JP6770884B2 - Discriminator - Google Patents

Description

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

In recent years, with the development of the information-oriented society, information is recorded on labels and tags attached to products and the like, and the products and the like are managed using these labels and tags. In information management using such labels and tags, non-contact IC labels and non-contact IC labels equipped with IC chips capable of writing and reading information in a non-contact state with respect to the labels and tags are used. Identification bodies using RFID technology such as type IC tags are rapidly becoming widespread due to their excellent convenience.

The discriminator using such RFID technology is not limited to the one on which the IC chip is mounted as described above, but has a plurality of antennas having different resonance peak frequencies and a plurality of antennas without using the IC chip. It is also considered that the ID can be recognized by the combination of antennas. For example, the shape of the dielectric element and the capacitor element that make up a plurality of antennas may be different, or the shapes and directions of the plurality of antennas may be different, so that the frequency of the resonance peak may be different for each of the plurality of antennas. Patent Documents 1 and 2 disclose techniques that enable IDs to be expressed in combination. By using this technology, when the number of antennas is N, it is possible to have two pieces of information, "1" and "0", depending on the presence or absence of one antenna, and unless all antennas are present. Therefore, (2 ^N -1) IDs can be recognizablely expressed.

Special Fair 7-80386 Gazette Japanese Patent Publication No. 2008-503759

By the way, the discriminator using the RFID technology as described above is often used in contact with the dielectric, such as being attached to a product or the like managed by using the discriminator. In that case, the frequency characteristics of the discriminator change due to the influence of the dielectric, the resonance peak becomes gentle and cannot be detected, or the frequency of the resonance peak shifts significantly, and the ID that becomes the discrimination information is correctly correct. There is a risk that it will not be recognizable.

The present invention has been made in view of the problems of the prior art as described above, and even when the invention is used in contact with a dielectric, the identification information can be obtained without deteriorating convenience. An object of the present invention is to provide an discriminator that can be correctly recognized.

In order to achieve the above object, the present invention
With a conductive layer
It has an antenna provided so as to face each of the front and back surfaces of the conductive layer via an insulating layer, and a resonance peak is generated 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, when the antenna is used in contact with the dielectric, such as when the antenna faces the conductive layer, a resonance peak is generated and the discriminator is attached to a product or the like. In addition, the presence of the conductive layer between the antenna and the dielectric prevents the influence of the dielectric from affecting the frequency characteristics of the discriminator, thereby avoiding changes in the frequency characteristics of the discriminator. , The identification information will be recognized correctly. At that time, since the antennas are provided so as to face each of the front and back surfaces of the conductive layer via the insulating layer, the identification information can be recognized from any surface of the discriminator.

As for an antenna as described above, if the Q value is 30 or less in a state where it does not face the conductive layer, it is possible to develop a sharp resonance peak having a Q value of 30 or more by facing the conductive layer.

Further, if the antennas provided so as to face each other on the front and back surfaces of the conductive layer via the insulating layer have different frequencies of resonance peaks generated by facing the conductive layer, the front and back surfaces of the discriminator are determined. Or it can represent two identification information depending on the method of use.

Further, in the case where the antenna has a plurality of regions facing the conductive layer via the insulating layer, the frequency of the resonance peak generated when the antenna faces the conductive layer differs for each of the plurality of regions. Since each of the plurality of regions is either a region in which the antenna is provided or a region in which the antenna is not provided, in the region where the antenna is provided, the region is opposed to the conductive layer of the antenna. In the region where the developed resonance peak is detected and the antenna is not provided, the resonance peak is not detected and is not detected, and the identification information consisting of a combination of these binary information can be represented.

According to the present invention, when the antenna faces the conductive layer, a resonance peak is generated, and the antenna and the dielectric are used in contact with the dielectric, such as when the discriminator is attached to a product or the like. By interposing a conductive layer between the two, it is possible to prevent the frequency characteristics of the discriminator from changing due to the influence of the dielectric, and the identification information can be correctly recognized by detecting the resonance peak. At that time, since the antennas are provided so as to face each of the front and back surfaces of the conductive layer via the insulating layer, the identification information can be recognized from any surface of the discriminator, and the antenna is in contact with the dielectric. Even when it is used in, the identification information can be correctly recognized without deteriorating the convenience.

Further, when the antennas provided so as to face each of the front and back surfaces of the conductive layer via the insulating layer have different frequencies of resonance peaks that appear when they face the conductive layer, the front and back surfaces of the discriminator are determined. It can represent two identification information depending on the method of use.

Further, in an antenna having a plurality of regions provided so as to face the conductive layer via an insulating layer, the frequency of the resonance peak generated when the antenna faces the conductive layer differs for each of the plurality of regions, and a plurality of regions. Binary information according to the region where the resonance peak is detected and the region where the resonance peak is not detected because each of the regions of is one of the region where the antenna is provided and the region where the antenna is not provided. It is possible to represent identification information consisting of a combination of.

It is a figure which shows an example of the basic form of the discriminator of this invention, (a) is the figure which shows the structure of the front surface, (b) is the cross-sectional view of AA' shown in (a), (c) is the back surface. It is a figure which shows the structure. It is a figure for demonstrating the frequency characteristic of an ID tag in which an antenna is formed only on one surface of one base base material, and (a) shows the frequency characteristic in a state where the ID tag is not in contact with a dielectric. The figure (b) is a figure which shows the frequency characteristic in the state where the ID tag is in contact with a dielectric. It is a figure for demonstrating the frequency characteristic of an ID tag in which an antenna is formed only on one surface of one base base material, and a ground pattern is formed on the whole surface of the other surface, and FIG. The figure which shows the frequency characteristic when the ID is read from the formed surface side, (b) is the figure which shows the frequency characteristic when the ID is read from the surface side where the ground pattern is formed. It is a figure for demonstrating the frequency characteristic of the ID tag shown in FIG. 1, (a) is the figure which shows the frequency characteristic in the state where the ID tag is not in contact with a dielectric, (b) is the 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 which faces a ground pattern, (a) is a figure which shows the characteristic of the antenna which a resonance peak does not appear when facing a ground pattern, (b) is a figure which faces a ground pattern. It is a figure which shows the characteristic of the antenna which the resonance peak appears by this. It is a figure which shows the application example of the ID tag shown in FIG. 1, (a) is the figure which shows the structure of the front surface, (b) is the sectional view of AA' shown in (a), (c) is the back surface. It is a figure which shows the structure. It is a figure which shows an example of the ID recognition system which recognizes the ID attached to the ID tag shown in FIG. It is a figure which shows the other example of the basic form of the discriminator of this invention, (a) is the figure which shows the structure of the surface, (b) is the cross-sectional view of AA' shown in (a), (c) is It is a figure which shows the structure of the 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 view, (b) is the cross-sectional view of AA'shown in (a). It is a figure which shows the modification practical example of the ID tag shown in FIG. 1, (a) is a surface view, (b) is a cross-sectional view of AA'shown in (a).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1A and 1B are views showing an example of a basic form of the discriminator of the present invention, in which FIG. 1A is a diagram showing a surface configuration, FIG. 1B is a sectional view taken along the line AA'shown in FIG. ) Is a diagram showing the configuration of the back surface.

As shown in FIG. 1, the discriminator in this embodiment is configured such that a base base material 10a provided with an antenna region 31 and a base base material 10b provided with an antenna region 32 are laminated via a ground pattern 40. This is the ID tag 1.

The base base materials 10a and 10b are the insulating layers in the present invention, respectively, and are made of an insulating material having the same shape and a thickness of about 200 to 300 μm. As the insulating material, a resin film or the like can be considered, but a material having a small dielectric loss tangent is preferable. The insulating layer may be formed by applying an insulating resin film without using the base base materials 10a and 10b. The antenna regions 31 and 32 are provided on the surfaces of the base base materials 10a and 10b opposite to the laminated surface with the ground pattern 40, respectively, and antennas 21 and 22 made of a conductive material are formed. As a result, the antennas 21 and 22 are provided so as to face each other on the front and back surfaces of the ground pattern 40 via the base base materials 10a and 10b. These antennas 21 and 22 have a rectangular outer shape and have a shape in which a slit is inserted in the longitudinal direction from one of the short sides thereof, and have the same shape as each other and have the same orientation. It is formed at 32. Then, the antennas 21 and 22 face the ground pattern 40 to develop a resonance peak at a frequency corresponding to the shape of the antennas 21 and 22.

The ground pattern 40 is the conductive layer in the present invention, and is formed between the base base materials 10a and 10b on the entire surface of at least one of the laminated surfaces of the base base material 10a and the base base material 10b. As a result, it has a shape that covers the antennas 21 and 22 in a plan view.

In the ID tag 1 configured as described above, since the antennas 21 and 22 face the ground pattern 40 to generate a resonance peak at a frequency corresponding to the shape of the antennas 21 and 22, they are irradiated with electromagnetic waves. The ID assigned to the ID tag 1 can be recognized depending on whether or not the resonance peak is detected in the vicinity of the frequency corresponding to the shape of the antennas 21 and 22 in the reflected wave. Specifically, if the antennas 21 and 22 are formed in the antenna regions 31 and 32, respectively, the resonance peak is detected. Therefore, the ID at that time is set to "1", and either of the antenna regions 31 and 32 Since the resonance peak is not detected unless the antennas 21 and 22 are 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 generate a resonance peak by facing the ground pattern 40 will be described later.

Here, the operation due to the configuration in which the antennas 21 and 22 are provided so as to face each of the front and back surfaces of the ground pattern 40 via the base base materials 10a and 10b will be described.

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

FIG. 2 is a diagram for explaining the frequency characteristics of the ID tag in which the antenna is formed only on one surface of one base material, and FIG. 2A is a state in which the ID tag is not in contact with the dielectric. (B) is a diagram showing the frequency characteristics of the above, and is a diagram showing the frequency characteristics in a state where the ID tag is in contact with the dielectric.

In the ID tag in which the antenna is formed on only one surface of one base base material, the electromagnetic wave is irradiated from the surface side on which the antenna is formed and the reflected wave is received in a state where the antenna is not in contact with the dielectric material. In this case, assuming that the frequency characteristics of the reflected wave are as shown by the solid line in FIG. 2A, when the electromagnetic wave is irradiated from the side opposite to the surface on which the antenna is formed and the reflected wave is received. Even so, the frequency characteristics of the reflected wave are as shown by the broken line in FIG. 2A, the frequency characteristics are almost the same, 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 the ID tag in which the antenna is formed only on one surface of one base material, the frequency characteristics of the reflected wave in the state of not being in contact with the dielectric are as shown by the solid line in FIG. 2 (b). Even if it is a thing, when an electromagnetic wave is irradiated in contact with a dielectric material such as a human hand and the reflected wave is received, the frequency characteristic of the reflected wave becomes as shown by the broken line in FIG. 2 (b). The frequency characteristics change significantly due to the influence of the surrounding environment, and it becomes impossible to correctly recognize the ID due to the resonance peak of the antenna.

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

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

In the ID tag in which the antenna is formed on only one surface of one base material and the ground pattern is formed on the entire surface of the other surface, the surface on which the antenna is formed in a state where the antenna is not in contact with the dielectric material. When an electromagnetic wave is irradiated from the side and the reflected wave is received, assuming that the frequency characteristic of the reflected wave is as shown by the solid line in FIG. 3 (a), it is in contact with a dielectric material such as a human hand. Even when the electromagnetic wave is irradiated from the surface side on which the antenna is formed and the reflected wave is received, the frequency characteristic of the reflected wave is as shown by the broken line in FIG. 3A, and the frequency characteristic is There is almost no change, and the ID due to the resonance peak of the antenna can be correctly recognized regardless of whether or not it is in contact with the dielectric.

However, in an ID tag in which an antenna is formed on only one surface of one base material and a ground pattern is formed on the entire surface of the other surface, electromagnetic waves are irradiated from the surface side 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. 3 (b), the electromagnetic wave is irradiated from the surface side on which the ground pattern is formed and the reflected wave is received. Then, the electromagnetic wave is blocked by the ground pattern, the frequency characteristic of the reflected wave becomes as shown by the broken line in FIG. 3 (b), the resonance peak does not exist in the frequency characteristic, and the ID due to the resonance peak of the antenna is recognized. You will not be able to do it.

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

4A and 4B are diagrams for explaining the frequency characteristics of the ID tag 1 shown in FIG. 1, where FIG. 4A is a diagram showing frequency characteristics in a state where the ID tag 1 is not in contact with a dielectric, and FIG. 4B is a diagram. It is a figure which shows the frequency characteristic when the ID is read from 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 in a state where the antenna 21 is not in contact with the dielectric, the frequency characteristic of the reflected wave is shown in FIG. It is 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 on which the antenna 22 is formed and the reflected wave is received in a state where the antenna 22 is not in contact with the dielectric, the frequency characteristic of the reflected wave is changed. As shown by the broken line in FIG. 4A, the frequency characteristics are almost unchanged, and similarly, the resonance peak is provided 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 in a state where the antenna 21 is not in contact with the dielectric and the reflected wave is received, the antenna 22 is received. Even when the electromagnetic wave is irradiated from the surface side on which the is formed and the reflected wave is received, the frequency characteristic hardly changes, and the resonance peak appears at the same frequency. This is because, 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 orientation, respectively, and the 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 affected 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 on which the antenna 21 is formed and the reflected wave is received in a state where the antenna 21 is not in contact with the dielectric, the frequency characteristic of the reflected wave is changed. In the case shown by the solid line in FIG. 4B, the electromagnetic wave was irradiated from the surface side on which the antenna 21 was formed in contact with the dielectric material such as a human hand, and the reflected wave was received. Even in this case, the frequency characteristics of the reflected wave are as shown by the broken line in FIG. 4 (b), the frequency characteristics are almost unchanged, the resonance peak is present in the region surrounded by the dotted line in the figure, and the dielectric material. The ID due to the resonance peak of the antenna can be recognized regardless of whether or not the antenna is in contact with the antenna. This is the same even when the electromagnetic wave is irradiated from the surface side on which the antenna 22 is formed and the reflected wave is received.

As described above, in the ID tag 1 shown in FIG. 1, even when the electromagnetic wave is irradiated and the reflected wave is received in the state of not being in contact with the dielectric, the electromagnetic wave is irradiated in the state of being in contact with the dielectric. Even when the reflected wave is received, its frequency characteristic hardly changes, and a resonance peak appears at the same frequency. This is because, as described above, the antennas 21 and 22 face the ground pattern 40 to develop a resonance peak at a frequency corresponding to the shape of the antennas 21 and 22, and also come into contact with the dielectric. This is because the influence of the dielectric is blocked by the ground pattern 40 even in such a case.

As described above, in the ID tag 1 shown in FIG. 1, the electromagnetic waves 21 and 22 are provided so as to face each of the front and back surfaces of the ground pattern 40 via the base substrates 10a and 10b. Therefore, whether the electromagnetic wave is irradiated from the surface side on which the antenna 21 is formed and the reflected wave is received, or the electromagnetic wave is irradiated from the surface side on which the antenna 22 is formed and the reflected wave is received. Its frequency characteristics hardly change, resonance peaks appear at the same frequency, and even when an electromagnetic wave is irradiated and the reflected wave is received without contacting the dielectric, the dielectric Even when an electromagnetic wave is irradiated in a state of contact and the reflected wave is received, the frequency characteristic hardly changes and a resonance peak appears at the same frequency. In either case, the resonance of the antennas 21 and 22 The peak is correctly detected, and the identification information based on this resonance peak can be correctly recognized even when the ID tag 1 is used in contact with the dielectric without deteriorating convenience.

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, and FIG. 5B is a diagram. It is a figure which shows the characteristic of the antenna which a resonance peak appears by facing a ground pattern.

As shown by the solid line in FIG. 5 (a), in the antenna having a sharp resonance peak having a Q value exceeding 30, when facing the ground pattern as shown in FIG. 1, it is shown by the broken line in FIG. 5 (a). As such, the resonance peak does not appear.

On the other hand, as shown by the solid line in FIG. 5 (b), in the antenna having a gentle resonance peak having a Q value of 20, when facing the ground pattern as shown in FIG. 1, in FIG. 5 (b). As shown by the broken line, sharp resonance peaks having a Q value of 30 or more appear at different frequencies. As described above, in order for the resonance peak to appear when facing the ground pattern, the Q value needs to be 30 or less, preferably 20 or less, or the resonance peak does not occur with the antenna alone. ..

The Q value is defined as the frequency at the resonance peak being ω ₀ , the frequency at which the vibration energy is half the value of the resonance peak on the lower frequency side than the resonance peak, and ω ₁ on the higher frequency side than the resonance peak. When the frequency at which the vibration energy becomes the half value of the resonance peak is ω ₂ , it is a value represented by Q = ω ₀ / (ω ₂ − ω ₁ ).

Therefore, even in the antennas 21 and 22 shown in FIG. 1, the Q value of the antennas 21 and 22 alone, that is, in the state of not facing the ground pattern 40 is 30 or less, so that the Q value faces the ground pattern 40. A sharp resonance peak with a value of 30 or more will appear.

An application example of actually generating an ID by utilizing the above-mentioned action and recognizing the ID will be described below.

6A and 6B are views showing an application example of the ID tag 1 shown in FIG. 1, in which FIG. 6A is a diagram showing a surface configuration, FIG. 6B is a sectional view taken along the line AA'shown in FIG. c) is a figure which shows the structure of the back surface.

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

The base base materials 110a and 110b are made of, for example, the same as the base base materials 10a and 10b shown in FIG. 1, respectively. The antenna regions 131a to 131e and the antenna regions 132a to 132e are provided so as to face each other on the surfaces of the base base materials 110a and 110b opposite to the laminated surface of the ground pattern 140, respectively.

The antenna regions 131a to 131e and 132a to 132e are assigned different frequencies. In the present embodiment, the antenna regions 131a and 132a are assigned a frequency of 7.0 GHz, the antenna regions 131b and 132b are assigned a frequency of 8.0 GHz, and the antenna regions 131c and 132c are assigned a frequency of 8.0 GHz. , 9.0 GHz is assigned, the antenna regions 131d and 132d are assigned a frequency of 10.0 GHz, and the antenna regions 131e and 132e are assigned a frequency of 11.0 GHz.

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

In the antenna regions 131a and 132a, antennas 121a and 122a in which a resonance peak appears in the vicinity of 7.0 GHz assigned to the antenna regions 131a and 132a are formed so as to face the ground pattern 140, respectively. Antennas 121b and 122b are formed in the antenna regions 131b and 132b so as to face the ground pattern 140 so that the resonance peaks appear in the vicinity of 8.0 GHz assigned to the antenna regions 131b and 132b, respectively. Antennas 121c and 122c are formed in the antenna regions 131c and 132c, respectively, in which resonance peaks are generated in the vicinity of 9.0 GHz assigned to the antenna regions 131c and 132c by facing the ground pattern 140. No antenna is formed in the antenna regions 131d and 132d. In the antenna regions 131e and 132e, antennas 121e and 122e in which a resonance peak appears in the vicinity of 11.0 GHz assigned to the antenna regions 131e and 132e are formed so as to face the ground pattern 140, respectively. 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 is inserted in the longitudinal direction from one of the short sides thereof. However, due to the difference in length in the longitudinal direction, resonance peaks are generated at different frequencies by facing the ground pattern. Further, among the antenna regions 131a to 131e, 132a to 132e, the antennas formed in the antenna regions 131a, 131b, 131d, 131e, 132a, 132b, 132d, 132e have the same longitudinal directions as each other. The antennas formed in the antenna regions 131c and 132c are orthogonal to these in the longitudinal direction and serve as a reference antenna. As described above, the antennas formed in the antenna regions 131a, 131b, 131d, 131e, 132a, 132b, 132d, 132e and the antennas formed in the antenna regions 131c, 132c are polarized because the longitudinal directions are orthogonal to each other. The directions are different from each other.

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

As shown in FIG. 7, the ID recognition system in this example includes an ID tag 101 shown in FIG. 6 and a reader 50 that recognizes an ID assigned to the ID tag 101, and the reader 50 includes a transmitting antenna 51a. It has a receiving antenna 51b, a transmitting unit 52, a receiving unit 53, a processing unit 54, and a control unit 55.

The transmitting unit 52 generates an electromagnetic wave including frequencies assigned to the antenna regions 131a to 131e and 132a to 132e, and irradiates the electromagnetic wave via the transmitting antenna 51a.

The receiving unit 53 receives the reflected wave from the ID tag 101 for the electromagnetic wave radiated 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 the resonance peak in the ID tag 101 according to the level of the received power detected by the receiving unit 53, and detects the resonance peak among the frequencies assigned to the antenna regions 131a to 131e and 132a to 132e. The individual ID for the 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. Recognize the ID assigned to the tag 101. 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 by the transmission unit 52 and each process by the processing unit 54.

When recognizing the ID assigned to the ID tag 101 by using the reader 50 configured as described above, the transmitter 52 allocates 7.0 GHz to 11 assigned to the antenna areas 131a to 131e and 132a to 132e. While sweeping the frequency band including 0.0 GHz, the electromagnetic wave of the frequency band is irradiated to the ID tag 101 via the transmitting antenna 51a.

Then, the reflected wave from the ID tag 101 is received by the receiving unit 53 via the receiving antenna 51b, the level of the received power of the reflected wave is detected, and the receiving unit 54 detects the reception by the receiving unit 53. Resonance peaks are detected by the level of power. In the ID tag 101 shown in FIG. 6, as described above, antennas 121a and 122a in which resonance peaks appear in the vicinity of 7.0 GHz are formed in the antenna regions 131a and 132a, and 8 in the antenna regions 131b and 132b. Antennas 121b and 122b having a resonance peak near 0.0 GHz are formed, and antennas 121c and 122c having a resonance peak near 9.0 GHz are formed in the antenna regions 131c and 132c, and antenna regions 131e and 132e are formed. Since the antennas 121e and 122e in which the resonance peak appears 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 It has a resonance peak at each of 11.0 GHz.

Since the frequencies assigned to the antenna regions 131a to 131e and 132a to 132e are at equal intervals of 1 GHz, the processing unit 54 sets the individual IDs for the frequencies at which resonance peaks are detected at intervals of 1 GHz. The ID tag is set to "1", the individual ID for the frequency at which the resonance peak is not detected is set to "0", and these binary information "1" and "0" are arranged in the order of low frequency, for example. The ID given to 101 is recognized. In the ID tag 101 shown in FIG. 6, since resonance peaks are detected at 7.0 GHz, 8.0 GHz, 9.0 GHz and 11.0 GHz, respectively, as described above, the individual IDs “1” and “ The ID "11101" in which 1 "," 1 "," 0 ", and" 1 "are arranged in this order is recognized. At this time, since the 9.0 GHz resonance peak is due to the reference antennas 121c and 122c whose polarization directions are different from those of the other antennas, it can be distinguished from the other resonance peaks. Therefore, by making sure that the antennas 121c and 122c are formed in the antenna regions 131c and 132c, the individual IDs "1" due to the resonance peaks of the antennas 121c and 122c are arranged so as to be in the center, which is the lowest. When the antennas 121a, 122a and the antennas 121e, 122e are not formed in the antenna regions 131a, 132a to which the frequency is assigned or the antenna regions 131e, 132e to which the highest frequency is assigned, or when the processing unit 54 detects it. Even if the resonance peak is slightly deviated, the ID assigned to the ID tag 101 can be accurately recognized. In order to make the resonance peaks of the reference antennas 121c and 122c distinguishable from those of other antennas, if the waveform of the reflected wave is different from the reflected wave from the other antenna, the polarization directions must be different. It is not limited to what you can do.

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 base material 110a and the base base material 110b between the base base materials 110a and 110b. However, between the base base materials 110a and 110b, at least one of the laminated surfaces of the base base material 110a and the base base material 110b faces the antenna regions 131a to 131e and 132a to 132e. The ground pattern 140 may be laminated so as to cover 131a to 131e and 132a to 132e, respectively. In that case, the ground pattern may not cover a very small area of the antennas facing each other in a plan view, and is also defined as having a shape that covers the antenna in a plan view.

Further, in the one shown in FIG. 6, a frequency is assigned to each of the antenna regions 131a to 131e and 132a to 132e, and the ground pattern 140 is assigned to the antenna regions 131a to 131c, 131e, 132a to 132c, 132e. By facing each other, the antennas 121a to 121c, 121e, 122a to 122c, 122e in which the resonance peak appears in the vicinity of the frequencies assigned to the antenna regions 131a to 131c, 131e, 132a to 132c, 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 frequencies are in each of the antenna regions 131a to 131e and 132a to 132e. Even if is not assigned, the ID assigned to the ID tag can be recognized by arranging the individual IDs determined by whether or not the resonance peak is detected.

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

As shown in FIG. 8, the discriminator 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 base material 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 base material 10a and the antenna 222 formed in the antenna region 32 of the base base material 10b have lengths in the longitudinal direction of each other. They are different, so that the frequencies of the resonant 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 the electromagnetic wave is irradiated from the surface side on which the antenna 21 is formed and the reflected wave is received, the frequency characteristic of the reflected wave is as shown by the solid line in FIG. Depending on the shape of 21, the resonance peak is provided in the vicinity of 8.3 GHz. On the other hand, when the electromagnetic wave is irradiated from the surface side on which 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 because the shape of the antenna 222 is different from that of the antenna 21. As shown by the broken line of, the antenna has a resonance peak in the vicinity of 7.7 GHz depending on 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 to the antenna 222 side due to the ground pattern 40, and the antenna is not affected by the antenna 222. When a resonance peak appears only due to the frequency characteristics of 21 and the electromagnetic wave is irradiated from the surface side on which the antenna 222 is formed and the reflected wave is received, the electromagnetic wave penetrates the antenna 21 side by the ground pattern 40. This is because the resonance peak is generated only by the frequency characteristic of the antenna 222 without being affected by the antenna 21.

As described above, in the ID tag 201 in the present embodiment, the antennas 21 and 222 provided facing the front and back of the ground pattern 40 via the base base materials 10a and 10b are expressed by facing the ground pattern 40. Since the frequencies of the resonance peaks are different from each other, the front and back sides of the ID tag 201 can be determined. Further, two IDs, an ID corresponding to the resonance peak of the antenna 21 and an ID corresponding to the resonance peak of the antenna 222, can be represented according to the usage of the ID tag 201.

10A and 10B are views showing a practical example of the ID tag 1 shown in FIG. 1, where FIG. 10A is a surface view and FIG. 10B is a cross-sectional view taken along the line AA'shown in FIG.

As shown in FIG. 10, 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 resin. 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 to each other by the adhesive layer 70a. , The surface base material 61b is laminated on the surface of the base base material 10b on which the antenna 22 is formed, and the base base material 10b and the surface base material 61b are adhered by the adhesive layer 70b to form the chipless card 60. Conceivable. The base base materials 10a and 10b and the surface base materials 61a and 61b may be adhered by means such as fusion regardless of the adhesive layers 70a and 70b.

Even in the chipless card 60 configured as described above, since the ID tag 1 shown in FIG. 1 is built in, even when it is in contact with a dielectric material such as a human hand, it is on either the front or back side. Even if the 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 views showing a modified practical example of the ID tag 1 shown in FIG. 1, where FIG. 11A is a surface view and FIG. 11B is a cross-sectional view taken along the line AA'shown in FIG.

In this practical example, as shown in FIG. 11, a conductive plate 140 is housed in a thin case-shaped frame member 161 made of an insulating material such as 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 arranged at an intermediate point between the top surface and the bottom surface of the frame member 161. The antenna 21 is on the inner surface of the top surface of the frame member 161 and the antenna 22 is on the bottom surface of the frame member 161. It is formed on the inner surface respectively. As a result, spaces 110a and 110b serving as an insulating layer are generated between the antennas 21 and 22 and the conductive plate 140, respectively.

Even in the chipless card 160 configured as described above, the antennas 21 and 22 that generate resonance peaks when facing the conductive plate 140 are located on the front and back surfaces of the conductive plate 140 via the spaces 110a and 110b that serve as insulating layers. Since the conductive plates 140 are provided facing each other and have a shape that covers the antennas 21 and 22 in a plan view, both the front and back surfaces can be in contact with a dielectric material such as a human hand. Even if the 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 correctly recognized.

1,101,201 ID tags 10a, 10b, 110a, 110b Base base material 21, 22, 121a to 121c, 121e, 122a to 122c, 122e, 222 Antennas 131a to 131e, 132a to 132e Antenna area 40,140 Ground pattern 50 Reader 51a Transmitting antenna 51b Receiving antenna 52 Transmitting unit 53 Receiving 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)

With a conductive layer
It has an antenna provided so as to face each of the front and back surfaces of the conductive layer via an insulating layer, and a resonance peak is generated by facing the conductive layer.
The conductive layer is an discriminator having a shape that covers the antenna in a plan view. In the discriminator according to claim 1,
The antenna is an discriminator having a Q value of 30 or less when not facing the conductive layer. In the discriminator according to claim 1 or 2.
The antennas provided so as to face each of the front and back surfaces of the conductive layer via the insulating layer are discriminators in which the frequencies of resonance peaks generated by facing the conductive layer are different from each other. In the discriminator according to any one of claims 1 to 3,
The antenna has a plurality of regions provided so as to face the conductive layer via the insulating layer.
In the antenna, the frequency of the resonance peak generated by facing the conductive layer differs for each of the plurality of regions.
Each of the plurality of regions is either a region in which the antenna is provided or a region in which the antenna is not provided.
An discriminator that represents identification information by combining binary information depending on whether or not a resonance peak is detected for each of the plurality of regions.

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