antenna is configured as a single loop formed on at least two surfaces of the RF chip and the antenna structure and connected to one RF chip. The connection between the RF chip and the second antenna is automatically cut when the case cover or a part of the case constituting the outer shape of the component of the RF chip and the antenna is opened or damaged. The component of an RF chip and an antenna according to claim 3, wherein a part is attached to a case and / or a case cover.

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