RF tag sheet

Abstract

To send information irrespectively of the relation in direction between an antenna to radiate a radio wave to an RF tag and an antenna of the RF tag.SOLUTION: An RF tag sheet 10 comprises an antenna 12, an IC chip 11, an antenna 16 and an IC chip 17. The antenna 12 has a lengthwise direction orthogonal to a lengthwise direction of the antenna 16. The antenna 12, when receiving a radio wave, sends a response radio wave. The IC chip 11 operates on power caused by a radio wave received by the antenna 12. The antenna 16, when receiving a radio wave, sends a response radio wave likewise. The IC chip 17 operates on power caused by a radio wave received by the antenna 16.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an RF tag sheet including a passive RF (Radio Frequency) tag. [Background technology]

[0002] Patent Document 1 describes an RF tag reader having an opening at the top of a storage compartment that reads information from a passive RF tag placed inside the storage compartment with the opening open. The sides of the storage compartment are composed of a front, left, back, and right side. The left, back, and right side each include a radio wave absorbing layer and are higher than the front. The interior of the storage compartment is divided by a storage limiting plate into an attenuation space near the front and a storage space near the back. Items with RF tags attached can be stored in the storage space. Items cannot be stored in the attenuation space. A bottom antenna is installed on the top surface of the bottom. The bottom antenna emits radio waves to the RF tag. The bottom antenna emits high-intensity radio waves toward the storage space and lower-intensity radio waves toward the attenuation space. When the RF tag receives the radio waves emitted from the bottom antenna, it generates power.

[0003] RF tags used in apparel inventory, incoming and outgoing product inspection in logistics, and fixed asset management in the manufacturing industry generally use radio waves in the UHF (Ultra High Frequency) band, with a frequency of 860 to 960 MHz. At such relatively low frequencies, radio waves emitted from the bottom antenna diffract at the edges of the opening and bend around the reader. However, in the RF tag reader described in Patent Document 1, the top edges of the left side, back, and right side are high, so the radio waves emitted from the bottom antenna are attenuated by the time they reach these top edges. Although the top edge of the front is low, the radio waves radiated from the bottom antenna propagate through an attenuation space and are attenuated by the time they reach the front. Therefore, the RF tag reader described in Patent Document 1 can only read information from RF tags placed in the storage space.

[0004] This RF tag reader has a low top end on the front side, so when items or shopping baskets are placed in or removed from the front side, they can be easily placed in or removed from the storage section. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7429399 Summary of the Invention [Problem to be solved by the invention]

[0006] When the bottom antenna emits linearly polarized radio waves, if the longitudinal direction of the RF tag antenna is nearly perpendicular to the direction of the radio wave polarization, the RF tag reading device described in Patent Document 1 cannot read information from the RF tag.

[0007] In contrast, if the bottom antenna emits circularly polarized radio waves, or if linear polarization is used, the radio waves are emitted while switching between horizontal and vertical polarization at high speed, the RF tag reader described in Patent Document 1 can read information from the RF tag in the storage space, except when the longitudinal direction of the RF tag antenna is nearly perpendicular to the surface of the bottom antenna. However, even in this case, when the longitudinal direction of the RF tag antenna is nearly perpendicular to the surface of the bottom antenna, this RF tag reader cannot read information from the RF tag in the storage space.

[0008] An object of the present invention is to provide an RF tag sheet that can transmit information regardless of the relationship between the orientation of the antenna that radiates radio waves to the RF tag and the orientation of the antenna in the RF tag. [Means for solving the problem]

[0009] In order to achieve the above object, the RF tag sheet of the present invention is a first antenna that transmits a response radio wave when receiving the radio wave; a second antenna whose longitudinal direction is perpendicular to the longitudinal direction of the first antenna and which transmits a response radio wave when receiving the radio wave; an IC chip that operates using power generated by radio waves received by the first antenna and / or the second antenna; Equipped with.

[0010] Preferably, the RF tag sheet of the present invention is The first antenna and the second antenna are arranged in an L shape so as not to overlap each other.

[0011] Preferably, the RF tag sheet of the present invention is the IC chip comprises a first IC chip that operates when the first antenna receives radio waves, and a second IC chip that operates when the second antenna receives radio waves; The RF tag includes a first RF tag including the first antenna and the first IC chip, and a second RF tag including the second antenna and the second IC chip. [Effects of the Invention]

[0012] According to the present invention, information can be transmitted regardless of the relationship between the orientation of the antenna that radiates radio waves to the RF tag and the orientation of the antenna in the RF tag. [Brief explanation of the drawings]

[0013] [Figure 1] 1A and 1B are diagrams showing an example of an RF tag sheet including a duplicated RF tag, in which Fig. 1A is a plan view of the RF tag sheet, and Fig. 1B is a front view of the RF tag sheet. [Figure 2] FIG. 1 is a perspective view of an example of an RF tag reader that reads information from an RF tag sheet. [Figure 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 4] FIG. 3 is a cross-sectional view taken along line BB in FIG. 2. [Figure 5] 3 is a plan view of an example of a storage section in the RF tag reader of FIG. 2. FIG. [Figure 6] FIG. 10 is a diagram showing an example in which an RF tag sheet is stored in a storage section of an RF tag reader. [Figure 7] 7A and 7B are diagrams showing another example of the configuration of an RF tag sheet, in which Fig. 7A is a plan view of the RF tag sheet, and Fig. 7B is a front view of the RF tag sheet. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an RF tag sheet according to an embodiment of the present invention will be described in detail with reference to the drawings. In all drawings illustrating the embodiment, the same components are designated by the same reference numerals, and repeated explanations will be omitted.

[0015] FIG. 1 shows an example of an RF tag sheet 10 including duplicated RF tags 11 and 15. The RF tag sheet 10 is, for example, made by sandwiching the RF tag 11 and RF tag 15 between thin hard paper on the front and back sides. The hard paper allows radio waves to pass through. The RF tag 11 and RF tag 15 are passive RF tags. The RF tag 11 and RF tag 15 are arranged in an L-shape so that they do not overlap. The longitudinal direction of the RF tag 11 and the longitudinal direction of the RF tag 15 are perpendicular to each other.

[0016] The RF tag 11 has an antenna 12 and an IC chip 13. The RF tag 11 communicates with an RFID (Radio Frequency Identification) reader / writer or the like using radio waves in the UHF band with a frequency of 860 to 960 MHz, for example. When the antenna 12 receives radio waves emitted by the RFID reader / writer or the like, power is generated. The IC chip 13 operates using this power. The IC chip 13 stores a unique tag ID (IDentifier) ​​that is determined so as to uniquely identify an item. In response to the radio waves emitted by the RFID reader / writer or the like, the IC chip 13 transmits a response radio wave. The response radio wave contains information including the tag ID.

[0017] RF tag 15 has an antenna 16 and an IC chip 17. RF tag 15 operates in the same manner as RF tag 11. IC chip 13 and IC chip 17 may store the same information, including a tag ID, or may store different tag IDs but the same information other than the tag ID. Also, the tag ID of IC chip 13 and the tag ID of IC chip 17 may be different.

[0018] Note that RF tag 11 is an example of a first RF tag of the present disclosure, and RF tag 15 is an example of a second RF tag of the present disclosure. Antenna 12 is an example of a first antenna of the present disclosure, and antenna 16 is an example of a second antenna of the present disclosure. IC chip 13 is an example of a first IC chip of the present disclosure, and IC chip 17 is an example of a second IC chip of the present disclosure. IC chip 13 operates using power generated by radio waves received by antenna 12. IC chip 17 operates using power generated by radio waves received by antenna 16.

[0019] Fig. 2 is a perspective view of an example of an RF tag reader 1 that reads information from an RF tag sheet 10. Fig. 3 is a cross-sectional view taken along line AA in Fig. 2. Fig. 4 is a cross-sectional view taken along line BB in Fig. 2. Fig. 4 is a plan view of an example of a storage section 100 in the RF tag reader 1 of Fig. 2. The RF tag reader 1 has a storage section 100 and a control section 200. The storage section 100 has an opening 110 at the top.

[0020] An opening 110 of the storage unit 100 of the RF tag reader 1 allows for the insertion and removal of an article to which an RF tag sheet 10 is attached. The storage space inside the storage unit 100 is capable of storing an article. The article is, for example, a commercial product. The storage space will be described later.

[0021] Furthermore, opening 110 allows for the insertion and removal of a shopping basket containing items. The storage space inside storage unit 100 can store part or all of the shopping basket. For example, when RF tag reader 1 is incorporated into a self-checkout register and used in a store, items with RF tag sheets 10 attached are displayed on shelves or tables inside the store. Customers select items they like and place them in their shopping baskets. Then, the customer places part or all of the shopping basket into the storage space through opening 110.

[0022] The RF tag sheet 10 is used, for example, for the collective management of multiple items throughout the entire supply chain, including production, intermediate logistics, and sales. The RF tag sheet 10 is used, for example, for inventory management (inspection and inventory) of products in factories, inspection and inventory of products in intermediate logistics, and self-checkouts in stores.

[0023] When an article to which an RF tag sheet 10 is attached is stored inside the storage unit 100, the RF tag reader 1 reads information including the tag ID from the RF tag sheet 10. The RF tag reader 1 communicates with the RF tag sheet 10 using radio waves in the UHF band with a frequency of 860 to 960 MHz, for example.

[0024] As shown in FIGS. 2 to 5 , the housing 100 has a top surface, a bottom surface 120, a front surface 121, a left side surface 122, a rear surface 123, a right side surface 124, a mounting plate 150, a front storage limiting plate 151, a front guide portion 153, and a bottom antenna 160. The top surface has the opening 110 described above. The bottom surface 120 forms the bottom of the housing 100. The bottom surface 120 is, for example, a rectangular flat plate. The bottom surface 120 includes a flat plate 130 and a radio wave shielding layer 140. The radio wave shielding layer 140 covers, for example, the upper surface of the flat plate 130. While the bottom surface 120 does not necessarily include the radio wave shielding layer 140, it is desirable for the bottom surface 120 to include the radio wave shielding layer 140, for example, to suppress radio waves from penetrating into the housing 100 from the outside.

[0025] The radio wave shielding layer is a radio wave absorbing layer or a radio wave reflecting layer. The radio wave shielding layer may include both a radio wave absorbing layer and a radio wave reflecting layer. The radio wave absorbing layer absorbs radio waves. The radio wave absorbing layer is made of, for example, a radio wave absorbing sheet. The radio wave absorbing sheet is a sheet made of a material, for example, rubber mixed with magnetic metal powder. The radio wave reflecting layer reflects radio waves. The radio wave reflecting layer is made of, for example, metal. In the present disclosure, a structure in which a radio wave absorbing layer is stacked on the inner surface (or upper surface) of the housing section 100 and a radio wave reflecting layer is stacked on the outer surface (or lower surface) is also considered to be a type of radio wave absorbing layer.

[0026] The sides of the housing 100 are composed of a front portion 121, a left side portion 122, a back portion 123, and a right side portion 124. The front portion 121 is, for example, a rectangular flat plate. The front portion 121 stands perpendicular to the bottom portion 120 from the front edge of the bottom portion 120. The front portion 121 includes a flat plate 131 and a radio wave shielding layer 141. The radio wave shielding layer 141 covers, for example, the inner surface of the flat plate 131. The front portion 121 does not necessarily have to include the radio wave shielding layer 141, but it is desirable for the front portion 121 to include the radio wave shielding layer 141, for example, to suppress radio waves from entering the housing 100 from the outside. The top end of the front portion 121 is lower than the top ends of the left side portion 122, the back portion 123, and the right side portion 124.

[0027] One end and the other end of the left side surface portion 122 are fixed to one end of the front surface portion 121 and one end of the back surface portion 123, respectively. The left side surface portion 122 is, for example, a rectangular flat plate. The left side surface portion 122 includes a flat plate 132 and an electromagnetic wave absorbing layer 142. The electromagnetic wave absorbing layer 142 covers, for example, the inner surface of the flat plate 132. The left side surface portion 122 stands perpendicular to the bottom surface portion 120 from the left edge of the bottom surface portion 120. The upper end of the left side surface portion 122 is higher than the upper end of the front surface portion 121.

[0028] The rear portion 123 faces the front portion 121. One end and the other end of the rear portion 123 are fixed to the other end of the left side portion 122 and one end of the right side portion 124, respectively. The rear portion 123 is, for example, a rectangular flat plate. The rear portion 123 includes a flat plate 133 and an electromagnetic wave absorbing layer 143. The electromagnetic wave absorbing layer 143 covers, for example, the inner surface of the flat plate 133. The rear portion 123 stands perpendicular to the bottom portion 120 from the edge of the rear side of the bottom portion 120. The upper end of the rear portion 123 is higher than the upper end of the front portion 121.

[0029] The right side surface portion 124 faces the left side surface portion 122. One end and the other end of the right side surface portion 124 are fixed to the other end of the back surface portion 123 and the other end of the front surface portion 121, respectively. The right side surface portion 124 is, for example, a rectangular flat plate. The right side surface portion 124 includes a flat plate 134 and a radio wave absorbing layer 144. The radio wave absorbing layer 144 covers, for example, the inner surface of the flat plate 134. The right side surface portion 124 stands perpendicular to the bottom surface portion 120 from the right edge of the bottom surface portion 120. The upper end of the right side surface portion 124 is higher than the upper end of the front surface portion 121.

[0030] The lower end of front portion 121, the lower end of left side surface portion 122, the lower end of back portion 123, and the lower end of right side surface portion 124 are each fixed to each edge of bottom surface portion 120. Bottom surface portion 120, front surface portion 121, left side surface portion 122, back surface portion 123, and right side surface portion 124 form storage portion 100 that opens upward. This opening is opening 110 described above.

[0031] The bottom antenna 160 is an antenna installed on the top surface of the bottom portion 120. The bottom antenna 160 radiates radio waves upward for communicating with the RF tag sheet 10 and receives response radio waves transmitted from the RF tag sheet 10. The bottom antenna 160 is, for example, a planar antenna or a sheet antenna. The bottom antenna 160 radiates, for example, circularly polarized radio waves, or radiates radio waves while switching between horizontally polarized waves and vertically polarized waves.

[0032] The mounting plate 150 is, for example, a rectangular flat plate. The mounting plate 150 is located above the bottom surface portion 120. The mounting plate 150 is fixed parallel to the bottom surface portion 120, at a predetermined distance from the bottom surface portion 120, for example, to the inner surfaces of the front surface portion 121, the left side surface portion 122, the rear surface portion 123, and the right side surface portion 124. The mounting plate 150 is transparent to radio waves. The front accommodation limiting plate 151 is, for example, a rectangular flat plate. The front accommodation limiting plate 151 is spaced a predetermined distance from the front surface portion 121 and stands vertically from the top surface of the mounting plate 150 between the front surface portion 121 and the rear surface portion 123. The front accommodation limiting plate 151 is transparent to radio waves.

[0033] The front guide portion 153 is, for example, a rectangular flat plate. The lower end of the front guide portion 153 is fixed to the upper end of the front accommodation limiting plate 151. The front guide portion 153 extends diagonally upward, and its upper end is fixed to the upper end of the front portion 121. One end and the other end of the front guide portion 153 are fixed to the inner surface of the left side surface portion 122 and the inner surface of the right side surface portion 124, respectively. The front guide portion 153 allows radio waves to pass through.

[0034] The space above the loading plate 150, surrounded by the front storage limiting plate 151, the left side surface 122, the back surface 123, and the right side surface 124, is the storage space. The storage space is a space that can store some or all of an item and / or a shopping basket. The item or shopping basket is placed on the loading plate 150. The loading plate 150 divides the interior of the storage section 100 into the space between the bottom surface 120 and the loading plate 150, and the space above the loading plate 150. Here, no item or shopping basket is stored in the space between the bottom surface 120 and the loading plate 150. This space is a space where radio waves emitted from the bottom antenna 160 propagate while spreading. The space above the loading plate 150 is a storage space that can store an item or a shopping basket.

[0035] The front storage limiting plate 151 divides the interior of the storage unit 100 into a space between the front portion 121 and the front storage limiting plate 151, and a space between the front storage limiting plate 151 and the rear portion 123. Here, no items or shopping baskets are stored in the space between the front portion 121 and the front storage limiting plate 151. This space is an attenuation space where radio waves radiated from the bottom antenna 160 propagate while attenuating. The space between the front storage limiting plate 151 and the rear portion 123 is the storage space. The bottom antenna 160 is installed on the top surface of the bottom portion 120 in a position where it radiates radio waves with a high intensity toward the storage space and radiates radio waves with a lower intensity than the radio waves radiated toward the storage space toward the attenuation space.

[0036] The control unit 200 has a transmitting / receiving unit 211, an acquiring unit 212, and an I / F (interface) 213. The transmitting / receiving unit 211 causes the bottom antenna 160 to emit circularly polarized radio waves, or when linearly polarized waves are used, causes the bottom antenna 160 to emit radio waves while switching between horizontally polarized waves and vertically polarized waves. When the bottom antenna 160 receives a response radio wave, the transmitting / receiving unit 211 acquires information including the tag ID from the response radio wave.

[0037] The RF tags 11 and 15 included in the RF tag sheet 10 obtain the power necessary for operation by receiving radio waves transmitted from the bottom antenna 160. If the radio waves received by the RF tags 11 and 15 are weaker than a predetermined strength, the RF tags 11 and 15 do not operate and do not transmit response radio waves.

[0038] For example, if the front part 121 includes the radio wave shielding layer 141, waves diffracted at the upper end of the front part 121 leak outside the accommodating part 100. However, radio waves emitted from the bottom antenna 160 are attenuated while propagating through the attenuation space between the front part 121 and the front accommodation limiting plate 151. The transceiver 211 causes the bottom antenna 160 to radiate radio waves toward the attenuation space, at an intensity that will not activate the RF tags 11 and 15 included in the RF tag sheet 10 outside the accommodating part 100 due to the radio waves diffracted at the upper end of the front part 121 and leaking outside the accommodating part 100 through the opening 110.

[0039] Since the strength of the radio waves radiated from the bottom antenna 160 into the storage space between the front storage limiting plate 151 and the back part 123 is high, there is little possibility that information will not be read from the RF tags 11 and 15 included in the RF tag sheet 10 placed in the storage space. On the other hand, the strength of the radio waves radiated from the bottom antenna 160 into the attenuation space between the front part 121 and the front storage limiting plate 151 is low. If the RF tag sheet 10 were placed in the attenuation space, there is a possibility that information will not be read from the RF tags 11 and 15 included in the RF tag sheet 10. However, the RF tag sheet 10 is never placed in the attenuation space.

[0040] Furthermore, the top end of the left side surface portion 122, the top end of the back surface portion 123, and the top end of the right side surface portion 124 are higher than the top end of the front surface portion 121. The radio waves emitted from the bottom antenna 160 are attenuated by the time they reach the top ends of the left side surface portion 122, the top ends of the back surface portion 123, and the top ends of the right side surface portion 124. The attenuated radio waves are diffracted at these top ends (i.e., the periphery of the opening 110), pass over these top ends, and leak from the opening 110 to the outside of the storage portion 100. The transceiver unit 211 causes the bottom antenna 160 to radiate radio waves of an intensity that will not activate the RF tags 11 and RF tags 15 included in the RF tag sheet 10 outside the storage portion 100 due to the radio waves diffracted at these top ends and leaking from the opening 110 to the outside of the storage portion 100.

[0041] Furthermore, radio waves emitted from the bottom antenna 160 may be reflected by the ceiling and reach the RF tag sheet 10 outside the storage unit 100. However, the radio waves are attenuated before reaching the ceiling, and the reflected waves are further attenuated before reaching the RF tag sheet 10 outside the storage unit 100. The transmitter / receiver 211 causes the bottom antenna 160 to emit radio waves of an intensity that will not activate the RF tags 11 and 15 included in the RF tag sheet 10 outside the storage unit 100 due to the radio waves reflected by the ceiling.

[0042] If the RF tags 11 and 15 are not operating, they will not transmit response radio waves, and therefore the RF tag reader 1 will not acquire information from the RF tags 11 and 15 included in the RF tag sheet 10 located outside the storage unit 100. Therefore, when the bottom antenna 160 receives response radio waves from the RF tags 11 and 15, the RF tag reader 1 can acquire only the information read from the RF tags 11 and 15 included in the RF tag sheet 10 located inside the storage unit 100.

[0043] The acquisition unit 212 acquires information about the RF tag 11 and the RF tag 15 contained in the response radio wave received by the bottom antenna 160. The I / F 213 transmits the information about the RF tag 11 and the RF tag 15 acquired by the acquisition unit 212 to an external device (such as an accounting device) and receives operation instructions for the RF tag reading device 1 from the external device.

[0044] If the RF tag 11 and the RF tag 15 have a function of transmitting a Received Signal Strength Indicator (RSSI), the transmitting / receiving unit 211 may acquire information including the RSSI and the tag ID from the response radio wave when the bottom antenna 160 receives the response radio wave. Here, the RSSI indicates the strength of the radio wave emitted from the bottom antenna 160 and received by the RF tag 11 or the RF tag 15. Based on the RSSI acquired from the response radio wave received by the bottom antenna 160, the acquiring unit 212 can determine whether the RF tag sheet 10 including the RF tag 11 and / or RF tag 15 from which the RSSI was acquired is inside or outside the storage unit 100.

[0045] 6 shows an example in which an RF tag sheet 10 is stored in the storage unit 100 of the RF tag reader 1. The RF tag sheet 10 is placed on the mounting plate 150 so that the longitudinal direction of the RF tags 11 is parallel to the surface of the bottom antenna 160. At this time, the longitudinal direction of the RF tags 15 is perpendicular to the surface of the bottom antenna 160. In this case, the acquisition unit 212 cannot acquire information from the RF tags 15, but can acquire information from the RF tags 11.

[0046] 7 shows another example of the configuration of an RF tag sheet. The RF tag sheet 20 has a dual antenna 22 and antenna 26. The RF tag sheet 20 is, for example, made by sandwiching the antennas 22 and 26 between thin hard paper on the front and back sides. An IC chip 23 is attached to the center of the antenna 22. The RF tag sheet 20 communicates with an RFID reader / writer or the like using radio waves in the UHF band with a frequency of 860 to 960 MHz, for example. When the antenna 22 receives radio waves emitted by the RFID reader / writer or the like, power is generated. The IC chip 23 operates using this power.

[0047] The longitudinal direction of antenna 26 is perpendicular to the longitudinal direction of antenna 22. Antennas 22 and 26 are arranged in an L-shape so as not to overlap. The center of antenna 26 is connected to IC chip 23 by a predetermined wiring 28. When antenna 26 receives radio waves emitted by an RFID reader / writer or the like, electric power is generated. A portion of this power is supplied to IC chip 23 via wiring 28. IC chip 23 also operates using this power. In other words, IC chip 23 operates using power generated by the radio waves received by antenna 22 and / or antenna 26. Information stored in IC chip 23 is transmitted to antenna 26 via wiring 28. Antenna 26 transmits a response radio wave containing this information. Note that antenna 22 is an example of a first antenna in the present disclosure, and antenna 26 is an example of a second antenna in the present disclosure.

[0048] Although the above-described embodiment shows an example in which the RF tag sheet of the present disclosure is used in an RF tag reader, the RF tag sheet of the present disclosure can also be used for other purposes. For example, in a building with multiple rooms, an RFID reader / writer antenna can be installed on the ceiling of each room, and each person in the building can wear a name tag including the RF tag sheet of the present disclosure, thereby obtaining the location information of each person.

[0049] In the above-described embodiment, an example was shown in which two RF tags were sandwiched between thin hard paper on the front and back sides, but this is not limited to this. For example, the configuration may be such that two RF tags are attached to one side of a plastic sheet that transmits radio waves.

[0050] As described above, according to the present invention, information can be transmitted regardless of the relationship between the orientation of the antenna that radiates radio waves to the RF tag and the orientation of the antenna in the RF tag. [Explanation of symbols]

[0051] 1...RF tag reader, 10, 20...RF tag sheet, 11, 15...RF tag, 12, 16, 22, 26...antenna, 13, 17, 23...IC chip, 28...wiring, 100...accommodation section, 110...opening, 120...bottom section, 121...front section, 122...left side section, 123...back section, 124...right side section, 130, 131, 132, 133, 134...flat plate, 140, 141...radio wave shielding layer, 142, 143, 144...radio wave absorbing layer, 150...mounting plate, 151...front accommodation limiting plate, 153...front guide section, 160...bottom antenna, 200...control section, 211...transmitting / receiving section, 212...acquisition section, 213...I / F (interface)

Claims

1. a first antenna that transmits a response radio wave when receiving the radio wave; a second antenna whose longitudinal direction is perpendicular to the longitudinal direction of the first antenna and which transmits a response radio wave when receiving the radio wave; an IC chip that operates using power generated by radio waves received by the first antenna and / or the second antenna; An RF tag sheet comprising:

2. The RF tag sheet according to claim 1 , wherein the first antenna and the second antenna are arranged in an L-shape so as not to overlap each other.

3. the IC chip comprises a first IC chip that operates when the first antenna receives radio waves, and a second IC chip that operates when the second antenna receives radio waves; a first RF tag including the first antenna and the first IC chip, and a second RF tag including the second antenna and the second IC chip; The RF tag sheet according to claim 1 or 2.

Images