WO2019031534A1

WO2019031534A1 - Rf tag antenna and rf tag

Info

Publication number: WO2019031534A1
Application number: PCT/JP2018/029700
Authority: WO
Inventors: 詩朗杉村
Original assignee: 株式会社フェニックスソリューション
Priority date: 2017-08-09
Filing date: 2018-08-08
Publication date: 2019-02-14
Also published as: JPWO2019031534A1

Abstract

[Problem] To provide an RF tag with which inductance can be made constant, and non-directional radio waves can be received by adhering a separable inlet to an antenna part. [Solution] In an RF tag 100, the following are separately formed: an attachment part 200 which comprises an IC chip 500 and an inductor pattern; and an antenna part 300 which is used for transmitting/receiving data transmitted from a reading device. The attachment part 200 is adhered to the antenna part 300 to form a capacitor with which communication with the reading device is performed.

Description

RF tag antenna and RF tag

The present invention relates to a low-profile RF tag antenna and an RF tag.

For example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2016-173747), an RFID tag that can suppress a decrease in communication performance when in contact with or in proximity to a conductor or a high dielectric, and can achieve both thinning and cost reduction Is disclosed.

The RFID tag described in Patent Document 1 includes a stacked body including one conductive layer as an intermediate layer, an antenna provided on the stacked body, and an IC chip connected to the antenna, and one conductive layer includes It has at least one structure including a neck portion.

Patent Document 2 (Japanese Patent Application Laid-Open No. 2016-58062) discloses an RFID tag that prevents a semiconductor chip from breaking.

In the RFID tag described in Patent Document 2, the base material, the semiconductor chip mounted on the base material, and the semiconductor chip are covered, and the folding line starting point of the folding line is released from the semiconductor chip when it is folded. And an island-like reinforcing material for reinforcing the base material.

Patent Document 3 (Japanese Patent Laid-Open No. 2014-222423) discloses a package with an RFID tag capable of performing wireless communication in the UHF band without causing a decrease in communication distance and an increase in size.

In the RFID tag-equipped package described in Patent Document 3, the RFID tag-attached package including the package to which the RFID tag is attached and in which the package is enclosed, the package functions as an antenna for communication of the RFID tag. The RFID tag has an IC chip and two conductive members individually connected to two electrodes of the IC chip, and the two conductive One of the members is attached to the surface of the sheet via the insulating member so that at least a part thereof is located on one side of the slit with respect to the width direction of the slit, the other of the two conductive members is at least a part of the slit Is attached to the surface of the sheet via the insulating member so as to be located on the other side of the slit with respect to the width direction of the Once cut along the imaginary line including the line in which the RFID tag becomes poor communication.

Patent Document 4 (Japanese Patent Laid-Open No. 2008-107947) discloses an RFID tag that transmits and receives data without contact with an external data read / write device, the RFID tag being a package made of aluminum foil and a metal-deposited film. The RFID tag is disclosed that does not malfunction even if the RFID tag is attached to a material or attached to a large cardboard or the like.

In the RFID tag described in Patent Document 4, an RFID chip that transmits and receives data contactlessly with an external data read / write device, an IC chip and an IC chip used to transmit and receive data at least contactlessly with the support. The inlet formed with the conductive wire and the antenna used for transmission and reception are separately formed, and by adhering the inlet and the antenna, the conductive wire and the antenna are connected by capacitor coupling.

Patent Document 5 (Japanese Unexamined Patent Publication No. 2011-221838) discloses a wireless communication tag which can prohibit communication outside the management area.

In the tag for wireless communication described in Patent Document 5, in the tag for wireless communication having a semiconductor chip performing a communication operation with an external communication device, the semiconductor chip is mounted and electrically connected to the semiconductor chip. An antenna module having a tag having a power receiving unit, an antenna unit for receiving radio waves from a communication device, and a feeding unit electrically connected to the antenna unit, and having a configuration that can be attached to and detached from the tag. When the tag is connected to the antenna module, the power reception unit and the power supply unit are electrically connected to be in a communicable state with the communication device.

Patent Document 6 (Japanese Patent Application Laid-Open No. 2012-70076) discloses an RF-ID media which sufficiently achieves the effect of the booster antenna in the RF-ID media using the booster antenna.

In the RF-ID media described in Patent Document 6, a second antenna is formed on a second base substrate on a first base substrate on which a first antenna in which current flows by an electromagnetic wave from the outside is formed. In the RF-ID media on which an inlet formed is mounted and on which an IC chip connected to the second antenna is mounted, and the current flows to the second antenna by electromagnetic induction by the current flowing to the first antenna The second antenna consists of two spiral antenna parts whose outer peripheral end is connected to the IC chip and wound in the same direction and the inner peripheral end is opened, and the first antenna is When the inlet is mounted on one of the base substrates, two unequal regions are formed along the overlapping portion of the outer peripheral portion of each of the two antenna portions including the region between the two antenna portions. And has a current path in which a current flows by electromagnetic waves in the opposite direction of the spiral for na section.

Patent Document 7 (Japanese Patent Application Laid-Open No. 2008-117165) relates to an RFID tag in which even if the RFID tags are overlapped, a reading failure due to the interference of radio waves does not occur, and a spacer is not necessary between the RFID tags to be overlapped. It is disclosed.

The wireless communication tag described in Patent Document 7 is an IC tag including an IC chip operated by a wireless wave and an antenna formed of a metal film layer formed on a base of an insulator, The antenna includes a slit for impedance matching, one first antenna on which the IC chip is mounted, and at least one second antenna on which the IC chip is not mounted, and the first antenna and the at least one first antenna The two antennas are capacitively coupled.

Patent Document 8 (Japanese Patent Application Laid-Open No. 2013-54751) discloses an RFID information medium capable of appropriate communication with a reading device (or reading and writing device) and easily miniaturized.

The RFID information medium described in Patent Document 8 is an RFID information medium that performs data communication without contact with an external reader, and includes a main body having an insulating member, an antenna member provided in the main body, and a main body. And an optical change device whose color or image changes depending on visual observation, the conductor having a layer of a conductive material, the layer of the conductive material being a member for an antenna Partially overlapping in the thickness direction of the main body, the optical change device comprises a conductive reflective layer or a conductive transparent layer, and the reflective layer or transparent layer of the optical change device comprises a conductive material Is also used as a layer of

JP, 2016-173747, A JP, 2016-58062, A JP 2014-222423 A JP, 2008-107947, A JP 2011-221838 A JP, 2012-70076, A JP, 2008-117165, A JP, 2013-54751, A

Although various RF tags are developed in Patent Documents 1 to 8 described above, there is a problem that they do not operate mainly when they are stuck on metal. Even when the problem is cleared, there arises a problem that the inductance can not be kept constant in forming the RF tag.

An object of the present invention is to provide an RF tag capable of receiving an omnidirectional radio wave by making an inductance constant and attaching a separable inlet to an antenna unit.

(1)
In the RF tag according to one aspect, the inlet including the IC chip and the inductor pattern and the antenna unit used to transmit and receive data transmitted from the reader are separately formed, and the inlet is attached to the antenna unit. And a capacitor is formed to communicate with the reader.

In this case, by sticking the inlet and the antenna unit, the sticking member becomes a capacitor and forms a resonant circuit. As a result, transmission and reception can be performed as an RF tag.
Further, since the inductor pattern is formed on the inlet, the impedance of the inductance can be made constant.

(2)
In the RF tag according to the second aspect of the present invention, in the RF tag according to one aspect, the inlet has a shape lacking a part of the annular circuit part, and IC chips are provided at both ends of the part lacking the part. It may be arranged to be bridged.

In this case, since the IC chip is disposed so as to be bridged over the both ends of the circuit portion lacking the part of the annular shape, the inductance pattern can be determined by the annular shape. .

(3)
In the RF tag according to the third aspect of the present invention, in the RF tag according to the one aspect or the second aspect, an insulating layer made of foam may be provided between the inlet and the antenna portion.

In this case, the capacitor capacity can be determined by providing an insulating layer made of foam between the inlet and the antenna portion. In particular, by setting the thickness of the insulating layer made of foam to 0.5 mm or more and 3 mm or less, the sensitivity of the RF tag can be improved.

(4)
In the RF tag according to the fourth aspect of the present invention, in any of the RF tags according to the first aspect to the third aspect, a part of the antenna portion can be overlapped with a shape in which a part of the annular circuit portion of the inlet is missing. It may be of any shape.

In this case, since a part of the antenna portion can be overlapped with the annular shape of the inlet, the RF tag can be efficiently formed.

(5)
In the RF tag according to the fifth aspect of the present invention, in any of the RF tags according to the first aspect to the fourth aspect, the antenna unit may be a flat plate antenna.

In this case, since the antenna unit is formed of a flat plate antenna, thinning of the RF tag can be realized.

(6)
In the RF tag according to the sixth aspect of the present invention, in any of the RF tags according to the first aspect to the fifth aspect, the width of the antenna unit may have a ratio of 〇 to 〇 with respect to the width of the inductor pattern. .

In this case, since the ratio of the width of the antenna unit to the width of the inductor pattern is 〇 or 〇, the shift can be absorbed when the inlet is attached to the antenna unit.

(7)
In the RF tag according to the seventh invention, in any of the RF tags according to the one aspect to the sixth invention, the capacitance of the capacitor may be in the range of 2 PF or more and 3 PF or less.

In this case, stable connection can be made. For example, in the case of polyethylene terephthalate (PET thickness 60 μm), a contact capacity of 20 PF can be obtained in a 1 cm square when the inlet and the antenna unit are attached. Therefore, in the case of using at 900 MHz, when the capacitance of the capacitor for connecting the inlets in series is 2 PF or more, it can be stably joined.
In addition, desirably, it is desirable to be within the range of 1 PF or more and 3 PF or less, and more desirably within the range of 1.5 PF or more and 2 PF or less.

(7)
The RF tag according to the seventh invention is any of the RF tags according to the first aspect to the sixth invention, wherein the antenna unit is any of a bag, a box, a film for wrapping a product, and a seal attached to a product. May be formed.

In this case, the antenna unit can form an RF tag on a bag, a box, a film for packaging a product, and a seal attached to the product, so that data communication can be reliably performed.

It is a schematic diagram which shows an example of the plane of RF tag concerning this Embodiment. It is a schematic plan view which shows an example of the attachment part of RF tag concerning this Embodiment. It is a schematic plan view which shows an example of the antenna part of RF tag. FIG. 4 is a schematic view showing an example of an AA cross section of the RF tag of FIG. 3; It is a figure which shows an example of the equivalent circuit of RF tag of FIG. It is a RF tag which shows the other example which sticks an attachment part and an antenna part. It is a schematic diagram which shows the other example of an antenna part. It is a schematic diagram which shows the other example of an antenna part. It is a schematic diagram which shows the other example of an antenna part. It is a figure which shows the RF tag which stuck the attachment part to the antenna part. It is a schematic diagram which shows the other example of an antenna part. It is a figure which shows the RF tag which stuck the attachment part to the antenna part. It is a schematic diagram which shows the other example of an antenna part. It is a figure which shows the RF tag which stuck the attachment part to the antenna part. It is a schematic diagram which shows the other example of an antenna part. It is a figure which shows the RF tag which stuck the attachment part to the antenna part. It is a schematic diagram which shows an example of use of RF tag.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. Moreover, in the case of the same sign, their names and functions are also the same. Therefore, detailed description about them shall not be repeated.

This Embodiment
FIG. 1 is a schematic view showing an example of a plane of an RF tag 100 according to the present embodiment. FIG. 2 is a schematic plan view showing an example of the attachment unit 200 of the RF tag 100, and FIG. 3 is a schematic plan view showing an example of the antenna unit 300 of the RF tag 100. As shown in FIG. FIG. 4 is a schematic view showing an example of an AA cross section of the RF tag 100 of FIG.

(RF tag 100)
As shown in FIG. 1, the RF tag 100 mainly includes an attachment unit 200 and an antenna unit 300.
In addition, the attachment unit 200 is formed of a separate member from the antenna unit 300. The RF tag 100 is formed by sticking the attachment unit 200 to the antenna unit 300 with the adhesive layer 400 (see FIG. 4).

(Antenna unit 300)
As shown in FIG. 3, the antenna unit 300 is made of a conductive member. The antenna unit 300 includes a first area 310, a second area 320 and a third area 330. The first region 310 and the third region 330 have a rectangular shape having a longitudinal direction, and have substantially the same shape. The first area 310 and the third area 330 are arranged in parallel. The second member 320 is formed to communicate the ends of the first area 310 and the third area 330.

In the present embodiment, the width of the first area 310 and the third area 330 is T1, and the width of the second area 320 is T2.

Furthermore, in the present embodiment, the first region 310, the second region 320, and the third region 330 of the antenna unit 300 are made of a metal thin film of aluminum. Generally, the thin film in the present embodiment is formed to have a thickness of 3 μm to 35 μm.
The antenna unit 300 is formed by a method such as etching or pattern printing.

(Attachment unit 200)
As shown in FIG. 2, the attachment unit 200 includes an IC chip 500 and a circuit 210 that forms an inductor pattern L.
The circuit 210 has a shape having a cutaway portion in which a part of the substantially annular circuit portion 211 is cut out. That is, specifically, it consists of C shape of an alphabet character.
The circuit unit 211 is formed of a side 211 a, a side 211 b, a side 211 c, a side 211 d, and a side 211 e.
Although the circuit 210 has been described in the case where a part of the circuit portion 211 is cut out, the present invention is not limited to this and an insulating portion may be formed.

In the present embodiment, the circuit 210 is made of a metal thin film of aluminum. Generally, the thin film in the present embodiment is formed to have a thickness of 3 μm to 35 μm.
The circuit 210 is formed by a technique such as etching or pattern printing.

In addition, an IC chip 500 is provided to bridge the cutaway portion of the circuit 210 of the attachment unit 200.
In the present embodiment, in the attachment unit 200, the impedance of the inductor pattern L can be made constant due to the internal area S of the circuit unit 211.

The IC chip 500 operates based on the radio wave of the reading device received by the antenna unit 300 of the RF tag 100.
Specifically, the IC chip 500 according to the present embodiment first rectifies a part of the carrier wave transmitted from the reader to generate a power supply voltage necessary for the IC chip 500 itself to operate. Then, the IC chip 500 operates the non-volatile memory in which the control logic circuit in the IC chip 500, the unique information of the product, and the like are stored by the generated power supply voltage.

In addition, the IC chip 500 operates a communication circuit and the like for transmitting and receiving data to and from the reader.
In addition, a sheet member may be provided on a portion of the attachment unit 200 where the adhesive layer 400 is not provided, for example, the surface opposite to the surface on which the adhesive layer 400 is provided.

As the sheet member, one or more insulating materials or resins such as polyethylene terephthalate, polyimide, polyvinyl chloride, etc. may be used mainly, and other insulating film processing may be used.
As a result, the attachment unit 200 can be protected. The thickness of the sheet member is preferably several micrometers or more and several hundred micrometers or less, and more preferably several tens micrometers or so.

Further, as described above, the attachment unit 200 is attached to the antenna unit 300 via the adhesive layer 400 (see FIG. 4). By holding the adhesive layer 400, a capacitor (capacitance, capacitance) is formed.

(Adhesive layer 400)
Adhesive layer 400 in the present embodiment shown in FIG. 1 is made of double-sided tape. The adhesive layer 400 is provided on the attachment portion 200.
In the present embodiment, the adhesive layer 400 is made of a double-sided tape. However, the present invention is not limited to this, and other adhesive layers may be formed or an adhesive may be applied. Also, the double-sided tape may be a part of the entire surface of the circuit unit 211 of the attachment unit 200 instead of the entire surface.
In the present embodiment, the double-sided adhesive tape is exemplified because the attachment unit 200 of the RF tag 100 is attached to the antenna unit 300 as described later, so the peeling sheet of the double-sided adhesive tape can be easily peeled off. It is because sticking is possible.

Further, in the present embodiment, it is desirable that the width T1 of the first region 310 of the antenna unit 300 be formed at least one time and at most four times the width T211 of the circuit unit 211 of the attachment unit 200.
Further, it is desirable that the width T2 of the second region 320 of the antenna unit 300 be formed to be 1 to 4 times the width T212 of the circuit unit 211 of the attachment unit 200.
Further, the width T 213 of the circuit portion 211 of the attachment portion 200 is desirably formed to be 1 to 4 times the width T 212 of the circuit portion 211 of the attachment portion 200.

(Equivalent circuit)
5 is a view showing an example of an equivalent circuit of the RF tag 100 of FIG.
As shown in FIG. 5, the equivalent circuit of the RF tag 100 includes an inductor pattern L, a capacitor C, and an IC chip 500. The inductor pattern L, the capacitor C, and the IC chip 500 constitute a resonant circuit that resonates in the frequency band of the radio wave transmitted from the reader.
The resonant frequency f [Hz] of this resonant circuit is given by equation (1). The value of the resonance frequency f is set to be included in the frequency band of the radio wave transmitted from the reader.

In the formula (1), _{L a:} inductor pattern L of the inductance, _{C a:} the capacitance of the capacitor _C, C b: mean the equivalent capacitance of the IC chip 500.

Here, some IC chips 500 include a capacitor inside, and the IC chip 500 has a floating capacitance. Therefore, when setting the resonance frequency f of the resonant circuit, it is preferable to consider the equivalent capacitance C _b of the IC chip 500.
That is, the resonant circuit, the inductance of the inductor pattern L, and preferably having a capacitance, and the IC chip 500 inside the equivalent capacitance C _b was considered set resonant frequency f of the capacitor 240. As C _b , for example, a capacitance value published as one of specification specifications of an IC chip to be used can be used.

As described above, by considering the equivalent capacitance C _b of the IC chip 500, the resonance frequency f of the resonant circuit, it is possible to accurately set the radio frequency band. As a result, the reading performance of the RF tag 100 can be further improved. Further, the power supply voltage generated by the IC chip 500 can be further increased.

(Another example of the RF tag 100)
FIG. 6 is an RF tag 100 a showing another example of attaching the attachment unit 200 and the antenna unit 300.

As shown in FIG. 6, it may be adhered in a state where it is rotated 180 degrees with respect to the adhered state of the RF tag 100 shown in FIG.

(Another example of the antenna unit 300)
FIG. 7 is a schematic view showing another example of the antenna unit 300. As shown in FIG.

As shown in FIG. 7, the antenna unit 300 b has a first area 310 b instead of the first area 310. Further, the letter L shape of the alphabet is formed by the second area 320 and the third area 330, and the end of the first area 310b and the third area 330 are connected by the fourth area 340.

(Another example of the antenna unit 300)
FIG. 8 is a schematic view showing another example of the antenna unit 300. As shown in FIG. The antenna unit 300c illustrated in FIG. 8 is an example of an L-shaped antenna.

As shown in FIG. 8, the antenna unit 300 c has a fourth region 340 instead of the second region 320 of the antenna unit 300.
The antenna unit 300 c connects the first region 310 and the third region 330 by the fourth region 340.

(Another example of the antenna unit 300)
FIG. 9 is a schematic view showing another example of the antenna unit 300, and FIG. 10 is a view showing the RF tag 100 in which the attachment unit 200 is attached to the antenna unit 300d of FIG. The antenna unit 300 d illustrated in FIG. 9 is an example of a loop antenna or a folded antenna.

As shown in FIG. 9, the antenna unit 300 d includes a first region 310, a second region 320, a third region 330, a fifth region 350, and

regions

361, 362, and 363 of the antenna unit 300.
As shown in FIG. 10, the attachment unit 200 is attached to the

regions

361, 362, and 363.

(Another example of the antenna unit 300)
FIG. 11 is a schematic view showing another example of the antenna unit 300, and FIG. 12 is a view showing the RF tag 100 in which the attachment unit 200 is attached to the antenna unit 300e of FIG. The antenna unit 300 e illustrated in FIG. 11 is an example of a dipole antenna.

As shown in FIG. 11, the antenna unit 300 e has a first area 310, a third area 330, and

areas

371 and 372 of the antenna unit 300.
As shown in FIG. 12, the attachment unit 200 is attached to the

areas

371 and 372 and the third area 330.

(Another example of the antenna unit 300)
FIG. 13 is a schematic view showing another example of the antenna unit 300, and FIG. 14 is a view showing the RF tag 100 in which the attachment unit 200 is attached to the antenna unit 300f of FIG. The antenna unit 300 f illustrated in FIG. 13 is an example of a branch feed transmission line type antenna (SHUNT FED ANTENNA).

As shown in FIG. 13, the antenna unit 300 f has a first area 310, a second area 320, a third area 330, and a fifth area 350 of the antenna unit 300.
As shown in FIG. 14, the attachment unit 200 is attached to a part of the first area 310, a part of the third area, and the second area 320.

(Another example of the antenna unit 300)
FIG. 15 is a schematic view showing another example of the antenna unit 300, and FIG. 16 is a view showing the RF tag 100 in which the attachment unit 200 is attached to the antenna unit 300g of FIG. The antenna unit 300g illustrated in FIG. 15 is an example of a monopole antenna.

As shown in FIG. 15, the antenna unit 300 g has a first area 310, a second area 320, a third area 330, and a sixth area 380 of the antenna unit 300.
As shown in FIG. 16, the attachment unit 200 is attached to a part of the first area 310, a part of the third area, and the second area 320.

(Example of using RF tag 100)
FIG. 17 is a schematic view showing an example of use of the RF tag 100. As shown in FIG.

As shown in FIG. 17, the antenna unit 300 may be formed in the package of the bag 900. In particular, the antenna unit 300 may be formed by using an aluminum vapor deposition film, and the aluminum vapor deposition may be added to the outer layer of the film to form the antenna unit 300. As a result, the aluminum deposited film portion can be used as an antenna.
As a matter of course, as shown in FIG. 17, the attachment unit 200 can be attached to the antenna unit 300 to easily form the RF tag 100.

In order to attach the attachment unit 200 to the antenna unit 300 to form the RF tag 100, the attachment unit 200 may be attached to the antenna unit 300 after forming the bag 900, but the bag 900 is usually formed. The attachment portion 200 may be attached to a flat film before being cut.
That is, the antenna portion 300 is formed at the free end portion of the film forming the bag 900 (at a position near the seal portion), and the attachment portion 200 is attached to the antenna portion 300. The bag 900 may be formed from the film with this attachment. When the film is heat sealed, the antenna portion is formed at a position separated from the sealing portion, for example, at a position separated from the sealing portion to a degree in the range of 5 mm or more and 30 mm or less so that the attachment does not deteriorate Is desirable.

In addition, although the aluminum vapor deposition film was illustrated in this Embodiment, it is not limited to this, The antenna part 300 is applicable to the seal | sticker etc. which are stuck on a bag, a box, goods.
Specifically, the antenna portion 300 may be formed of silver, copper, gold, aluminum, tin, lead, iron, mercury, an alloy thereof, or the like.
Furthermore, in the case of a seal attached to a bag, a box, or a product, an aluminum vapor deposition film is also formed on the outside at the time of manufacture, and printing is performed except for the antenna unit 300 to expose the antenna unit 300. Good.

Although the insulating layer is formed of the adhesive layer 400 in this embodiment, the present invention is not limited to this. Other insulating materials such as expanded polystyrene, polyethylene, polyimide, thin foam (borer), etc. may be used. An insulating layer such as foam or material may be provided.

In addition, although the antenna part 300 was formed from the 1st area | region 310 and the 3rd area | region 330 which were parallel mutually, and the 2nd area | region 320 which makes the edge parts of the 1st area | region 310 and the 3rd area 330 continue. 310 and the third region 330 may be non-parallel.

As described above, in the RF tag 100 according to the present embodiment, by adhering the attachment unit 200 and the antenna unit 300, the adhesive layer 400 becomes a capacitor to form a resonant circuit. As a result, the RF tag 100 can transmit and receive with the reader.
Further, since the inductor pattern L is formed on the attachment portion 200, the impedance of the inductance can be made constant.

In addition, since the IC chip 500 is disposed so as to be bridged over the both ends of the circuit portion 211 which is partially devoid of the circuit portion 211, the inductance pattern may be determined by the circuit portion 211. it can.
In addition, since the antenna unit 300 is a flat plate antenna, thinning of the RF tag 100 can be realized. In particular, since the antenna unit 300 can form an RF tag on a bag, a box, a film for wrapping a product, or a seal attached to a product, data communication can be reliably performed.

In the present invention, the RF tag 100 corresponds to an "RF tag", the IC chip 500 corresponds to an "IC chip", the inductor pattern L corresponds to an "inductor pattern", and the attachment unit 200 is an "inlet". The antenna unit 300 corresponds to an “antenna unit”, the circuit unit 211 corresponds to “a shape devoid of a part of an annular shape”, and the adhesive layer 400 corresponds to an “insulating layer made of foam”. Correspondingly, the bag 900 corresponds to “any one of a bag, a box, a film for packaging a product, and a seal attached to a product”.

Although a preferred embodiment of the present invention is as described above, the present invention is not limited thereto. It will be understood that various other embodiments may be made without departing from the spirit and scope of the present invention. Furthermore, in the present embodiment, actions and effects according to the configuration of the present invention are described, but these actions and effects are only examples and do not limit the present invention.

100 RF tag 500 IC chip 200 attachment unit 300 antenna 211 circuit unit 400 adhesive layer 900 bag

Claims

An inlet including an IC chip and an inductor pattern, and an antenna unit used to transmit and receive data transmitted from the reader separately;
An RF tag in which a capacitor is formed by adhering the inlet to the antenna unit, and which communicates with a reader.
The inlet is
The RF tag according to claim 1, wherein the RF chip is formed so as to have a part lacking in an annular circuit part, and an IC chip is provided at both ends of the circuit part lacking in the part.
The RF tag according to claim 1, wherein an insulating layer made of foam is provided between the inlet and the antenna unit.
The RF tag according to any one of claims 1 to 3, wherein a part of the antenna part has a shape capable of overlapping with a shape lacking a part of the annular circuit part of the inlet.
The RF tag according to any one of claims 1 to 4, wherein the antenna unit comprises a conductive material antenna.
The RF tag according to any one of claims 1 to 5, wherein a width of the antenna unit is in a ratio of 1: 1 to 1: 4 with respect to a width of the inductor pattern.
The RF tag according to any one of claims 1 to 6, wherein a capacitance of the capacitor is in a range of 1 PF to 3 PF.
The RF tag according to any one of claims 1 to 7, wherein the antenna unit is formed in any of a bag, a box, a film for packaging a product, and a seal attached to a product.