JP2018097665A - Identifying body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly recognize identification information without reducing convenience even in a case of usage in contact with a dielectric body.SOLUTION: An identifying body includes a ground pattern 40 and antennas 21, 22 which are provided to respectively face the front and back sides of the ground pattern 40 via base substrates 10a, 10b and which exhibit a resonance peak as they face the ground pattern 40. The ground pattern 40 has a shape covering the antennas 21, 22 in a plan view.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an identification body capable of recognizing identification information using an antenna.

  In recent years, with the progress of the information society, information is recorded on labels and tags attached to products and the like, and products and the like are managed using the labels and tags. In information management using such a label or tag, a non-contact type IC label or non-contact type in which an IC chip capable of writing or reading information in a non-contact state is mounted on the label or tag. Discriminators using RFID technology such as type IC tags are rapidly spreading due to their excellent convenience.

The identification body using such RFID technology is not limited to the one on which the IC chip is mounted as described above, and has a plurality of antennas having different resonance peak frequencies, and a plurality of antennas without using the IC chip. A device that can recognize an ID by a combination of antennas is also considered. For example, the shape of the dielectric element and the capacitor element constituting the plurality of antennas may be different, or the shape and direction of the plurality of antennas may be different to change the resonance peak frequency for each of the plurality of antennas. Patent Documents 1 and 2 disclose techniques that allow IDs to be expressed in combination. If this technology is used, if the number of antennas is N, two information of “1” and “0” can be given depending on the presence / absence of one antenna, and there is no case where all antennas are not present. Thus, (2 ^N −1) IDs can be expressed in a recognizable manner.

Japanese Patent Publication No. 7-80386 Special table 2008-503759 gazette

  By the way, an identification body using the RFID technology as described above is often used in a state where it is in contact with a dielectric, for example, affixed to a product managed using the identification body. In that case, the frequency characteristics of the discriminator change due to the influence of the dielectric, and the resonance peak becomes gradual and cannot be detected, or the frequency of the resonance peak is greatly shifted. There is a risk of being unable to recognize.

  The present invention has been made in view of the problems of the conventional techniques as described above, and the identification information can be obtained without reducing the convenience even when used in contact with a dielectric. It is an object to provide an identifier that can be recognized correctly.

In order to achieve the above object, the present invention provides:
A conductive layer;
An antenna that is provided opposite to each of the front and back surfaces of the conductive layer via an insulating layer, and that exhibits a resonance peak by facing the conductive layer;
The conductive layer has a shape that covers the antenna in a plan view.

  In the present invention configured as described above, a resonance peak appears when the antenna faces the conductive layer, and the identification body is used in contact with a dielectric material such as affixed to a product. In addition, since the conductive layer is interposed between the antenna and the dielectric, it is avoided that the influence of the dielectric affects the frequency characteristics of the discriminator, thereby preventing the frequency characteristics of the discriminator from changing. Therefore, the identification information is recognized correctly. In that case, since the antenna is provided opposite to each of the front and back sides of the conductive layer via the insulating layer, the identification information can be recognized from any surface of the identification body.

  As for the antenna as described above, when the Q value in a state of not facing the conductive layer is 30 or less, a sharp resonance peak with a Q value of 30 or more can be exhibited by facing the conductive layer.

  In addition, if the antennas provided opposite to the front and back of the conductive layer via the insulating layer have different resonance peak frequencies that are manifested by facing the conductive layer, the front and back of the identifier are determined. Or two pieces of identification information can be represented depending on the method of use.

  In addition, in the case where the antenna has a plurality of regions provided to face the conductive layer through the insulating layer, the resonance peak frequency that appears when the antenna faces the conductive layer is different for each of the plurality of regions, Each of the plurality of regions is one of a region where the antenna is provided and a region where the antenna is not provided, and in the region where the antenna is provided, by facing the conductive layer of the antenna In the region where the expressed resonance peak is detected and the antenna is not provided, the resonance peak is not detected and is not detected, and identification information including a combination of these binary information can be expressed.

  According to the present invention, when the antenna is opposed to the conductive layer, a resonance peak appears, and when the identifier is used in contact with a dielectric material such as affixed to a product or the like, the antenna and the dielectric material are used. By interposing the conductive layer between them, the frequency characteristics of the discriminator are prevented from changing due to the influence of the dielectric, and the discriminating information can be correctly recognized by detecting the resonance peak. At that time, since the antenna is provided opposite to each of the front and back of the conductive layer through the insulating layer, the identification information can be recognized from any surface of the identification body and is in contact with the dielectric Even if it is a case where it is used, identification information can be correctly recognized without deteriorating convenience.

  In addition, when the antennas provided opposite to each of the front and back sides of the conductive layer through the insulating layer have different resonance peak frequencies that are manifested by facing the conductive layer, the front and back sides of the identifier are determined. Or two pieces of identification information can be represented depending on the method of use.

  Further, in the case where the antenna has a plurality of regions provided to face the conductive layer through the insulating layer, the frequency of the resonance peak that appears when the antenna faces the conductive layer is different for each of the plurality of regions. Since each of the regions is either one of the region where the antenna is provided and the region where the antenna is not provided, binary information based on the region where the resonance peak is detected and the region where the resonance peak is not detected It is possible to express identification information consisting of a combination of

It is a figure which shows an example of the basic form of the identification body of this invention, (a) is a figure which shows the structure of the surface, (b) is AA 'sectional drawing shown to (a), (c) is a back surface. It is a figure which shows a structure. It is a figure for demonstrating the frequency characteristic of the ID tag in which an antenna is formed only in one side of one base substrate, and (a) shows the frequency characteristic in the state where the ID tag is not in contact with the dielectric. FIG. 5B is a diagram showing frequency characteristics in a state where the ID tag is in contact with the dielectric. It is a figure for demonstrating the frequency characteristic of the ID tag by which an antenna is formed only in one surface of one base base material, and a ground pattern is formed in the whole surface of the other surface, (a) The figure which shows the frequency characteristic at the time of reading ID from the formed surface side, (b) is a figure which shows the frequency characteristic at the time of reading ID from the surface side in which the ground pattern was formed. It is a figure for demonstrating the frequency characteristic of the ID tag shown in FIG. 1, (a) is a figure which shows the frequency characteristic in the state where an ID tag is not in contact with a dielectric material, (b) is ID from one surface side. It is a figure which shows the frequency characteristic at the time of reading. It is a figure for demonstrating the characteristic of the antenna facing a ground pattern, (a) is a figure which shows the characteristic of the antenna which a resonance peak does not express when it faces a ground pattern, (b) is facing a ground pattern. It is a figure which shows the characteristic of the antenna which a resonance peak expresses by doing. It is a figure which shows the application example of the ID tag shown in FIG. 1, (a) is a figure which shows the structure of the surface, (b) is AA 'sectional drawing shown to (a), (c) is a back surface figure. It is a figure which shows a structure. It is a figure which shows an example of the ID recognition system which recognizes ID provided to the ID tag shown in FIG. It is a figure which shows the other example of the basic form of the identification body of this invention, (a) is a figure which shows the structure of the surface, (b) is AA 'sectional drawing shown to (a), (c) is It is a figure which shows the structure of a back surface. It is a figure for demonstrating the frequency characteristic of the ID tag shown in FIG. It is a figure which shows the practical example of the ID tag shown in FIG. 1, (a) is a surface figure, (b) is A-A 'sectional drawing shown to (a). It is a figure which shows the modification practical example of the ID tag shown in FIG. 1, (a) is a surface figure, (b) is A-A 'sectional drawing shown to (a).

  Embodiments of the present invention will be described below with reference to the drawings.

  1A and 1B are diagrams showing an example of a basic form of an identifier of the present invention, where FIG. 1A is a diagram showing a surface configuration, FIG. 1B is a cross-sectional view along AA ′ shown in FIG. ) Is a diagram showing the configuration of the back surface.

  As shown in FIG. 1, the identification body in the present embodiment is configured by laminating a base substrate 10 a provided with an antenna region 31 and a base substrate 10 b provided with an antenna region 32 via a ground pattern 40. ID tag 1.

  Each of the base substrates 10a and 10b serves as an insulating layer in the present invention, and is made of an insulating material having the same shape and a thickness of about 200 to 300 μm. A resin film or the like can be considered as the insulating material, but a material having a small dielectric loss tangent is preferable. The insulating layer may be configured by applying an insulating resin film without using the base substrates 10a and 10b. The antenna regions 31 and 32 are provided on the surface opposite to the surface of the base base material 10a or 10b on which the ground pattern 40 is laminated, and the antennas 21 and 22 made of a conductive material are formed. Thus, the antennas 21 and 22 are provided so as to face each other on the front and back of the ground pattern 40 via the base substrates 10a and 10b. Each of the antennas 21 and 22 has a rectangular outer shape, and has a shape in which a slit enters the longitudinal direction from one of its short sides. The antenna regions 31 and 22 have the same shape and the same direction. 32. Then, the antennas 21 and 22 are opposed to the ground pattern 40, thereby expressing a resonance peak at a frequency corresponding to the shape of the antennas 21 and 22.

  The ground pattern 40 serves as a conductive layer in the present invention, and is formed on the entire surface of at least one of the laminated surfaces of the base substrate 10a and the base substrate 10b between the base substrates 10a and 10b. Thus, the antennas 21 and 22 are covered in a plan view.

  In the ID tag 1 configured as described above, the antennas 21 and 22 are opposed to the ground pattern 40 so that a resonance peak appears at a frequency corresponding to the shape of the antennas 21 and 22. In the reflected wave, the ID assigned to the ID tag 1 can be recognized depending on whether a resonance peak is detected in the vicinity of the frequency corresponding to the shape of the antennas 21 and 22. Specifically, if the antennas 21 and 22 are formed in the antenna areas 31 and 32, respectively, a resonance peak is detected. Therefore, the ID at that time is set to “1”, and any of the antenna areas 31 and 32 is set. Since the resonance peak is not detected if the antennas 21 and 22 are not formed, the ID can be recognized by setting the ID at that time to “0”. A detailed description of the fact that the antennas 21 and 22 exhibit a resonance peak by facing the ground pattern 40 will be described later.

  Here, the operation of the antennas 21 and 22 that are provided so as to be opposed to the front and back surfaces of the ground pattern 40 via the base substrates 10a and 10b will be described.

  First, frequency characteristics of an ID tag in which an antenna similar to that shown in FIG. 1 is formed on only one surface of one base substrate will be described.

  FIG. 2 is a diagram for explaining the frequency characteristics of an ID tag in which an antenna is formed on only one surface of a single base substrate. FIG. 2A shows a state where the ID tag is not in contact with a dielectric. The figure which shows the frequency characteristic of (b) is a figure which shows the frequency characteristic of the state in which the ID tag is in contact with the dielectric.

  In an ID tag in which an antenna is formed only on one surface of a single base substrate, an electromagnetic wave is irradiated from the surface side where the antenna is formed in a state where it is not in contact with a dielectric, and the reflected wave is received. If the frequency characteristic of the reflected wave is as shown by the solid line in FIG. 2A, the reflected wave is received by irradiating the electromagnetic wave from the side opposite to the surface on which the antenna is formed. Even so, the frequency characteristic of the reflected wave is as shown by the broken line in FIG. 2 (a), and the frequency characteristic hardly changes, and the ID due to the resonance peak of the antenna is correctly recognized from any surface of the ID tag. can do.

  However, in an ID tag in which an antenna is formed only on one surface of one base substrate, the frequency characteristics of reflected waves in a state where the antenna is not in contact with the dielectric are as shown by a solid line in FIG. Even if it is a thing, if it irradiates electromagnetic waves in the state which contacted dielectrics, such as a human hand, and receives the reflected wave, the frequency characteristic of a reflected wave will become as shown by the broken line of Drawing 2 (b), The frequency characteristic changes greatly under the influence of the surrounding environment, and the ID due to the resonance peak of the antenna cannot be correctly recognized.

  Next, an antenna similar to that shown in FIG. 1 is formed on only one surface of one base substrate, and a ground pattern is formed on the entire other surface in the same manner as shown in FIG. The frequency characteristics of the ID tag will be described.

  FIG. 3 is a diagram for explaining the frequency characteristics of an ID tag in which an antenna is formed only on one surface of one base substrate and a ground pattern is formed on the entire other surface. ) Is a diagram showing frequency characteristics when ID is read from the surface side where the antenna is formed, and (b) is a diagram showing frequency characteristics when ID is read from the surface side where the ground pattern is formed. It is.

  In an ID tag in which an antenna is formed only on one surface of one base substrate and a ground pattern is formed on the entire other surface, the surface on which the antenna is formed without being in contact with a dielectric. When the electromagnetic wave is irradiated from the side and the reflected wave is received, if the frequency characteristic of the reflected wave is as shown by the solid line in FIG. 3A, it is in contact with a dielectric such as a human hand Even when the reflected wave is received by irradiating the electromagnetic wave from the surface side where the antenna is formed, the frequency characteristic of the reflected wave is as shown by the broken line in FIG. Almost unchanged, the ID due to the resonance peak of the antenna can be correctly recognized regardless of whether it is in contact with the dielectric.

  However, in an ID tag in which an antenna is formed only on one surface of a single base substrate and a ground pattern is formed on the entire surface of the other surface, electromagnetic waves are irradiated from the surface on which the antenna is formed. When the reflected wave is received, even if the frequency characteristic of the reflected wave is as shown by the solid line in FIG. 3B, the reflected wave is received by irradiating the electromagnetic wave from the surface side on which the ground pattern is formed. Then, the electromagnetic wave is cut off by the ground pattern, and the frequency characteristic of the reflected wave becomes as shown by the broken line in FIG. 3B, the resonance peak does not exist in the frequency characteristic, and the ID due to the resonance peak of the antenna is recognized. It becomes impossible to do.

  Next, the frequency characteristics of the ID tag 1 shown in FIG. 1 will be described.

  FIG. 4 is a diagram for explaining the frequency characteristics of the ID tag 1 shown in FIG. 1. FIG. 4A is a diagram showing the frequency characteristics when the ID tag 1 is not in contact with the dielectric, and FIG. It is a figure which shows the frequency characteristic at the time of reading ID from the one surface side.

  In the ID tag 1 shown in FIG. 1, when the electromagnetic wave is irradiated from the surface side on which the antenna 21 is formed and the reflected wave is received without contacting the dielectric, the frequency characteristic of the reflected wave is as shown in FIG. It becomes as shown by the solid line in (a), and has a resonance peak in the region surrounded by the dotted line in the figure.

  On the other hand, in the ID tag 1 shown in FIG. 1, when the electromagnetic wave is irradiated from the surface side where the antenna 22 is formed and the reflected wave is received without being in contact with the dielectric, the frequency characteristic of the reflected wave is As shown by the broken line in FIG. 4A, the frequency characteristics hardly change, and similarly, a resonance peak is present in the region surrounded by the dotted line in the figure.

  As described above, in the ID tag 1 shown in FIG. 1, even when the electromagnetic wave is irradiated from the surface side on which the antenna 21 is formed and the reflected wave is received without being in contact with the dielectric, the antenna 22 is also received. Even when an electromagnetic wave is applied from the surface side where is formed and the reflected wave is received, the frequency characteristics hardly change, and a resonance peak appears at the same frequency. As described above, when the antennas 21 and 22 have the same shape and are formed on the base substrates 10a and 10b in the same direction, respectively, and when electromagnetic waves are irradiated from one surface, This is because the electromagnetic wave is blocked by the ground pattern 40 and the reflected wave is received without being influenced by the antenna on the other surface.

  Further, in the ID tag 1 shown in FIG. 1, when the electromagnetic wave is irradiated from the surface side where the antenna 21 is formed and the reflected wave is received without being in contact with the dielectric, the frequency characteristic of the reflected wave is In the case shown by the solid line in FIG. 4B, an electromagnetic wave is irradiated from the surface side on which the antenna 21 is formed in contact with a dielectric such as a human hand, and the reflected wave is received. Even in this case, the frequency characteristic of the reflected wave is as shown by the broken line in FIG. 4B, the frequency characteristic is hardly changed, and has a resonance peak in the region surrounded by the dotted line in the figure. The ID due to the resonance peak of the antenna can be recognized regardless of whether it is in contact with the antenna. This is the same even when an electromagnetic wave is irradiated from the surface side where the antenna 22 is formed and the reflected wave is received.

  As described above, the ID tag 1 shown in FIG. 1 irradiates the electromagnetic wave in contact with the dielectric even when the electromagnetic wave is irradiated and the reflected wave is received without contacting the dielectric. When the reflected wave is received, the frequency characteristics hardly change, and a resonance peak appears at the same frequency. As described above, when the antennas 21 and 22 face the ground pattern 40, a resonance peak appears at a frequency corresponding to the shape of the antennas 21 and 22, and the dielectric 21 is in contact with the dielectric. This is because the influence of the dielectric is blocked by the ground pattern 40 even in this case.

  As described above, in the ID tag 1 shown in FIG. 1, the antennas 21 and 22 are provided to face the front and back of the ground pattern 40 via the base substrates 10a and 10b, respectively. When the electromagnetic wave is irradiated from the surface side where the antenna 21 is formed and the reflected wave is received, or when the electromagnetic wave is irradiated from the surface side where the antenna 22 is formed and the reflected wave is received, The frequency characteristics hardly change, a resonance peak appears at the same frequency, and when the reflected wave is received by irradiating the electromagnetic wave without contacting the dielectric, When the reflected wave is received by irradiating electromagnetic waves while in contact, the frequency characteristics hardly change, and a resonance peak appears at the same frequency. The resonance peaks of the tenors 21 and 22 are correctly detected, and the identification information by the resonance peaks is correctly recognized without deteriorating convenience even when the ID tag 1 is used in contact with the dielectric. Can do.

  Here, it will be described that the antennas 21 and 22 develop a resonance peak by facing the ground pattern 40.

  5A and 5B are diagrams for explaining the characteristics of the antenna facing the ground pattern. FIG. 5A is a diagram showing the characteristics of the antenna in which the resonance peak does not appear when facing the ground pattern. FIG. It is a figure which shows the characteristic of the antenna which a resonance peak expresses by facing a ground pattern.

  As shown by a solid line in FIG. 5A, an antenna having a sharp resonance peak with a Q value exceeding 30 is shown by a broken line in FIG. 5A when facing the ground pattern as shown in FIG. Thus, the resonance peak does not appear.

  On the other hand, as shown by the solid line in FIG. 5B, in an antenna having a gentle resonance peak with a Q value of 20, when facing the ground pattern as shown in FIG. 1, the antenna shown in FIG. As indicated by the broken line, a sharp resonance peak having a Q value of 30 or more appears at different frequencies. Thus, in order for the resonance peak to appear when facing the ground pattern, it is necessary that the Q value is 30 or less, preferably 20 or less, or that the antenna alone does not exhibit the resonance peak. .

The Q value is the frequency at the resonance peak at ω ₀ , the frequency at which the vibration energy is half the resonance peak at the lower frequency side than the resonance peak is ω _1, and at the higher frequency side from the resonance peak. When the frequency at which the vibration energy is half the resonance peak is ω ₂ , this is a value represented by Q = ω ₀ / (ω ₂ −ω ₁ ).

  Therefore, in the antennas 21 and 22 shown in FIG. 1, the Q value in the state where the antennas 21 and 22 are not opposed to the ground pattern 40 is 30 or less. A sharp resonance peak having a value of 30 or more appears.

  Hereinafter, an application example in which an ID is actually generated using the above-described action and the ID is recognized will be described.

  6A and 6B are diagrams showing an application example of the ID tag 1 shown in FIG. 1, wherein FIG. 6A is a diagram showing the configuration of the surface, FIG. 6B is a cross-sectional view taken along line AA ′ shown in FIG. c) is a diagram showing the configuration of the back surface.

  In this application example, as shown in FIG. 6, the base substrate 110 a provided with five antenna regions 131 a to 131 e and the base substrate 110 b provided with five antenna regions 132 a to 132 e form the ground pattern 140. The ID tag 101 is configured to be stacked via the ID tag 101.

  Each of the base substrates 110a and 110b is made of, for example, the same material as the base substrates 10a and 10b shown in FIG. The antenna regions 131a to 131e and the antenna regions 132a to 132e are provided so as to face each other on the surface opposite to the laminated surface of the base substrates 110a and 110b with the ground pattern 140, respectively.

  Different frequencies are allocated to the antenna regions 131a to 131e and 132a to 132e. In this embodiment, a frequency of 7.0 GHz is assigned to the antenna areas 131a and 132a, a frequency of 8.0 GHz is assigned to the antenna areas 131b and 132b, and the antenna areas 131c and 132c are assigned to the antenna areas 131c and 132c. A frequency of 9.0 GHz is assigned, a frequency of 10.0 GHz is assigned to the antenna regions 131d and 132d, and a frequency of 11.0 GHz is assigned to the antenna regions 131e and 132e.

  The ground pattern 140 is formed on the entire surface of at least one of the laminated surfaces of the base substrate 110a and the base substrate 110b between the base substrates 110a and 110b.

  The antenna regions 131a and 132a are formed with antennas 121a and 122a, respectively, which are opposed to the ground pattern 140 and exhibit resonance peaks in the vicinity of 7.0 GHz assigned to the antenna regions 131a and 132a. The antenna regions 131b and 132b are formed with antennas 121b and 122b, respectively, which are opposed to the ground pattern 140 and exhibit resonance peaks in the vicinity of 8.0 GHz allocated to the antenna regions 131b and 132b. The antenna regions 131c and 132c are formed with antennas 121c and 122c, respectively, which are opposed to the ground pattern 140 and exhibit a resonance peak in the vicinity of 9.0 GHz allocated to the antenna regions 131c and 132c. Antennas are not formed in the antenna regions 131d and 132d. The antenna regions 131e and 132e are formed with antennas 121e and 122e, respectively, which are opposed to the ground pattern 140 and exhibit a resonance peak in the vicinity of 11.0 GHz assigned to the antenna regions 131e and 132e. The antennas formed in these antenna regions 131a to 131e and 132a to 132e have a rectangular outer shape similar to that shown in FIG. 1, and have a shape in which a slit enters the longitudinal direction from one of its short sides. However, since the lengths in the longitudinal direction are different, resonance peaks appear at different frequencies by facing the ground pattern. Of the antenna regions 131a to 131e and 132a to 132e, the antennas formed in the antenna regions 131a, 131b, 131d, 131e, 132a, 132b, 132d, and 132e have the same longitudinal direction. Thus, the antennas formed in the antenna regions 131c and 132c have a longitudinal direction orthogonal to them and serve as a reference antenna. Thus, the antennas formed in the antenna regions 131a, 131b, 131d, 131e, 132a, 132b, 132d, and 132e and the antennas formed in the antenna regions 131c and 132c are polarized by having their longitudinal directions orthogonal to each other. The directions are different from each other.

  FIG. 7 is a diagram illustrating an example of an ID recognition system that recognizes an ID assigned to the ID tag 101 illustrated in FIG. 6.

  As shown in FIG. 7, the ID recognition system in this example includes the ID tag 101 shown in FIG. 6 and a reader 50 that recognizes the ID assigned to the ID tag 101. The reader 50 includes a transmission antenna 51a. A reception antenna 51b, a transmission unit 52, a reception unit 53, a processing unit 54, and a control unit 55.

  The transmission unit 52 generates electromagnetic waves including frequencies assigned to the antenna regions 131a to 131e and 132a to 132e, and irradiates them through the transmission antenna 51a.

  The receiving unit 53 receives the reflected wave from the ID tag 101 with respect to the electromagnetic wave irradiated from the transmitting unit 52 via the transmitting antenna 51a via the receiving antenna 51b, and detects the level of the received power of the reflected wave.

  The processing unit 54 detects a resonance peak in the ID tag 101 based on the level of received power detected by the receiving unit 53, and detects a resonance peak among the frequencies assigned to the antenna regions 131a to 131e and 132a to 132e. The individual ID for the generated frequency is set to “1”, the individual ID for the frequency for which the resonance peak is not detected is set to “0”, and these “1” and “0” are arranged in the order of the frequencies, thereby obtaining the ID. The ID assigned to the tag 101 is recognized. At this time, the antennas 121c and 122c formed in the antenna regions 131c and 132c are polarized with respect to the antennas formed in the antenna regions 131a, 131b, 131d, 131e, 132a, 132b, 132d, and 132e, as described above. Since the directions are different, the antennas 121c and 122c are used as reference antennas.

  The control unit 55 controls the irradiation of electromagnetic waves in the transmission unit 52 and each process in the processing unit 54.

  In the case of recognizing the ID given to the ID tag 101 using the reader 50 configured as described above, in the transmission unit 52, 7.0 GHz to 11 assigned to the antenna regions 131a to 131e and 132a to 132e. The electromagnetic wave of the said frequency band is irradiated to the ID tag 101 via the transmission antenna 51a, sweeping the frequency band containing 0.0 GHz.

  Then, the reflected wave from the ID tag 101 is received by the receiving unit 53 via the receiving antenna 51b, and the level of the received power of the reflected wave is detected. In the processing unit 54, the reception detected by the receiving unit 53 is detected. A resonance peak is detected depending on the power level. In the ID tag 101 shown in FIG. 6, as described above, the antennas 121a and 122a having a resonance peak in the vicinity of 7.0 GHz are formed in the antenna regions 131a and 132a, and the antenna regions 131b and 132b have 8 Antennas 121b and 122b having a resonance peak in the vicinity of 0.0 GHz are formed, and antennas 121c and 122c having a resonance peak in the vicinity of 9.0 GHz are formed in the antenna regions 131c and 132c. Since the antennas 121e and 122e having a resonance peak in the vicinity of 11.0 GHz are formed, the received power of the reflected wave received by the receiving unit 53 is 7.0 GHz, 8.0 GHz, 9.0 GHz, and Each has a resonance peak at 11.0 GHz.

  Since the frequencies assigned to the antenna regions 131a to 131e and 132a to 132e are equally spaced by 1 GHz, the processing unit 54 assigns individual IDs for frequencies at which resonance peaks are detected at 1 GHz intervals. The ID is set to “1”, the individual ID for the frequency for which the resonance peak is not detected is set to “0”, and “1” and “0” that are the binary information are arranged in the order of, for example, the lowest frequency, thereby the ID tag. The ID assigned to 101 is recognized. In the ID tag 101 shown in FIG. 6, as described above, resonance peaks are detected at 7.0 GHz, 8.0 GHz, 9.0 GHz, and 11.0 GHz. An ID “11101” in which “1”, “1”, “0”, “1” are arranged in this order is recognized. At this time, the 9.0 GHz resonance peak is due to the reference antennas 121c and 122c having a polarization direction different from that of the other antennas, so that it can be distinguished from the other resonance peaks. Therefore, by forming the antennas 121c and 122c in the antenna regions 131c and 132c without fail, the individual IDs are arranged so that the individual ID “1” due to the resonance peak of the antennas 121c and 122c is in the center. When the antennas 121a and 122a and the antennas 121e and 122e are not formed in the antenna regions 131a and 132a to which the frequency is assigned and the antenna regions 131e and 132e to which the highest frequency is assigned, or the processing unit 54 detects Even when the resonance peak is slightly shifted, the ID assigned to the ID tag 101 can be accurately recognized. In order to distinguish the resonance peaks of the reference antennas 121c and 122c from those of the other antennas, the polarization direction is different if the waveform of the reflected wave is different from the reflected wave from the other antenna. Not limited to

  In the ID tag 101 shown in FIG. 6, the ground pattern 140 is laminated on at least one of the laminated surfaces of the base substrate 110a and the base substrate 110b between the base substrates 110a and 110b. However, the antenna region is opposed to the antenna regions 131a to 131e and 132a to 132e on at least one of the laminated surfaces of the base substrate 110a and the base substrate 110b between the base substrates 110a and 110b. The ground pattern 140 may be laminated so as to cover 131a to 131e and 132a to 132e, respectively. In this case, the ground pattern may be one that does not cover a very small area of the antenna that is opposed to each other in plan view, and is defined as having a shape that covers the antenna in plan view.

  In the example shown in FIG. 6, frequencies are assigned to the antenna regions 131a to 131e and 132a to 132e, and the ground patterns 140 and the antenna regions 131a to 131c, 131e, 132a to 132c, and 132e. By facing each other, antennas 121a to 121c, 121e, 122a to 122c, and 122e in which resonance peaks appear in the vicinity of the frequencies assigned to the antenna regions 131a to 131c, 131e, 132a to 132c, and 132e are formed. If the frequency range for detecting the resonance peak and the interval between the resonance peaks of the antennas formed in the antenna regions 131a to 131e and 132a to 132e are determined, the frequency is set to each of the antenna regions 131a to 131e and 132a to 132e. Is Even if not devoted, by arranging the individual ID determined by whether the resonance peak is detected, it is possible to recognize the ID assigned to the ID tag.

  8A and 8B are diagrams showing another example of the basic form of the identifier of the present invention, in which FIG. 8A is a diagram showing the configuration of the surface, and FIG. 8B is a cross-sectional view taken along line AA ′ shown in FIG. (C) is a figure which shows the structure of a back surface.

  As shown in FIG. 8, the identification body in this embodiment is an ID tag 201 in which the size of the antenna 222 formed in the antenna region 32 of the base substrate 10b is different from that of the ID tag 1 shown in FIG.

  In the ID tag 201 of the present embodiment, the antenna 21 formed in the antenna region 31 of the base substrate 10a and the antenna 222 formed in the antenna region 32 of the base substrate 10b have a length in the longitudinal direction of each other. Thus, the frequencies of the resonance peaks that appear when facing the ground pattern 40 are different from each other.

  FIG. 9 is a diagram for explaining the frequency characteristics of the ID tag 201 shown in FIG.

  In the ID tag 201 shown in FIG. 8, when electromagnetic waves are irradiated from the surface side on which the antenna 21 is formed and the reflected waves are received, the frequency characteristics of the reflected waves are as shown by the solid line in FIG. According to the shape of 21, there is a resonance peak in the vicinity of 8.3 GHz. On the other hand, when an electromagnetic wave is irradiated from the surface side where the antenna 222 is formed and the reflected wave is received, the frequency characteristic of the reflected wave is different from the shape of the antenna 21 in FIG. As indicated by the broken line, a resonance peak is present in the vicinity of 7.7 GHz according to the shape of the antenna 222. This is because when the electromagnetic wave is irradiated from the surface side on which the antenna 21 is formed and the reflected wave is received, the electromagnetic wave does not penetrate the antenna 222 side by the ground pattern 40, and the antenna 222 is not affected by the antenna 222. When the resonance peak due to only the frequency characteristic of the antenna 21 appears, and when the reflected wave is received by irradiating the electromagnetic wave from the surface side where the antenna 222 is formed, the electromagnetic wave penetrates the antenna 21 side by the ground pattern 40. This is because a resonance peak due to only the frequency characteristic of the antenna 222 appears without being affected by the antenna 21.

  Thus, in the ID tag 201 in this embodiment, the antennas 21 and 222 provided to face the front and back of the ground pattern 40 via the base substrates 10a and 10b are manifested by facing the ground pattern 40. Since the resonance peak frequencies are different from each other, the front and back of the ID tag 201 can be determined. Also, two IDs, an ID corresponding to the resonance peak due to the antenna 21 and an ID corresponding to the resonance peak due to the antenna 222, can be expressed according to the usage method of the ID tag 201.

  10A and 10B are diagrams showing a practical example of the ID tag 1 shown in FIG. 1, wherein FIG. 10A is a front view and FIG. 10B is a cross-sectional view taken along line A-A ′ shown in FIG.

  The ID tag 1 shown in FIG. 1 can be used as a chipless card 60 by being sandwiched from the front and back by two surface base materials 61a and 61b made of an insulating material such as a resin as shown in FIG. it can. In that case, as shown in FIG. 10, the surface base material 61a is laminated on the surface of the base base material 10a on which the antenna 21 is formed, and the base base material 10a and the surface base material 61a are adhered by the adhesive layer 70a. The surface base 61b is laminated on the surface of the base base 10b on which the antenna 22 is formed, and the base base 10b and the surface base 61b are adhered by the adhesive layer 70b to form the chipless card 60. Conceivable. The base substrates 10a and 10b and the surface substrates 61a and 61b may be bonded by means such as fusion without depending on the adhesive layers 70a and 70b.

  Also in the chipless card 60 configured as described above, since the ID tag 1 shown in FIG. 1 is built in, any surface side of the front and back sides even in a state of contact with a dielectric such as a human hand. Even if an electromagnetic wave is irradiated from the antenna and the reflected wave is received, the resonance peak by the antennas 21 and 22 can be detected, and the ID can be correctly recognized.

  11A and 11B are diagrams showing a modified practical example of the ID tag 1 shown in FIG. 1, wherein FIG. 11A is a front view and FIG. 11B is a cross-sectional view taken along line A-A ′ shown in FIG.

  In this practical example, as shown in FIG. 11, a conductive case 140 is housed in a thin case-shaped frame member 161 made of an insulating material such as a resin instead of the ground pattern 40 shown in FIG. The chipless card 160 is provided with antennas 21 and 22 facing the conductive plate 140.

  The conductive plate 140 is disposed at an intermediate point between the top surface and the bottom surface of the frame member 161, the antenna 21 is disposed on the inner surface of the top surface of the frame member 161, and the antenna 22 is disposed on the bottom surface of the frame member 161. Each is formed on the inner surface. As a result, spaces 110 a and 110 b serving as insulating layers are formed between the antennas 21 and 22 and the conductive plate 140, respectively.

  Also in the chipless card 160 configured as described above, the antennas 21 and 22 that exhibit resonance peaks when facing the conductive plate 140 are connected to the front and back surfaces of the conductive plate 140 via the spaces 110a and 110b serving as insulating layers. Even if the conductive plate 140 has a shape that covers the antennas 21 and 22 in a plan view, both surfaces of the front and back sides are provided, facing each other. Even if an electromagnetic wave is irradiated from the side and the reflected wave is received, the resonance peak by the antennas 21 and 22 can be detected, and the ID can be recognized correctly.

1, 101, 201 ID tag 10a, 10b, 110a, 110b Base material 21, 22, 121a-121c, 121e, 122a-122c, 122e, 222 Antenna 131a-131e, 132a-132e Antenna area 40, 140 Ground pattern 50 Reader 51a Transmission antenna 51b Reception antenna 52 Transmission unit 53 Reception unit 54 Processing unit 55 Control unit 60, 160 Chipless card 61a, 61b Surface base material 70a, 70b Adhesive layer 110a, 110b Space 140 Conductive plate 161 Frame member

Claims (4)

A conductive layer;
An antenna that is provided opposite to each of the front and back surfaces of the conductive layer via an insulating layer, and that exhibits a resonance peak by facing the conductive layer;
The conductive layer is an identification body having a shape that covers the antenna in a plan view. The identification object according to claim 1,
The antenna is an identification body having a Q value of 30 or less when not facing the conductive layer. In the identification object according to claim 1 or 2,
The antenna provided opposite to each of the front and back sides of the conductive layer with the insulating layer interposed therebetween is a discriminator in which the frequencies of resonance peaks that appear when facing the conductive layer are different from each other. The identification body according to any one of claims 1 to 3,
The antenna has a plurality of regions provided to face the conductive layer through the insulating layer,
In the antenna, the frequency of the resonance peak expressed by facing the conductive layer is different for each of the plurality of regions,
Each of the plurality of regions is one of a region where the antenna is provided and a region where the antenna is not provided.
An identifier that represents identification information by a combination of binary information based on whether or not a resonance peak is detected for each of the plurality of regions.

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