JP2017199241A - Identification body and id generation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an identification body that can identify ID by a combination of a plurality of antennas having different resonance frequencies, which easily generates the ID.SOLUTION: A plurality of antennas 3a to 3e having different resonance frequencies are formed on a base substrate 2, and a resin layer 4 having a loss coefficient calculated from (specific dielectric constant)×(dielectric loss tangent)×(film thickness [μm])of 0.75 or more is laminated on antennas 3a, 3c, and 3e selected according to ID out of the antennas 3a to 3e.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an identifier and an ID generation method that can identify an ID by a combination of a plurality of antennas having different resonance frequencies.

  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 with respect to the label or tag is mounted. 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 frequencies, and the plurality of antennas without using the IC chip. It is also considered that IDs can be identified by a combination. For example, by changing the shape of the dielectric elements and capacitor elements that make up multiple antennas, or by changing the shape and orientation of the multiple antennas to make the resonance frequency different for each of the multiple antennas, A technique that enables an ID to be expressed is disclosed in Patent Document 1. In this technique, only the resonance frequency of the antenna corresponding to the ID can be detected by cutting the wiring or shorting the capacitor portion of any antenna having different resonance frequencies according to the ID. By doing so, when the number of antennas is N, two pieces of information “1” and “0” can be provided depending on whether or not the resonance frequency can be detected, and (2 ^N −1) pieces of information can be obtained. The ID can be expressed in an identifiable manner.

  Also, a plurality of wiring segments separated from each other are formed by analog printing, which is fixed printing, and a connection segment is additionally formed between desired wiring segments by digital printing, which is variable printing. Is disclosed in Japanese Patent Application Laid-Open No. H10-228688. In this technique, the resonance frequency of the antenna can be varied by combining fixed printing by analog printing and variable printing by digital printing.

Japanese Patent Publication No. 7-80386 Japanese Patent No. 5501601

  However, when the antenna is processed according to the ID as described above, considerable equipment is required, and there is a problem that the resonance frequency cannot be easily changed. For example, when cutting the wiring according to the ID, the wiring portion needs to be exposed to the outside in order to be able to easily cut the wiring. If it is exposed, there is a risk that the wiring will be disconnected unintentionally. Moreover, when short-circuiting the capacitor portion, a dedicated hot pressure device / high frequency equipment is required, and defects are likely to occur. Further, when fixed printing and variable printing are combined, a high-temperature drying oven for drying the conductive ink constituting the wiring segment is required, and IDs cannot be easily generated with different resonance frequencies.

  The present invention has been made in view of the problems of the conventional technology as described above, and it is easy to identify an ID in an identification body that can identify an ID by a combination of a plurality of antennas having different resonance frequencies. An object of the present invention is to provide an identifier and an ID generation method that can be generated.

In order to achieve the above object, the present invention provides:
An identifier that is formed on a base substrate and that can identify an ID using a plurality of conductive antennas having different resonance frequencies or polarization directions,
Loss calculated from (relative dielectric constant) × (dielectric loss tangent) × (film thickness [μm]) ^{1/2 in} at least one conductive antenna selected according to the ID among the plurality of conductive antennas. Dielectrics having a coefficient of 0.75 or more are arranged to face each other.

In the present invention configured as described above, a plurality of conductive antennas having different resonance frequencies or polarization directions are formed on the base substrate, and the plurality of conductive antennas are selected according to the ID. A dielectric having a loss factor of 0.75 or more calculated from (relative dielectric constant) × (dielectric loss tangent) × (film thickness [μm]) ^1/2 is disposed opposite to at least one conductive antenna. By transmitting electromagnetic waves to a plurality of conductive antennas and receiving reflected waves from the plurality of conductive antennas, the resonant frequency or polarization of the conductive antennas depending on the reflected intensity in the received reflected waves. When it is determined that the direction is detected, among the plurality of conductive antennas, in the conductive antenna in which the dielectrics are arranged to face each other, the reflection intensity in the reflected wave decreases, It is not determined that the wave number or polarization direction has been detected. Then, the individual ID for the conductive antenna for which it is determined that the resonance frequency or the polarization direction is detected is the first identifier, and the individual ID for the conductive antenna for which it is determined that the resonance frequency or the polarization direction is not detected is the first ID. The ID is generated by arranging these individual IDs in a predetermined order with the identifier of 2. Here, the plurality of conductive antennas are uniformly formed on the base substrate without depending on the ID, and the conductive antennas may be formed by disposing a dielectric to face the plurality of conductive antennas. Since individual IDs are generated for each, the resonance frequency and reflection intensity can be easily set without causing unintentional disconnection of the conductive antenna, and without using a dedicated hot-pressure device / high-frequency equipment or a high-temperature drying furnace. Different IDs can be generated.

  According to the present invention, an individual ID for each conductive antenna is generated by disposing a dielectric material so as not to face a plurality of conductive antennas that are uniformly formed on the base substrate regardless of ID. Therefore, IDs can be easily generated with different resonance frequencies and reflection intensities without causing unintentional disconnection in the conductive antenna, and without using a dedicated hot-pressor / high-frequency equipment or high-temperature drying furnace. can do.

It is a figure which shows one Embodiment of the identification body of this invention, (a) is a surface figure, (b) is AA 'sectional drawing shown to (a), (c) is the surface which removed the resin layer FIG. It is a figure which shows other embodiment of the identification body of this invention, (a) is a surface figure, (b) is AA 'sectional drawing shown to (a), (c) removed the resin layer. It is a figure which shows the structure of the surface. It is a figure which shows an example of the ID production | generation system which produces | generates and discriminate | determines ID given to the ID tag shown in FIG.1 and FIG.2. It is a figure which shows the change of the frequency characteristic of the reflected wave from an antenna in case the resin layer is laminated | stacked on the antenna. It is a figure which shows the change of the frequency characteristic of the reflected wave from an antenna when the parameter of the dielectric material which comprises a resin layer is changed, (a) is the frequency of the reflected wave when changing the thickness of a dielectric material. The figure which shows the change of a characteristic, (b) is a figure which shows the change of the frequency characteristic of the reflected wave when changing the dielectric loss tangent of a dielectric, (c) is the reflection when changing the relative dielectric constant of a dielectric It is a figure which shows the change of the frequency characteristic of a wave. 6 is a table summarizing changes in frequency characteristics shown in FIG. 5 and calculation coefficients using (relative dielectric constant) × (dielectric loss tangent) × (film thickness [μm]) ^{1/2 at} that time. It is a figure which shows other embodiment of the identification body of this invention, (a) is a front view, (b) is A-A 'sectional drawing shown to (a), (c) is a back view.

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

  1A and 1B are diagrams showing an embodiment of an identifier of the present invention, in which FIG. 1A is a surface view, FIG. 1B is a cross-sectional view taken along line AA ′ shown in FIG. 1A, and FIG. It is a figure which shows the structure of the surface where 4 was removed. In addition, in FIG.1 (c), the area | region where the resin layer 4 is laminated | stacked is shown with the broken line.

  As shown in FIG. 1, the identification body in the present embodiment includes five conductive antennas 3 a to 3 e formed on a base substrate 2 made of an insulating material such as a resin film, and among these antennas 3 a to 3 e, The ID tag 1a is configured by laminating a resin layer 4 on the antennas 3a, 3c, 3e.

  The antennas 3a to 3e have a rectangular outer shape, a shape in which a slit enters the longitudinal direction from one of the short sides, have the same width, and have different lengths in the longitudinal direction. Thus, they have different resonance frequencies. The ID tag 1a is capable of identifying any ID using the antennas 3a to 3e, but the antennas 3a to 3e are all formed uniformly on the base substrate 2 by fixed printing regardless of the ID. Has been.

  The resin layer 4 is laminated | stacked only on antenna 3a, 3c, 3e according to ID provided to ID tag 1a among the antennas 3a-3e formed in the base base material 2. FIG. The resin layer 4 is formed by, for example, applying a resin-containing liquid in a rectangular shape larger than the outer shape of the antennas 3a, 3c, 3e so as to cover the antennas 3a, 3c, 3e by solid printing. It can be laminated on 3e. Thus, the resin layer 4 serving as a dielectric is opposed to the antennas 3a, 3c, and 3e selected according to the ID given to the ID tag 1a among the antennas 3a to 3e formed on the base substrate 2. It is the composition arranged.

  FIG. 2 is a view showing another embodiment of the discriminating body of the present invention, in which (a) is a surface view, (b) is a cross-sectional view taken along line AA ′ shown in (a), and (c) is a resin. It is a figure which shows the structure of the surface which removed the layer 4. FIG. In addition, in FIG.1 (c), the area | region where the resin layer 4 is laminated | stacked is shown with the broken line.

  As shown in FIG. 2, the identification body in this embodiment is different from that shown in FIG. 1 in that the antenna on which the resin layer 4 is laminated is different among the antennas 3 a to 3 e formed on the base substrate 2. . In the ID tag 1b according to this embodiment, the resin layer 4 is laminated only on the antennas 3a, 3c, and 3d among the antennas 3a to 3e.

  The ID tags 1 a and 1 b configured as described above are assigned IDs that can be identified, and among the antennas 3 a to 3 e formed on the base substrate 2, the IDs assigned to the ID tags 1 a and 1 b. The resin layer 4 is laminated on the antenna selected according to the above. When the electromagnetic waves are transmitted to the ID tags 1a and 1b, the individual IDs corresponding to the resonance frequencies detected by the reflection intensity in the reflected wave with respect to the electromagnetic waves are arranged in the order of the resonance frequencies, so that the ID tag The IDs assigned to 1a and 1b are generated and determined.

  Hereinafter, an ID generation method for generating and determining IDs assigned to the ID tags 1a and 1b configured as described above will be described.

  FIG. 3 is a diagram showing an example of an ID generation system that generates and discriminates IDs assigned to the ID tags 1a and 1b shown in FIGS. In FIG. 3, although the illustration of the ID tag 1b is omitted, similarly to the ID tag 1a, the electromagnetic wave transmitted from the reading device 5 is reflected by the ID tag 1b.

  As shown in FIG. 2, the ID generation system in this example includes the ID tag 1a shown in FIG. 1 and a reading device 5 that generates and discriminates the ID assigned to the ID tag 1a. Antennas 30a and 30b, an electromagnetic wave radiation unit 10, a reflected wave reception unit 20, a processing unit 40, and a control unit 50 are included.

  The electromagnetic wave radiation unit 10 transmits electromagnetic waves including the resonance frequencies of the antennas 3a to 3e of the ID tags 1a and 1b via the antenna 30a.

  The reflected wave receiving unit 20 receives the reflected waves from the ID tags 1a and 1b received via the antenna 30b with respect to the electromagnetic waves transmitted from the electromagnetic wave emitting unit 10 via the antenna 30a.

  The processing unit 40 includes a reflection intensity detection unit 41 and an ID generation unit 42.

  The reflection intensity detector 41 detects the reflection intensity in the reflected wave received by the reflected wave receiver 20.

  The ID generation unit 42 determines whether or not the resonance frequency of the antenna in the ID tags 1a and 1b is detected based on the reflection intensity detected by the reflection intensity detection unit 41, and based on the detection result of the resonance frequency, the resonance frequency The individual ID for the antenna determined to be detected as “1” as the first identifier, and the individual ID for the antenna determined as the resonance frequency not detected as “0” as the second identifier. By arranging “1” and “0” in the order of the resonance frequency, the IDs assigned to the ID tags 1a and 1b are generated and determined.

  The control unit 50 controls the emission of electromagnetic waves in the electromagnetic wave emission unit 10 and each process in the processing unit 40.

  In the ID tags 1a and 1b shown in FIGS. 1 and 2, as described above, the reflected wave with respect to the electromagnetic wave irradiated from the reading device 5 shown in FIG. 3 is received by the reading device 5, and reflected in the reflected wave. The assigned ID is generated and discriminated based on the resonance frequency detected by the intensity. By changing the antenna on which the resin layer 4 is laminated among the antennas 3a to 3e, the reading device 5 is made different. The resonance frequencies detected are different.

  Below, the principle which can assign | provide different ID to ID tag 1a, 1b in which the same antennas 3a-3e were formed is demonstrated.

  FIG. 4 is a diagram illustrating a change in frequency characteristics of a reflected wave from the antenna when a resin layer is laminated on the antenna.

  For example, as shown by the solid line in FIG. 4, on a hollow rectangular antenna having a resonance frequency near 6.7 GHz, the dry film thickness is 130 μm, the relative dielectric constant is 3.62, and the dielectric loss tangent at a frequency of 10 GHz is 0. When the resin layer is laminated by applying a 10w% pyrrolidone solution of 804 polyvinylpyrrolidone, as shown by the broken line in FIG. However, the resonance frequency is not detected in the vicinity of 6.7 GHz.

  Also in the ID tags 1a and 1b shown in FIGS. 1 and 2, as described above, if the resonance frequency of the antenna with the resin layer 4 laminated is not detected among the antennas 3a to 3e, the antennas 3a to 3e are detected. Among these, by laminating the resin layer 4 on the antenna selected according to the ID assigned to the ID tags 1a and 1b, the reader 5 generates and discriminates the ID assigned to the ID tags 1a and 1b. Will be able to.

  FIG. 5 is a diagram showing changes in the frequency characteristics of the reflected wave from the antenna when the parameters of the dielectric constituting the resin layer are changed. FIG. 5A shows the case where the thickness of the dielectric is changed. The figure which shows the change of the frequency characteristic of a reflected wave, (b) is a figure which shows the change of the frequency characteristic of a reflected wave when changing the dielectric loss tangent of a dielectric material, (c) is a figure which changes the relative dielectric constant of a dielectric material. It is a figure which shows the change of the frequency characteristic of the reflected wave in a case.

  As shown in FIG. 5 (a), a dielectric film having a relative dielectric constant ε = 3 and a dielectric loss tangent tan σ = 0.2 at a frequency of 10 GHz is laminated on an antenna having a resonance frequency near 8.3 GHz. The frequency characteristic at that time was measured by changing the thickness t to 1 μm, 10 μm, 50 μm, and 100 μm.

  Then, when the film thickness is t = 1 μm, the reflection intensity in the reflected wave from the antenna does not decrease so much and the resonance frequency is detected, but the reflected wave from the antenna increases as the film thickness t of the dielectric increases. Thus, the reflection intensity at the point decreases in a quadratic curve. In addition, when laminating a dielectric material on an antenna by coating, it is appropriate that the film thickness is about 0.5 to 20 μm. Therefore, in order to increase the film thickness, it is considered that a seal made of a dielectric material is applied. It is done. In that case, a film thickness of several hundred μm can be secured.

  Further, as shown in FIG. 5B, a dielectric having a relative dielectric constant = 3 and a film thickness t = 10 μm is laminated on an antenna having a resonance frequency peak near 8.3 GHz, and a dielectric loss tangent tanσ at a frequency of 10 GHz. Was changed to 0.05, 0.1, 0.2, and 0.5, and the frequency characteristics at that time were measured.

  Then, when the dielectric loss tangent tan σ = 0.05, although the resonance frequency is shifted, the reflection intensity in the reflected wave from the antenna does not decrease so much and the resonance frequency is detected. However, as the dielectric loss tangent tan σ of the dielectric increases. As a result, the reflection intensity of the reflected wave from the antenna decreases linearly. Note that, when the dielectric loss tangent is increased, the reflection intensity simply decreases. Therefore, in order to prevent the resonance frequency from being detected, a higher one is desirable. At that time, it is possible to increase the dielectric loss tangent of the resin by mixing a specific additive.

  Further, as shown in FIG. 5C, a dielectric having a film thickness t = 10 μm and a dielectric loss tangent tan σ = 0.2 at a frequency of 10 GHz is laminated on an antenna having a resonance frequency peak in the vicinity of 8.3 GHz. The dielectric constant ε was changed to 2, 3, 4, and 5, and the frequency characteristics at that time were measured.

  Then, as the relative dielectric constant ε of the dielectric increases, the reflection intensity in the reflected wave from the antenna decreases linearly. The relative dielectric constant of a normal polymer material is 2-8. In addition, it is possible to increase the relative dielectric constant of the resin by mixing a specific additive.

Based on the above measurement results, (relative dielectric constant) × (dielectric loss tangent at a frequency of 10 GHz) × (film thickness [μm]) ^1/2 is used as an approximate expression for reducing the reflection intensity in the reflected wave from the antenna. In addition, when the dielectric is laminated on the antenna, it is possible to set a condition for setting the reflection intensity of the reflected wave from the antenna to a level that does not reach the reference for determining that the resonance frequency is detected.

FIG. 6 summarizes the change in the frequency characteristics shown in FIG. 5 and the calculation coefficients using (dielectric constant) × (dielectric loss tangent at a frequency of 10 GHz) × (film thickness [μm]) ^{1/2 at} that time. It is a table.

Generally, when the electromagnetic wave intensity difference is -3 dB, the power is halved. Here, in the change of the frequency characteristic shown in FIG. 5, when the intensity difference of the reflected wave is −3 dB or more, (relative dielectric constant) × (dielectric loss tangent at a frequency of 10 GHz) × (film thickness [μm]) ^{1 The} calculation coefficient by ^{/ 2} is No. in FIG. 2 and No. From the measurement result of 10, it is assumed that it is 0.75 or more.

Therefore, when the dielectric is laminated on the antenna, the condition for making the reflection intensity of the reflected wave from the antenna not reach the standard for determining that the resonance frequency has been detected is (relative dielectric constant). X (dielectric loss tangent at a frequency of 10 GHz) x (film thickness [μm]) A dielectric loss factor calculated from ^1/2 is set to 0.75 or more. This is because the reflection intensity in the reflected wave from the antenna decreases in a quadratic curve as the dielectric film thickness increases, so it is good when the calculation coefficient is small. Correlation is obtained. On the other hand, when the calculated coefficient is large, the deviation becomes somewhat large. However, when the calculated coefficient is large, the reflection intensity is largely decreased, so that the state where it is not determined that the resonance frequency has been detected remains unchanged. In addition, when the calculation coefficient when the intensity difference of the reflected wave is a minute difference such as −1 dB is set as a condition, it is difficult to discriminate from a blur such as noise.

In this way, a dielectric having a loss factor calculated from (relative dielectric constant) × (dielectric loss tangent at a frequency of 10 GHz) × (film thickness [μm]) ^1/2 is 0.75 or more. When the electromagnetic waves are arranged opposite to each other, even if an electromagnetic wave is transmitted to the antenna, the reflection intensity in the reflected wave is reduced, and it is determined that the resonance frequency has not been detected. Therefore, a plurality of conductive antennas having different resonance frequencies are formed on the base substrate, and it is given depending on whether or not it is determined that the resonance frequency is detected in the reflected wave of the electromagnetic wave transmitted to this antenna. For an ID tag whose ID is discriminated, at least one of the plurality of conductive antennas is selected according to the ID, (relative dielectric constant) × (dielectric loss tangent at a frequency of 10 GHz) × (film thickness [μm ]) A dielectric whose loss coefficient calculated from ^1/2 is 0.75 or more is placed oppositely, and it is determined that the resonant frequency is detected by the reflected wave among the plurality of conductive antennas. The individual ID for the conductive antenna is set to “1”, the individual ID for the conductive antenna determined that the resonance frequency has not been detected is set to “0”, and these individual IDs are set to predetermined values. By arranging them in order, IDs can easily be made with different resonance frequencies and reflection intensities without causing unintentional disconnection of the conductive antennas and without using a dedicated hot-pressure device / high-frequency equipment or a high-temperature drying furnace. Can be generated.

  Hereinafter, as a specific example, an ID generated using the ID tags 1a and 1b shown in FIGS. 1 and 2 will be described as an example.

In the ID tag 1a shown in FIG. 1, as described above, five antennas 3a to 3e having different resonance frequencies are formed on the base substrate 2, and among these five conductive antennas 3a to 3e, the antenna 3a , 3c, 3e, the resin layer 4 is laminated. As described above, the loss coefficient calculated from (relative dielectric constant) × (dielectric loss tangent at a frequency of 10 GHz) × (film thickness [μm]) ^{1/2 of} the resin layer 4 is 0.75 or more. When the electromagnetic wave is transmitted from the electromagnetic wave radiation unit 10 of the reading device 5 shown in FIG. 3 to the ID tag 1a, the ID tag 1a received by the reflected wave reception unit 20 of the reading device 5 is configured. In the reflected wave, it is determined that the resonance frequencies of the antennas 3b, 3d are detected, but the resonance frequencies of the antennas 3a, 3c, 3e are not detected.

  Then, in the ID generation unit 42, the individual ID for the antennas 3b and 3d for which the resonance frequency has been detected is set to “1”, and the individual ID for the antennas 3a, 3c and 3e for which the resonance frequency has not been detected is determined. By setting “0” and arranging these “1” and “0” in the order of the resonance frequency, the ID “01010” assigned to the ID tag 1a is generated and determined.

Further, as described above, the ID tag 1b shown in FIG. 2 is configured by laminating the resin layer 4 on the antennas 3a, 3c, and 3d among the antennas 3a to 3e formed on the base substrate 2. Yes. As described above, the loss coefficient calculated from (relative dielectric constant) × (dielectric loss tangent at a frequency of 10 GHz) × (film thickness [μm]) ^{1/2 of} the resin layer 4 is 0.75 or more. When the electromagnetic wave is transmitted from the electromagnetic wave radiation unit 10 of the reading device 5 shown in FIG. 3 to the ID tag 1b, the ID tag 1b received by the reflected wave reception unit 20 of the reading device 5 is configured. In the reflected wave, it is determined that the resonance frequencies of the antennas 3b, 3e are detected, but the resonance frequencies of the antennas 3a, 3c, 3d are not detected.

  Then, in the ID generation unit 42, the individual ID for the antennas 3b and 3e for which the resonance frequency has been detected is set to “1”, and the individual ID for the antennas 3a, 3c and 3d for which it has been determined that the resonance frequency has not been detected. By setting “0” and arranging these “1” and “0” in the order of the resonance frequency, the ID “01001” assigned to the ID tag 1b is generated and determined.

(Other embodiments)
FIGS. 7A and 7B are diagrams showing another embodiment of the discriminator of the present invention, in which FIG. 7A is a front view, FIG. 7B is a cross-sectional view taken along line AA ′ shown in FIG. FIG.

  As shown in FIG. 7, the identification body in this embodiment is different from that shown in FIG. 1 in that the resin layer 4 is not laminated on the antennas 3a, 3c, 3e, but the antenna 3a of the base substrate 2 is used. The ID tag 1c is different in that the resin layer 4 is disposed on the surface opposite to the surface on which -3e is formed to face the antennas 3a, 3c, 3e.

Also in the ID tag 1c according to this embodiment, the resin layer 4 has a loss coefficient calculated from (relative dielectric constant) × (dielectric loss tangent at a frequency of 10 GHz) × (film thickness [μm]) ^1/2. When the electromagnetic wave is transmitted from the electromagnetic wave radiation unit 10 of the reading device 5 shown in FIG. 3, the reflection from the ID tag 1 c received by the reflected wave reception unit 20 of the reading device 5 is configured. In the wave, it is determined that the resonance frequencies of the antennas 3b and 3d have been detected, but it is determined that the resonance frequencies of the antennas 3a, 3c and 3e have not been detected. The ID “01010” assigned to the ID tag 1c is generated and determined.

  In the above-described embodiment, a rectangular resin layer 4 larger than the outer shape of the antennas 3a to 3e is laminated on the antennas 3a, 3c, 3d, and 3e, so that these antennas 3a, 3c, 3d, and 3e are stacked. Although the resin layer 4 is disposed so as to face the antenna layer 3a to 3e, the resin layer 4 having the same shape as the antennas 3a to 3e may be used, or the rectangular resin layer 4 smaller than the outer shape of the antennas 3a to 3e may be used. Good. However, when the rectangular resin layer 4 smaller than the outer shape of the antennas 3a to 3e is used, the degree of reduction in the reflection intensity from the antennas 3a to 3e is weakened.

  Further, in order to make the resonance frequencies of the plurality of antennas formed on the base substrate different from each other, not only the longitudinal lengths of the plurality of antennas are different from each other as described above, but also the same outer shape. However, it is also conceivable to make the slit lengths different from each other.

  In the above-described embodiment, the plurality of antennas can be identified by making the resonance frequencies of the plurality of antennas different from each other. However, by changing the directions of the antennas, the polarization directions can be made different for each antenna. The antenna may be identified by the polarization direction. In that case, priority is given to the polarization direction, and individual IDs are arranged in an order according to the priority.

  The shape of the antenna is not limited to that having a rectangular outer shape and having a slit in the longitudinal direction from one of its short sides as shown in the above-described embodiment.

  Further, in the above-described embodiment, the individual ID for the antenna for which it is determined that the resonance frequency has been detected is “1”, and the individual ID for the antenna for which it has been determined that the resonance frequency has not been detected is “0”. By arranging “1” and “0” in the order of the resonance frequency, the ID assigned to the ID tag is generated and discriminated, but the individual ID for the antenna that is determined to have detected the resonance frequency is “0”. “,” And “1” as the individual ID for the antenna for which it was determined that the resonance frequency was not detected. By arranging these “0” and “1” in the order of the resonance frequency, the ID assigned to the ID tag can be changed. Generation and discrimination may be performed.

DESCRIPTION OF SYMBOLS 1a-1c ID tag 2 Base base material 3a-3e, 30a, 30b Antenna 4 Resin layer 5 Reading apparatus 10 Electromagnetic wave radiation | emission part 20 Reflected wave receiving part 40 Processing part 41 Reflection intensity detection part 42 ID production | generation part 50 Control part

Claims (2)

An identifier that is formed on a base substrate and that can identify an ID using a plurality of conductive antennas having different resonance frequencies or polarization directions,
Loss calculated from (relative dielectric constant) × (dielectric loss tangent) × (film thickness [μm]) ^{1/2 in} at least one conductive antenna selected according to the ID among the plurality of conductive antennas. An identification body in which dielectrics having a coefficient of 0.75 or more are arranged to face each other. An ID generation method for generating an ID using an identifier formed by forming a plurality of conductive antennas having different resonance frequencies or polarization directions on a base substrate,
Loss calculated from (relative dielectric constant) × (dielectric loss tangent) × (film thickness [μm]) ^{1/2 in} at least one conductive antenna selected according to the ID among the plurality of conductive antennas. A process of reducing the reflection intensity in the reflected wave from the conductive antenna by arranging the dielectrics having a coefficient of 0.75 or more to face each other;
A process of transmitting electromagnetic waves to the plurality of conductive antennas and receiving reflected waves of the electromagnetic waves from the plurality of conductive antennas;
The individual ID of the conductive antenna for which it is determined that the resonance frequency or polarization direction is detected based on the reflection intensity in the reflected wave is the first identifier, and the conductivity for which it is determined that the resonance frequency or polarization direction is not detected. An ID generation method comprising: processing an individual ID for an antenna as a second identifier and arranging the individual IDs in a predetermined order.

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