Wireless apparatus and wireless communication system including the same

Abstract

To provide a wireless apparatus that contains a coiled antenna, and has reduced power loss and high power efficiency, and a wireless communication system including the wireless apparatus.SOLUTION: A wireless apparatus includes a base material, a coiled antenna, and a circuit. The antenna has an intersection where at least a portion thereof intersects at the top and bottom through an insulating film, and the line width of the antenna at the intersection is thinner than the line width of at least a portion of the antenna at a portion other than the intersection.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a wireless device and a wireless communication system including the same. [Background technology]

[0002] Systems that perform communication and power supply using radio waves are known, such as a contactless IC card that performs wireless communication using a 13.56 MHz radio signal (see, for example, Patent Document 1) and a system that enables wireless power supply by magnetically coupling a power supply coil antenna and a power receiving coil antenna (see, for example, Patent Document 2).

[0003] Furthermore, Patent Document 3 discloses a loop antenna having a loop conductive wiring and a jumper wire, in which the loop conductive wiring and the jumper wire intersect at a bent portion of the loop conductive wiring via an insulating layer having a first through hole and a second through hole, thereby reducing the effects of noise. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-220016 A [Patent Document 2] WO2017 / 126419 [Patent Document 3] WO2019 / 175995 issue Summary of the Invention [Problem to be solved by the invention]

[0005] In the antenna shown in Patent Document 3, the symmetry of the antenna shape is improved, which makes it possible to reduce the influence of noise. However, at the intersections of the loop conductive wiring and the jumper wire, capacitance is formed through the insulating layer at each intersection, which causes a problem of power loss.

[0006] The present invention has been made in consideration of the above, and has an object to provide a wireless device including a coil-shaped antenna that reduces power loss and has high power efficiency, and a wireless communication system including the same. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the present invention has the following configuration. [1] A wireless device comprising a substrate, a coil-shaped antenna, and a circuit, wherein at least a portion of the antenna has an intersection where the antenna intersects with the insulating film above and below, and the line width of the antenna at the intersection is narrower than the line width of at least a portion of the antenna other than the intersection. [2] The wireless device according to [1], wherein the insulating film has a thickness of 1 μm or less. [3] A wireless device according to [1] or [2], wherein the line width of the antenna in the non-intersecting portion of the antenna is greater than 100 μm and smaller than 2000 μm. [4] The wireless device according to any one of [1] to [3], wherein the line width of the antenna at the intersection is greater than 10 μm and smaller than 500 μm. [5] The wireless device according to any one of [1] to [4], wherein at least a portion of the circuit portion is disposed inside the antenna portion which is formed in a coil shape. [6] The wireless device according to any one of [1] to [5], wherein the thickness of the antenna at the intersection is different between above and below. [7] The wireless device according to any one of [1] to [6], wherein the materials of the antennas at the intersection are different above and below. [8] The wireless device according to any one of [1] to [7], wherein at least one of the insulating films included in the elements in the circuit is shared with an insulating film at the intersection. [9] A wireless device according to any one of [1] to [8], which is used for preventing counterfeiting.

[10] The wireless device according to any one of [1] to [9], further comprising a sensing unit connected to the circuit.

[11]

[10] A wireless device according to the present invention, wherein the sensing unit is disposed outside the antenna unit which is formed in a coil shape.

[12] A wireless communication system including a wireless device according to any one of [9] to

[11] , and a wireless communication unit capable of supplying power to the wireless device and communicating wirelessly with the wireless device.

[13] A moisture detection system comprising: a wireless device according to

[10] or

[11] ; and a wireless communication unit capable of supplying power to the wireless device and communicating wirelessly with the wireless device, wherein the sensing unit detects moisture.

[14] An opening detection system comprising: a wireless device according to

[10] or

[11] ; and a wireless communication unit capable of supplying power to the wireless device and communicating wirelessly with the wireless device, wherein the sensing unit detects whether a packaging material has been opened.

[15] A temperature detection system comprising: a wireless device according to

[10] or

[11] ; and a wireless communication device capable of supplying power to the wireless device and communicating wirelessly with the wireless device, wherein the sensing unit detects temperature. Effect of the Invention

[0008] According to the present invention, in a wireless device including a coil-shaped antenna, it is possible to provide a wireless device having reduced power loss and high power efficiency, and a wireless communication system including the same. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic plan view showing a wireless device according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic cross-sectional view showing a wireless device according to the first embodiment of the present invention. [Diagram 3] FIG. 3 is a schematic block diagram showing a circuit according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a schematic plan view showing a wireless device according to a second embodiment of the present invention. [Diagram 5] FIG. 5 is a schematic cross-sectional view showing a wireless device according to a second embodiment of the present invention. [Figure 6] FIG. 6 is a schematic cross-sectional view showing a part of a circuit according to the second embodiment of the present invention. [Figure 7] FIG. 7 is a schematic plan view showing a wireless device according to a third embodiment of the present invention. [Figure 8] FIG. 8 is a schematic block diagram showing a circuit according to the third embodiment of the present invention. [Figure 9] FIG. 9 is a schematic diagram showing a wireless communication system according to the fourth embodiment of the present invention. [Figure 10] FIG. 10 is a schematic diagram showing a moisture detection system according to the fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a mode for carrying out the present invention (hereinafter, referred to as "embodiments") will be described with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments, and can be modified in various ways depending on the purpose and application. Furthermore, each element described in each embodiment can be applied to any other embodiment as long as it does not impair the effect of the present invention.

[0011] (Embodiment 1) Fig. 1 is a schematic plan view showing the configuration of a wireless device according to a first embodiment of the present invention, and Fig. 2 is a schematic cross-sectional view taken along the X-X' plane in Fig. 1. The wireless device 100 shown in Figs. 1 and 2 includes a substrate 10, a coil-shaped antenna 20, and a circuit 30.

[0012] The material composition and manufacturing method of the substrate 10 are not particularly limited as long as the substrate 10 has electrical insulation and is configured to allow the formation of the antenna 20 and the circuit 30. The substrate 10 is preferably made of, for example, glass or resin, and is preferably shaped like a plate or film. From the viewpoint of application to various uses, the substrate 10 is preferably a flexible film, and specific examples thereof include, for example, a PET (polyethylene terephthalate) film, a PP (polypropylene) film, a PVC (polyvinyl chloride) film, and a laminate thereof. From the viewpoint of flexibility, the substrate 10 is preferably as thin as possible, and is preferably 10 μm to 1 mm thick, for example.

[0013] The antenna 20 has at least one spiral (hereinafter referred to as "loop") shape, and has a loop portion 201 made of a conductor formed on the same plane, and a jumper portion 202 made of a conductor formed on a plane different from the plane on which the loop portion 201 exists. In the following description, the antenna in the loop portion 201 is called a loop line, and the antenna in the jumper portion 202 is called a jumper line. The loop portion 201 and the jumper portion 202 are arranged via an insulating film 250 having electrical insulation properties. That is, the antenna 20 has intersections (hereinafter simply referred to as "intersections") 204A and 204B where the loop line and the jumper line intersect above and below via the insulating film 250. The loop portion 201 and the jumper portion 202 are electrically connected by contacts 203A and 203B that connect them.

[0014] 1 shows an example in which the number of turns of the loop portion is 3, but the number of turns is not limited as long as the desired characteristics can be obtained with at least 1 turn, but from the viewpoint of use as a coil antenna, the number of turns is preferably more, and is preferably 3 turns or more. On the other hand, from the viewpoint that too many turns increases the area of ​​the loop portion and increases costs, the number of turns is preferably 7 turns or less.

[0015] There are no limitations on the materials constituting the loop wire, jumper wire, and contacts 203A and 203B as long as they are conductive, but materials with high conductivity are preferred from the viewpoint of use as a coil antenna. Examples of such materials include metals such as gold, copper, silver, nickel, tin, bismuth, lead, zinc, palladium, platinum, aluminum, tungsten, and molybdenum, inorganic materials containing at least one element selected from the group consisting of these metals and carbon, mixtures of the above inorganic materials and organic materials, and organic materials having conductivity. These materials are used alone or in combination of two or more types of materials. The materials constituting the loop wire, jumper wire, and contacts 203A and 203B may be the same or different from each other.

[0016] The loop wire, jumper wire and contacts 203A, 203B may each be a single layer made of the above materials, or a laminate comprising multiple layers made of the above materials, or a laminate comprising one or more layers made of the above materials and one or more layers made of other materials.

[0017] It is preferable to select materials suitable for the electrical required characteristics and formation of the loop wire and the jumper wire. For example, since the length of the loop wire as an antenna is relatively long, it is preferable to use a material with high conductivity from the viewpoint of improving the electrical characteristics. In addition, since it can be formed directly on the flat substrate 10, there is no problem even if the workability is somewhat low. On the other hand, although the jumper wire is relatively short, it is formed after the loop portion and the insulating film 250 have already been formed, so it is formed on a material having unevenness. Therefore, it is preferable to use a material with excellent workability for the jumper wire. In this way, it is preferable that the material of the antenna at the intersection is different between the loop wire and the jumper wire depending on the required characteristics.

[0018] The circuit 30 may have any function, material, composition, method of formation, etc., as long as it is electrically connected to the coil-shaped antenna 20 and can obtain desired characteristics. The circuit 30 preferably includes a power circuit for transmitting AC power generated by the antenna 20 due to an external magnetic field or electromagnetic field to each functional element or each functional circuit in the circuit 30.

[0019] The circuit 30 and the antenna 20 may be connected at two points as shown in the present embodiment 1, or may be connected at three or more points. In the present embodiment 1, the jumper wire passes through the loop wire once via the contact portion 203B and is then connected to the circuit, but the jumper wire may be directly connected to the circuit 30.

[0020] FIG. 3 is a block diagram showing the vicinity of the circuit 30 connected to the antenna 20 in the wireless device 100 shown in FIG. 1. The antenna 20 is connected to a power circuit, and the power circuit converts AC power generated by the antenna 20 into DC power suitable for the functional circuit, and the functional circuit realizes a desired function. Although FIG. 3 shows only one functional circuit, a combination of multiple circuits or various elements can be used as the functional circuit to obtain a desired function or characteristic. In addition, the power circuit and the functional circuit are connected by two lines, but this connection is a schematic representation of a power supply and a reference potential (ground potential), and the number of lines and the role of each line are not particularly limited. For example, the power circuit may output multiple power supply voltages, and its configuration and function are not particularly limited as long as it converts AC power generated by the antenna 20 into DC power.

[0021] From the viewpoints of area efficiency and ease of connection to the antenna, the circuit 30 is preferably disposed inside the antenna 20 which is formed in a coil shape.

[0022] There are no particular limitations on the material, composition, film structure, etc. of the insulating film 250 as long as electrical insulation is obtained. From the viewpoint of ensuring electrical insulation between the loop portion and the jumper portion, it is preferable that the insulating film 250 has a high volume resistivity. For example, 5Ω·m or more is preferable, and 1×10 7 The dielectric strength is Ω·m or more. From the viewpoint of reliability, the longer the time until dielectric breakdown occurs, the better. In order to make the entire wireless device 100 as thin as possible and to provide flexibility, the insulating film 250 is preferably thin, and is preferably thinner than the substrate 10. The thickness of the insulating film 250 is preferably 10 μm or less, and more preferably 1 μm or less.

[0023] In the first embodiment, the line widths of the loop line and the jumper line at intersections 204A and 204B are both narrower than the line widths of the lines at the portions where they do not intersect. With this configuration, the overlapping area of ​​the loop line and the jumper line that overlap with each other via insulating film 250 at the intersection of loop section 201 and jumper section 202 is reduced, so that the electrical capacitance formed at the intersection is reduced, and power loss is reduced.

[0024] In this embodiment 1, an example has been shown in which the line widths of both the loop wire and the jumper wire are thin at the intersections 204A and 204B, but as long as the desired characteristics are obtained, a configuration in which the line width of only one of the loop wire and the jumper wire is thin may also be used.

[0025] Furthermore, in this embodiment 1, the area where the loop wire and jumper wire have a narrower line width (hereinafter referred to as the "narrow width area") is an area that extends a little beyond the intersection, including not only the area directly above the intersection but also the areas before and after it. This is done to take into account manufacturing variations, and there is no problem with the manufacturer freely setting the amount of extension as appropriate. Of course, the narrow width area may be limited to the area directly above the intersection. From the viewpoint of reducing the resistance component of the antenna, it is preferable not to extend the narrow width area too much.

[0026] In addition, in this embodiment 1, the line widths of the loop line and the jumper line at the intersection are both thinner than the line widths of each line in all of the parts where they do not intersect, but there is no particular problem if there are parts other than the intersection where the line width is thinner than the intersection as long as the object of the present invention is achieved.

[0027] The line width of the loop line and jumper line at the intersection is appropriately set to a desired value depending on the electrical capacitance formed at the intersection, the resistance due to the current flowing through that part, the life span of electromigration, the Q value (Quality Factor) as a coil antenna, etc. Specifically, the line width of the loop line and jumper line at the intersection is preferably greater than 10 μm and less than 500 μm, and more preferably greater than 30 μm and less than 100 μm. Also, the electrical capacitance formed at the intersection is preferably 10 picofarads (pF) or less per intersection, and more preferably 2 pF or less.

[0028] The line width of the loop wires and jumper wires other than the intersections is preferably thicker because it reduces electrical resistance. On the other hand, if the line width is too thick, the area as an antenna increases, leading to increased costs. For these reasons, the line width of the loop wires and jumper wires other than the intersections is preferably greater than 100 μm and smaller than 2000 μm, and more preferably greater than 300 μm and smaller than 700 μm.

[0029] Regarding the relationship between the line width of the loop wire and the jumper wire, an example in which the jumper wire is thicker than the loop wire is shown in Figure 1, but the relationship is not limited to this. In other words, the loop wire may be thicker than the jumper wire, or they may be the same width.

[0030] From the viewpoint of improving the flexibility of the wireless device, it is preferable that the thickness of the loop wire is thinner than that of the jumper wire. When the wireless device 100 is used for wearable applications, for example, it is important to improve the flexibility. By reducing the thickness of the loop wiring in the loop section 201, which occupies a large area in the wireless device 100, the flexibility is improved. On the other hand, since the jumper section 202 occupies a small area in the wireless device 100 and contributes little to the flexibility of the wireless device 100, by maintaining a certain thickness, adverse effects on the electrical characteristics can be suppressed. In other words, it is preferable that the antenna thickness at the intersection formed by the jumper wire and the loop wire is different between the loop wire and the jumper wire, and it is particularly preferable that the thickness of the loop wire is thinner than the thickness of the jumper wire.

[0031] When wireless device 100 is used in an application where flexibility is not a consideration, it is preferable that loop portion 201 and jumper portion 202 have high conductivity from the standpoint of electrical characteristics, and therefore it is preferable that the loop wire and jumper wire are thick.

[0032] The wireless device of the first embodiment described above has an intersection where a loop wire, which is part of the antenna, and a jumper wire intersect above and below via an insulating film, and the line width of the loop wire and the jumper wire at the intersection is narrower than their line widths at parts other than the intersection, thereby reducing power loss and providing high power efficiency.

[0033] In the first embodiment, a wireless device formed only by the circuit 30 and the antenna 20 is shown, but a capacitance C may be added to form an LC resonant circuit with the antenna 20, and multiple coil-shaped antennas may be arranged.

[0034] (Embodiment 2) Fig. 4 is a schematic plan view showing the configuration of a wireless device according to embodiment 2 of the present invention, and Fig. 5 is a schematic cross-sectional view taken along the Y-Y' plane in Fig. 4. Wireless device 101 shown in Figs. 4 and 5 includes substrate 11, coil-shaped antenna 21, and circuit 31.

[0035] The configuration of wireless device 101 according to the second embodiment is similar to that of wireless device 100 according to the first embodiment, except that insulating film 251 is formed over substantially the entire surface of substrate 11. In this configuration, at least one of the insulating films included in the elements in circuit 31 is insulating film 251. That is, at least one of the insulating films included in the elements in the circuit is shared with an insulating film at an intersection.

[0036] Fig. 6 is a schematic cross-sectional view of a circuit 31 in which at least one of the functional elements is a thin-film transistor. Although Fig. 6 shows only one functional element of the circuit 31, the circuit 31 realizes an electrical function by a collection of multiple functional elements, and may include multiple thin-film transistors or functional elements other than thin-film transistors.

[0037] The thin-film transistor 220 shown in FIG. 6 is composed of a gate electrode 221, a gate insulating layer made of an insulating film 251, source and drain electrodes 222 made of the same material as the jumper wire, and a semiconductor layer 300 on a substrate 11 common to the wireless device 101.

[0038] The loop line and the gate electrode 221 may be made of the same or different materials, and the jumper line and the source and drain electrodes 222 may be made of the same or different materials.

[0039] This thin film transistor 220 is an example in which the semiconductor 300 is present on the insulating film 251 between the source electrode and the drain electrode, but the configuration is not particularly limited as long as the desired characteristics as a thin film transistor are obtained. Other configurations of the thin film transistor include, for example, a so-called top-contact type thin film transistor structure in which the semiconductor 300 extends to the lower part of the source and drain electrodes 222, and a so-called bottom-contact type thin film transistor structure in which the semiconductor 300 extends to the upper part of the source and drain electrodes 222.

[0040] The material of the semiconductor layer 300 is not particularly limited, but preferably contains organic semiconductors, carbon nanotubes, graphene, etc., either alone or as a composite. In particular, from the viewpoint of electrical properties, it is preferable to contain semiconducting carbon nanotubes, and it is particularly preferable that the ratio of semiconducting carbon nanotubes is higher than that of metallic carbon nanotubes. Specifically, it is preferable that 80% or more of the carbon nanotubes are semiconducting, and more preferably 90% or more are semiconducting. Moreover, it is more preferable that the semiconductor layer 300 contains a carbon nanotube composite having a conjugated polymer attached to at least a part of the surface. Examples of such carbon nanotube composites include those disclosed in International Publication No. 2009 / 139339.

[0041] The wireless device according to the second embodiment described above has excellent manufacturing costs because a common insulating film is used for the circuit 31 and the antenna 21.

[0042] In particular, the effect is even greater when the materials constituting the loop line and gate electrode 221, and the materials constituting the jumper line and source and drain electrodes 222 are also common. In addition, when manufacturing such a wireless device, since the circuit 31 and antenna 21 can be manufactured at the same time, there is no need to bond an IC (integrated circuit) such as a silicon semiconductor to the antenna substrate. Therefore, it is possible to provide a wireless device that is thin, has excellent flexibility, and is highly reliable with no peeling of the IC.

[0043] In addition, when the material of the loop line and the material of the jumper line are the same as the gate electrode 221 and the source and drain electrodes 222 of the thin film transistor forming the circuit 31, respectively, it is preferable that they are determined based on the material and configuration required for the thin film transistor in terms of the electrical characteristics and ease of manufacture of the thin film transistor. For example, it is preferable that the material of the loop line is selected so as to realize a desired flat band voltage in the flat band characteristics determined by the gate electrode 221 and the semiconductor layer 300 of the thin film transistor. In addition, it is preferable that the material of the jumper line is selected so as to realize a desired Schottky barrier in the Schottky junction between the source and drain electrodes 222 of the thin film transistor and the semiconductor 300. From these viewpoints, it is preferable that the material of the loop line and the material of the jumper line are different from each other.

[0044] (Embodiment 3) 7 is a schematic plan view showing the configuration of a wireless device according to embodiment 3 of the present invention. Here, this wireless device 102 has a sensing unit 40 connected to the circuit 32 via two wires 400 in addition to the configuration of the wireless device according to embodiment 1.

[0045] Examples of the sensing unit 40 include a moisture detection sensor that detects the presence or absence of moisture, a humidity sensor that detects humidity, and a temperature sensor that detects temperature.

[0046] The number of wirings 400 is not limited to two, and may be one, three or more, and is not particularly limited as long as the desired sensing can be performed. The wirings 400 cross over the loop line via an insulating film (not shown). This insulating layer (not shown) is preferably common to the insulating film 250 present at the intersection of the loop line and the jumper line.

[0047] In the example of FIG. 7, the line width of the wiring 400 is shown as constant, but since the loop line may be affected by the electrical capacitance due to the intersection of the loop line and the wiring 400, and wireless communication characteristics may be deteriorated, the line width of the wiring 400 at the intersection of the loop line and the wiring 400 should not be thick, and is preferably made thinner than the line width of the wiring 400 at the other parts of the intersection. Also, the line width of the loop line at the intersection with the wiring 400 may be made thinner than other parts to reduce the electrical capacitance of the intersection of the wiring 400 and the loop line. Here, the area where the line width of the wiring 400 is narrowed may be an area slightly expanded from the intersection, including not only directly above the intersection but also before and after the intersection. This is in consideration of manufacturing variations, and the manufacturer may freely set the amount of expansion as appropriate. Of course, the area where the line width of the wiring 400 is narrowed may be only directly above the intersection.

[0048] Examples of materials for the wiring 400 include the same materials as those for the antenna 20. From the viewpoint of manufacturing costs, the wiring 400 is preferably made of the same material as the jumper wire and formed simultaneously with the formation of the jumper wire.

[0049] The wiring 400 may transmit a digital signal obtained by digitally processing the information sensed by the sensing unit 40, or may transmit the analog information sensed by the sensing unit 40 as is.

[0050] The circuit 32 includes a sensing processing unit that processes the sensing results of the sensing unit 40 in accordance with the specifications and characteristics of the sensing unit 40, and a wireless transmission unit that transmits the sensing results to the outside of the wireless device 102 via the antenna 20.

[0051] Fig. 8 is a block diagram showing a schematic view of the vicinity of the circuit 32 connected to the antenna 20 in the wireless device 102 shown in Fig. 7. The sensing processing unit connected to the sensing unit 40 processes the signal generated by the sensing unit 40 and transmits the sensing result as a digital signal to the functional circuit. The functional circuit generates an output signal according to the sensing result and transmits the result to the wireless transmission unit, and the wireless transmission unit transmits the result to a power circuit connected to the antenna, thereby changing the impedance of the antenna from the power circuit and communicating the sensing result to the outside.

[0052] In the third embodiment, the wireless transmission unit is connected to the power circuit, but the wireless transmission unit may be directly connected to the antenna. As long as the sensing result of the sensing unit 40 is communicated to the outside, the configuration, control method, and connection are not particularly limited. As long as the sensing result can be wirelessly communicated to the outside, the protocol, frequency, communication method, modulation method, and the like of the method of communicating the sensing result to the outside are not particularly limited. Furthermore, although FIG. 8 shows the circuit 32 consisting of the power circuit, the functional circuit, the sensing processing unit, and the wireless transmission unit, it may include circuits and elements having other functions, and as long as the desired characteristics are obtained, the configuration is not particularly limited.

[0053] The sensing unit 40 is preferably disposed outside the coil-shaped antenna 20. This is because it does not affect the characteristics of the wireless device determined by the antenna 20 and can provide the device with a sensing function.

[0054] The wireless device according to the third embodiment described above makes it possible to realize a wireless device equipped with a sensing function that is low cost, highly flexible, and has improved portability by eliminating the need for a power source or batteries.

[0055] (Embodiment 4) Fig. 9 is a diagram illustrating a wireless communication system according to embodiment 4 of the present invention. The wireless communication system 500 illustrated in Fig. 9 includes the wireless device 100 according to embodiment 1 described above, and a wireless transceiver 50 and an antenna 51 capable of wirelessly communicating with the wireless device 100.

[0056] Here, the wireless device 100 may be only the wireless device shown in the first embodiment, or may be, for example, a wireless device in which an antenna capable of contactless electrical connection is attached to the wireless device shown in the first embodiment to enable wireless communication.

[0057] The wireless transceiver 50 is capable of supplying power to and wirelessly communicating with the wireless device 100. There are no particular limitations on the configuration or structure of the wireless transceiver 50, but it is preferable that the wireless transceiver 50 has a function of transmitting wireless signals at a specific frequency and further receiving signals from the wireless device 100 by backscatter communication.

[0058] Examples of the antenna 51 include an antenna for communication using electromagnetic waves or a coil antenna for communication using a magnetic field, but there are no particular limitations on the type or size of the antenna as long as it enables the desired communication. Although omitted in Fig. 9, the wireless transceiver 50 is connected to a network line outside the device, and can communicate the results of communication with the wireless device 100 to the outside as necessary.

[0059] According to the fourth embodiment described above, communication is performed between the wireless device and the wireless transceiver, and information about the wireless device can be communicated to the outside.

[0060] Moreover, the wireless device according to the fourth embodiment can be attached to a product and used to prevent counterfeiting of the product. Specifically, whether the product is genuine or counterfeit is determined by wireless communication between the wireless device 100 and the wireless transceiver 50. Here, the method of wireless communication is not particularly limited as long as the function of preventing counterfeiting can be realized. Furthermore, the product is not particularly limited, but it is preferable to apply it to products that are expected to have a relatively high counterfeit prevention effect, such as relatively expensive branded products, cosmetics, and medicines. Furthermore, the wireless device may be attached to the product itself or to its packaging material, and the place and method of attachment are not particularly limited as long as the function of preventing counterfeiting can be realized.

[0061] (Embodiment 5) Fig. 10 is a diagram illustrating a moisture detection system that is a wireless communication system according to embodiment 5 of the present invention. The moisture detection system 501 illustrated in Fig. 10 includes the wireless device 102 according to embodiment 3 described above, and a wireless transceiver 60 and an antenna 61 capable of wireless communication with the wireless device 102.

[0062] The wireless device 102 may be only the wireless device shown in embodiment 3, or may be, for example, a wireless device that enables wireless communication by attaching an antenna that can be electrically connected in a non-contact manner to the wireless device shown in embodiment 3.

[0063] Here, the sensing unit of the wireless device 102 detects moisture. For example, moisture can be detected by detecting changes in electrical characteristics, specifically, conductivity, capacitance, impedance, etc., caused by moisture adhering to the sensing unit and transmitting the result to a circuit. Note that moisture detection may detect two stages, the presence or absence of moisture, or may detect multiple states according to the amount of moisture.

[0064] According to the fifth embodiment described above, it is possible to provide a moisture detection system in which communication is performed between a wireless device and a wireless transceiver, and the wireless device is able to communicate to the outside the result that it has detected moisture.

[0065] (Embodiment 6) The wireless communication system according to the sixth embodiment of the present invention is an opening detection system having the same configuration as that of the fifth embodiment, except that the sensing unit of the wireless device 102 shown in the fifth embodiment detects whether or not a packaging material or the like has been opened.

[0066] The sensing unit of the wireless device 102 is not particularly limited in configuration or material as long as the electrical state changes when the packaging material, etc. is opened, but for example, it can be realized by adopting a configuration in which the sensing unit changes from an electrically conductive state to a non-conductive state when the packaging material, etc. is opened. More specifically, for example, the sensing unit 40 in the wireless device 102 is disposed so as to straddle the opening of the packaging material, etc., and when the packaging material is opened, the wiring in the sensing unit 40 is disconnected, making it possible to detect the opening.

[0067] According to the sixth embodiment described above, it is possible to provide an opening detection system in which communication is performed between a wireless device and a wireless transceiver, and the wireless device is able to communicate to the outside the result that it has detected opening.

[0068] (Embodiment 7) The wireless communication system according to the seventh embodiment of the present invention is a temperature detection system having the same configuration as that of the fifth embodiment, except that the sensing unit of the wireless device 102 shown in the fifth embodiment detects temperature.

[0069] The sensing unit of the wireless device 102 is not particularly limited in terms of configuration or material, as long as the electrical state changes with a change in temperature, but it is preferable that the sensing unit has a configuration and / or material in which electrical conductivity changes with a change in temperature. Note that the temperature sensing here may detect the temperature itself, or may be a method in which the sensing result changes only when the temperature is above or below a certain temperature.

[0070] According to the seventh embodiment described above, it is possible to provide a temperature detection system in which communication is performed between a wireless device and a wireless transceiver, and information related to the temperature detected by the wireless device is communicated to the outside. [Explanation of symbols]

[0071] 10, 11 Base material 20, 21 Antenna 30~32 circuits 40 Sensing section 50, 60 Radio transmitter / receiver 51, 61 Antenna 100~102 Wireless equipment 201, 211 Spiral (loop) section 202, 212 Jumper section 203A, 203B, 213A, 213B Contacts 204A, 204B, 214A, 214B intersection 220 Thin-film transistor 221 Gate electrode 222 Source and drain electrodes 250, 251 Insulating film 300 Semiconductor layer 400 Wiring 500 Wireless communication device 501 Moisture Detection System

Claims

1. A wireless device comprising a base material, a coiled antenna, and a circuit, The antenna has an intersection where at least a part of it crosses vertically via an insulating film, A wireless device characterized in that the line width of the antenna at the intersection is narrower than the line width of at least a portion of the antenna in parts other than the intersection.

2. The wireless device according to claim 1, wherein the thickness of the insulating film is 1 μm or less.

3. The wireless device according to claim 1, wherein the line width of the antenna in the portion where the antennas do not intersect is greater than 100 μm and less than 2000 μm.

4. The wireless device according to claim 1, wherein the line width of the antenna at the intersection is greater than 10 μm and less than 500 μm.

5. The wireless device according to claim 1, wherein at least a portion of the circuit section is arranged inside the coil-shaped antenna section.

6. The wireless device according to claim 1, wherein the thickness of the antenna at the intersection differs between the upper and lower parts.

7. The wireless device according to claim 1, wherein the material of the antenna at the intersection is different in the upper and lower parts.

8. The wireless device according to claim 1, wherein at least one of the insulating films included in the elements within the circuit is shared with the insulating film at the intersection.

9. A wireless device according to claim 1, which is used for anti-counterfeiting purposes.

10. A wireless device according to claim 1, further comprising a sensing unit connected to the circuit.

11. A wireless device according to claim 10, wherein the sensing unit is located outside the coil-shaped antenna unit.

12. A wireless communication system comprising a wireless device according to any one of claims 9 to 11, and a wireless communication device capable of supplying power to the wireless device and communicating wirelessly with the wireless device.

13. A moisture detection system comprising a wireless device according to claim 10 or 11, and a wireless communication device capable of supplying power to the wireless device and communicating wirelessly with the wireless device, wherein the sensing unit detects moisture.

14. An opening detection system comprising a wireless device according to claim 10 or 11, and a wireless communication device capable of supplying power to the wireless device and communicating wirelessly with the wireless device, wherein the sensing unit detects whether or not the packaging material has been opened.

15. A temperature detection system comprising a wireless device according to claim 10 or 11, and a wireless communication device capable of supplying power to the wireless device and communicating wirelessly with the wireless device, wherein the sensing unit detects temperature.

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