WO2017043482A1

WO2017043482A1 - Rfid system

Info

Publication number: WO2017043482A1
Application number: PCT/JP2016/076170
Authority: WO
Inventors: 佐伯典貢
Original assignee: タカヤ株式会社
Priority date: 2015-09-11
Filing date: 2016-09-06
Publication date: 2017-03-16
Also published as: JPWO2017043482A1; JP6387194B2

Abstract

Provided is an RFID system with which the position and orientation of cards as well as relatively small managed objects can be detected easily and accurately. In response to a request from a reader/writer 30, a tag control unit 68 reads orientation information acquired by an orientation information detection unit 66, and transmits the orientation information to the reader/writer 30, so orientation information related to the bearing or rotation can be obtained in addition to position information obtained by a plurality of loop antennas (RFID antennas) R1-Rn and C1-Cn. Furthermore, no battery or GPS position detection device is mounted in the RF tag 60, so it is possible to construct a position/orientation detection system that is less expensive than a similar system using a smartphone, beacon, or the like.

Description

RFID system

The present invention relates to an RFID system that acquires information related to the posture and arrangement of a management target on which an RFID type RF tag is mounted.

As a system using an IC card, an IC card that stores information about a game and a player card on which information about the player is recorded as an infrared pattern, and a player card arranged on the player card arrangement panel of the terminal device A card game apparatus that advances a game in consideration of the position is known (Patent Document 1). In this apparatus, the position, the front and back, and the rotation angle are identified without mounting a battery on a player card that is a management object.

As an RFID tag system, a system including a matrix antenna in which antenna elements are arranged in a matrix and a position determination unit that determines the coordinate position of the antenna element in communication with the RFID tag as the position of the RFID tag is known ( Patent Document 2). In this system, not only the position of the management target attached with the RFID tag but also the rotation can be detected by scanning the matrix antenna (see FIGS. 16 to 18).

As a mobile management system using an IC tag, a system including an IC tag and a transmission / reception unit and a mobile terminal attached to the mobile is known (Patent Document 3). In this system, a GPS receiver, an acceleration sensor, and the like in addition to an IC tag are mounted on a moving body, so that the position and other states can be detected (see paragraph [0022]).

However, the device of Patent Document 1 cannot detect the inclination of the management target card. Moreover, in the apparatus of Patent Document 1, if a plurality of management target cards overlap, any management target card cannot be detected. Furthermore, in the apparatus of Patent Literature 1, it is not easy to change information held in the management target card.

In the apparatus of Patent Document 2, when detecting the rotation angle of a management object, it is necessary to mount a plurality of RFID tags on one management object, and there is little information that can be detected although the apparatus configuration is complicated. In the device of Patent Document 2, only the rotation angle on the antenna parallel plane is detected as the posture. Further, in the apparatus of Patent Document 2, the rotation angle of the management target cannot be detected unless a plurality of antenna elements are arranged on substantially the same plane.

The device of Patent Document 3 is for identifying the position of a management object from information on a communication base station or GPS, and is a technique for specifying a position in a wide area. It is difficult to obtain detailed position information in a narrow area.

JP 2002-301264 A JP 2006-14110 A JP 2007-324945 A

The present invention has been made in view of the problems of the background art described above, and an object of the present invention is to provide an RFID system that can easily and accurately detect the position and posture of a card or other relatively small management target.

In order to achieve the above object, an RFID system according to the present invention enables a reader / writer that reads data of an RF tag attached to each of one or more management targets and a communication with the RF tag connected to the reader / writer. A plurality of RFID antennas and a management device that controls the reader / writer, and the RF tag includes a posture information detection unit that acquires posture information of the RF tag, a memory for storing posture information, and a tag control unit The tag control unit stores the posture information acquired by the posture information detection unit in a memory and requests from the reader / writer. The attitude information is read from the memory and sent to the reader / writer according to the Obtaining positional information about the arrangement of the RF tag from the RFID antenna to power the RF tag when reading the broadcast. Here, the posture information detection unit may include a sensor for detecting mechanical or magnetic information exerted on the RF tag, for example.

In the above RFID system, the tag control unit reads the posture information acquired by the posture information detection unit in response to a request from the reader / writer and transmits it to the reader / writer, so that it is attached to the position information obtained by a plurality of RFID antennas. Posture information can be obtained.

It is a block diagram explaining the RFID system concerning a 1st embodiment. It is a figure explaining the application to the card arrangement | positioning identification system of the system of FIG. It is a block diagram explaining the structure of the RF tag or card | curd which comprises the system of FIG. 4A and 4B are diagrams illustrating the arrangement of loop antennas. It is a figure explaining the loop antenna shown in FIG. 1, and its peripheral circuit. It is a figure explaining the modification of the system of FIG. It is a figure explaining another modification of the system of FIG. It is a figure explaining the RF tag or card | curd used for the RFID system which concerns on 2nd Embodiment.

[First Embodiment]
The RFID (Radio Frequency Identification) system according to the first embodiment of the present invention will be described below with reference to FIG.

The RFID system 100 shown in FIG. 1 is for specifying specific information, position information, rotation angle, and other attitude information of the management target 50. Among the antenna apparatus 10 for transmitting and receiving signals, An antenna switching device 20 that operates a specific loop antenna (RFID antenna), a reader / writer 30 that drives the antenna device 10, and a management device 80 that operates the reader / writer 30 to identify the arrangement of cards.

In the present embodiment, the management target 50 by the RFID system 100 is, for example, a rectangular card having a thin plate appearance. Each management object 50 has an RF tag 60 that is a wireless tag, and has a tag antenna 61 for communicating with the reader / writer 30 on the inner periphery, for example.

FIG. 2 illustrates an example in which the RFID system 100 of FIG. 1 is applied to a card arrangement identification system. The RFID system 100 detects the arrangement on the board surface 71 as position information for each of the plurality of

cards

50A, 50B, and 50C that are the management targets 50 placed on the board surface 71 of the case 70 containing the RFID system 100, A direction on 71 (for example, a rotation angle θ with respect to the y axis) is detected as posture information. The card arrangement identification system can be used, for example, as a game device. In this case, the board surface 71 becomes a play field, and a plurality of items such as cards and figures are arranged on the board surface 71 for use.

The structure of the RF tag 60 will be described with reference to FIG. The RF tag 60 is operated by electric power supplied from a loop antenna (RFID antenna) constituting the antenna device 10, and includes a tag antenna 61, an RF circuit 62, a memory 64, an attitude information detection unit 66, A tag control unit 68.

As shown in FIG. 1, the tag antenna 61 has an outline corresponding to, for example, the outer periphery of the management target 50 and is embedded in a state having symmetry with respect to the outline of the management target 50. The tag antenna 61 receives electric waves including a radio signal from the reader / writer 30 and generates electric power.

The RF circuit 62 demodulates data from the received radio wave, generates a radio signal from the data output from the tag control unit 68, and outputs it to the tag antenna 61. Although a detailed description is omitted, a power feeding circuit is provided along with the RF circuit 62, and the power received by the tag antenna 61 is received by the RF circuit 62, the memory 64, the attitude information detection unit 66, and the tag control unit. 68.

The memory 64 has a non-volatile memory and stores a program describing the operation of the RF tag 60. In the memory 64, unique ID information of the RF tag 60 is stored. The memory 64 can also store authentication data accompanying the unique ID information. Further, the memory 64 stores data for properly operating the RF circuit 62, the posture information detection unit 66, and the like, and posture information obtained by operating the posture information detection unit 66 can be stored. . The memory 64 can be set to read-only for specific information.

In the present embodiment, the posture information detection unit 66 includes a geomagnetic sensor 66a for detecting the azimuth angle or rotation angle of the RF tag 60 and a drive circuit 66b for the geomagnetic sensor 66a. The geomagnetic sensor 66a is composed of, for example, a combination of a plurality of Hall elements, and the drive circuit 66b determines the azimuth angle of the RF tag 60 using the detection output of the geomagnetic sensor 66a. The posture information detection unit 66 outputs the detected azimuth angle to the tag control unit 68 as digital data or analog data.

The tag control unit 68 is a logic circuit that comprehensively controls the operations of the tag antenna 61, the RF circuit 62, the memory 64, and the attitude information detection unit 66. The tag control unit 68 operates according to a command received from the reader / writer 30 via the tag antenna 61 and the RF circuit 62, and includes, for example, unique ID information and attitude information (specifically, azimuth angle) stored in the memory 64. Various response processes such as transmitting data to the reader / writer 30 via the tag antenna 61 or the like are performed.

In particular, the tag control unit 68 of the present embodiment, in response to a request from the reader / writer 30, not only the unique ID information and other unique information, but also the azimuth angle of the RF tag 60 obtained by operating the posture information detection unit 66, that is, The azimuth angle of the management target 50 is transmitted to the reader / writer 30 via the RF circuit 62 and the tag antenna 61.

As described above, the tag control unit 68 is obtained by operating the attitude information detection unit with the electric power obtained from the electromagnetic wave received from any one or more of the plurality of loop antennas (RFID antennas) constituting the antenna device 10. The attitude information stored is stored in the memory 64, and when the electromagnetic wave includes a control signal for requesting reading of the attitude information, the attitude information stored in the memory 64 is transmitted to the reader / writer 30. In the above case, the RF tag 60 including the attitude information detection unit 66 can be operated only with the power supplied from the loop antenna (RFID antenna), and the RF tag 60 without a power source can function as an attitude sensor. It is possible.

Referring back to FIG. 1, the antenna device 10 includes a first antenna unit 11 for the x direction and a second antenna unit 12 for the y direction.

The first antenna unit 11 extends in the horizontal x direction, which is the first direction, and is, for example, equally spaced in the vertical y direction, which is the second direction intersecting in a state orthogonal to the first direction. A plurality of first loop antennas (RFID antennas) 13 arranged at intervals, and a plurality of matching circuits 14 provided in association with the first loop antennas 13 are provided. In the specific example, the first loop antenna 13 includes n (n is a natural number) first loop antennas R1 to R5,... Rn, and the matching circuit 14 includes n matching circuits MR1 to MR5,. .

As schematically shown in FIG. 4A, the first loop antennas R1 to Rn of the first antenna unit 11 are individually connected to the matching circuits MR1 to MRn, respectively. The first loop antennas R1 to Rn form a first antenna surface AP1 having a two-dimensional extent as a whole in the x and y directions. The interval between the central axes of the first loop antennas R1 to Rn is substantially equal to the arrangement interval SR1 of the first loop antennas R1 to Rn.

As schematically shown in FIG. 5, the first antenna unit 11 is disposed between the first loop antennas R1 to Rn and the matching circuits MR1 to MRn to individually short-circuit the first loop antennas R1 to Rn. It further has a switch circuit 18 capable of

Returning to FIG. 1, the second antenna unit 12 extends in the vertical y direction, which is the second direction, and has a plurality of second antenna units arranged at equal intervals or other predetermined intervals in the horizontal x direction, which is the first direction. A two-loop antenna (RFID antenna) 15 and a plurality of matching circuits 16 provided along with the second loop antenna 15 are provided. In the specific example, the second loop antenna 15 includes n second loop antennas C1 to C5,... Cn, and the matching circuit 16 also includes n matching circuits MC1 to MC5,.

Note that the number of second loop antennas (RFID antennas) 15 constituting the second antenna unit 12 is different from the number of first loop antennas (RFID antennas) 13 constituting the first antenna unit 11. Also good.

As schematically shown in FIG. 4B, the second loop antennas C1 to Cn of the second antenna unit 12 are individually connected to the matching circuits MC1 to MCn, respectively. The second loop antennas C1 to Cn form a second antenna surface AP2 having a two-dimensional extent as a whole in the x and y directions. The second antenna surface AP2 overlaps with the first antenna surface AP1 and has a substantially equal area. The interval between the central axes of the second loop antennas C1 to Cn is substantially equal to the arrangement interval SC1 of the second loop antennas C1 to Cn. In the specific example, the arrangement interval SC1 of the second loop antennas C1 to Cn is substantially equal to the arrangement interval SR1 of the first loop antennas R1 to Rn, but the arrangement intervals SC1 and SR1 may be different. . The loop width Wc of the second loop antennas C1 to Cn is substantially equal to the loop width Wr of the first loop antennas R1 to Rn, but the loop widths Wr and Wc may be different.

In the above case, the position information of the RF tag 60 (or the management target 50 attached thereto) can be obtained as the position where the first loop antennas R1 to Rn and the second loop antennas C1 to Cn intersect. That is, position information can be obtained with a small number of antennas.

Returning to FIG. 1, although not shown, the second antenna unit 12 is disposed between the second loop antennas C1 to Cn and the matching circuits MC1 to MCn and individually short-circuits the second loop antennas C1 to Cn. It further has a switch circuit that can do this. The switch circuit of the second antenna unit 12 has the same structure as the switch circuit 18 of the first antenna unit 11.

The antenna switching device 20 operates based on a control signal from the reader / writer 30 and operates by cyclically selecting one of the first loop antennas R1 to Rn and the second loop antennas C1 to Cn. . At this time, the antenna switching device 20 causes the switch circuit 18 of FIG. 5 to short-circuit the loop antenna that is not selected and is not operated among the first loop antennas R1 to Rn and the second loop antennas C1 to Cn. That is, when the reader / writer 30 selects any one of the loop antennas R1 to Rn and C1 to Cn as an antenna for reading RF tag data from the management target 50, the switch connected to the loop antenna is selected. When the circuit 18 is opened, the circuit 18 functions as a resonant antenna. On the other hand, when the reader / writer 30 does not select any of the loop antennas R1 to Rn and C1 to Cn as the antenna for reading the data of the RF tag from the management target 50, the switch circuit connected to the loop antenna. When 18 is short-circuited, it does not function as a resonant antenna. As a result, the characteristics of the selected loop antenna can be prevented from being influenced by other loop antennas, the resonance frequency of the other loop antenna can be shifted, and data can be read from the RF tag of the management target 50 The accuracy of the position information obtained from the result can be increased. As described above, the RFID system 100 includes the antenna switching device 20 that selectively connects the first loop antennas R1 to Rn and the second loop antennas C1 to Cn as a plurality of RFID antennas to the reader / writer 30. It is possible to specify which of the antennas R1 to Rn and C1 to Cn supplies power to the RF tag, and the position information can be obtained over a wide range by a single reader / writer 30. Further, the RFID system 100 includes the switch circuit 18 that can short-circuit each of the loop antennas R1 to Rn and C1 to Cn, so that the loop antenna selected by the antenna switching device 20 and the loop antenna that is not selected Between the RF tag 60 and the two loop antennas can be prevented from interfering with each other.

As shown in FIG. 6, the antenna switching device 20 can be individually provided for the first loop antennas R1 to Rn and the second loop antennas C1 to Cn. In this case, each antenna switching device 20 has a reader / writer 30. Can be provided. Further, the first loop antennas R1 to Rn can be divided into small groups, and the antenna switching device 20 and the reader / writer 30 can be provided for each group. Further, as shown in FIG. 7, a plurality of types of reader / writers 30 can be operated by the management device 80. In this case, while one loop antenna 118 is directly operated by one reader / writer 30, a plurality of loop antennas 118 connected to the antenna switching device 20 via one or more antenna switching devices 20 by another reader / writer 30. Can be operated while switching. 7 corresponds to the loop antennas R1 to Rn, C1 to Cn and the matching

circuits

14 and 16 of FIG. 1, and by specifying the loop antenna 118, the RF tag 60 that detects m as a natural number. Position information on the board surface 71 can be acquired for -1 to 60-m (that is, management targets 50-1 to 50-m). Further, from each of the RF tags 60-1 to 60-m, the posture information of the management targets 50-1 to 50-m can be acquired together with the unique information for specifying the management targets 50-1 to 50-m.

The reader / writer 30 shown in FIG. 1 includes a transmission circuit that generates a transmission signal, a reception circuit that receives and decodes the reception signal, and a control circuit that controls the operation of the reader / writer 30, although detailed description is omitted. . Of these, the control circuit outputs a control signal to the antenna switching device 20 and the switch circuit 18, thereby selecting any one of the loop antennas R1 to Rn and C1 to Cn to perform the detection operation. . The reader / writer 30 extracts tag information such as the unique ID information of the RF tag in the management target 50 from the received signal detected by the selected loop antenna, and is selected in association with the unique ID information (tag information). The numbers (antenna information) of the loop antennas R1 to Rn and C1 to Cn are acquired.

The management device 80 controls the operation of the reader / writer 30. The tag information such as the unique ID information of the RF tag 60 read by the reader / writer 30, that is, the management target 50, and the loop selected and used for reading at that time The antenna information such as the numbers of the antennas R1 to Rn and C1 to Cn is stored in association with each other. Here, a plurality of pieces of antenna information stored in association with one RF tag 60, that is, combinations of numbers of the loop antennas R1 to Rn and C1 to Cn give the intersection of the

antennas

13 and 15, and the position of the RF tag 60 It is equivalent to information. That is, the management device 80 stores the position information of the management target 50 together with the tag information that specifies the management target 50. This position information indicates a discrete position on the board surface 71 of the RF tag 60, that is, the management target 50, and the arrangement interval SR1 of the first loop antennas R1 to Rn and the arrangement of the second loop antennas C1 to Cn in the xy coordinates. This represents a point or grid on the grid having the interval SC1 as the minimum unit. Further, the management device 80 stores the azimuth angle of the RF tag 60 that is read together with the unique ID information of the management target 50, that is, the azimuth angle of the management target 50 in association with the position information. That is, together with the unique ID information (unique information) of the management target 50, the posture information that is the azimuth angle of the management target 50 and the position information that is the discrete xy coordinate position are stored in the storage unit 81. That is, the management device 80 can detect a plurality of pieces of antenna information associated with one RF tag 60 based on various data or information notified from the reader / writer 30, and thereby, the one RF tag 60. It is possible to calculate the intersection of the antennas in which there is. At this time, if the azimuth angle of the board surface 71 is known or can be detected, specifically, for example, if a sensor for detecting the azimuth angle is built in the case 70, the management device 80 can manage the management object 50 or The azimuth angle as the posture information of the RF tag 60 can be converted into a rotation angle around the z-axis with respect to the y-axis on the board surface 71, for example, and stored and managed in the storage unit 81. Furthermore, the management device 80 can record the position information and posture information of the management target 50 or the RF tag 60 together with the time. In this case, the movement and posture trajectory of the management target 50 can be recorded and analyzed.

In the RFID system 100 of the first embodiment described above, the tag control unit 68 reads the posture information acquired by the posture information detection unit 66 in response to a request from the reader / writer 30, and transmits it to the reader / writer 30. It is possible to obtain posture information related to azimuth or rotation by attaching to position information obtained by a plurality of loop antennas (RFID antennas) R1 to Rn, C1 to Cn. Further, since the RF tag 60 is not equipped with a battery or a GPS position detection device, a position and orientation detection system can be constructed more easily and at a lower cost than a similar system using a smartphone, a beacon or the like.

[Second Embodiment]
Hereinafter, an RFID system according to the second embodiment will be described. The RFID system according to the second embodiment is a modification of the first embodiment, and parts that are not particularly described are the same as those of the first embodiment. In the case of the second embodiment, the management target 50 is not limited to a card shape, and for example, a three-dimensional shape can be used to change the tilt state.

As shown in FIG. 8, the RF tag 60 constituting the RFID system of the second embodiment includes an acceleration sensor 66c for detecting the inclination of the RF tag 60 in the attitude information detection unit 66, and a drive circuit for the acceleration sensor 66c. 66d. The acceleration sensor 66c is composed of, for example, a MEMS acceleration sensor, and the drive circuit 66d determines the tilt angle of the RF tag 60 (for example, the tilt angle of the RF tag 60 based on how gravity acceleration is received) using the detection output of the acceleration sensor 66c. To do. The posture information detection unit 66 outputs the detected inclination angle to the tag control unit 68 as digital data or analog data. Note that the inclination angle is not limited to a simple amount of inclination, and may be an angle inclination direction with respect to the RF tag 60 as a reference. Summarizing the attitude information detection unit 66, in the above case, the attitude information detection unit 66 determines not only the orientation of the RF tag 60 (management object 50) but also the orientation or rotation and inclination of the RF tag 60 (management object 50). Can be detected. In addition, the three-dimensional posture of the RF tag 60 (management target 50) can be managed.

As a result, the management device 80 collectively manages the azimuth angle and the inclination angle as the posture information of the management target 50 or the RF tag 60.

In the case of the present embodiment, it is possible to obtain not only attitude information related to the orientation or rotation of the management target 50 but also attitude information related to the inclination of the management target 50 by being attached to the position information. That is, the posture information obtained in the present embodiment is three-dimensional rotational posture information. In addition, when the management target 50 is card-shaped, the posture information on the front and back sides can be acquired together with the posture information regarding the azimuth or rotation by the RFID system of the present embodiment.

Although the present invention has been described above according to the embodiment, the present invention is not limited to the above embodiment.

For example, in the above-described embodiment, the outline shape of the antenna surfaces AP1 and AP2 of the

antenna units

11 and 12 is a quadrangle, but is not limited thereto, and can be various shapes.

Also, not all the position information and posture information of the management target 50 can be detected, but only the posture information of the management target 50 can be detected, for example.

As described above, the arrangement interval SR1 of the first loop antennas R1 to Rn and the arrangement interval SC1 of the second loop antennas C1 to Cn can be matched or different from each other, but the first loop antenna R1 The arrangement intervals of the loop antennas 13 may be different in Rn. Similarly, the arrangement intervals of the loop antennas 15 may be different in the second loop antennas C1 to Cn. Furthermore, the loop widths of the

loop antennas

13 and 15 may be different from each other in the first loop antennas R1 to Rn and the second loop antennas C1 to Cn.

In the above, it is assumed that one RF tag 60 exists in the intersection area between one loop antenna 13 of the first loop antennas R1 to Rn and one loop antenna 15 of the second loop antennas C1 to Cn. However, a plurality of RF tags 60 may exist in one of such intersection areas. In this case, information of a plurality of RF tags 60 arranged in one intersection area, that is, information of a plurality of cards is identified.

In the above, it is assumed that one RF tag 60 is incorporated into one management target 50, but a plurality of RF tags 60 may be incorporated into one management target 50.

In the above description, it is assumed that the reader / writer 30 obtains antenna information and transmits it to the management device 80. However, the management device 80 can specify the antenna information. Specifically, the management device 80 transmits an antenna switching command including an antenna number to the reader / writer 30 in order to designate an antenna to be read. The reader / writer 30 selects the loop antenna designated by the antenna number. The management device 80 transmits a read command to the reader / writer 30. The reader / writer 30 performs a reading process and transmits only data obtained from the RF tag 60 (hereinafter also referred to as tag data) to the management device 80. Since the management apparatus 80 knows the antenna number designated by itself, the management apparatus 80 manages the antenna number in association with the tag data acquired accordingly. That is, in the above case, the antenna information is obtained by designating the loop antenna on the management device 80 side, and the intersection of the antennas is calculated.

Claims

A reader / writer that reads data from RF tags attached to one or more management targets,
A plurality of RFID antennas connected to the reader / writer to enable communication with the RF tag;
A management device for controlling the reader / writer,
The RF tag includes a posture information detection unit that acquires posture information of the RF tag, a memory for storing the posture information, and a tag control unit, and any one or more of the plurality of RFID antennas Operated by the power supplied from
The tag control unit stores the posture information acquired by the posture information detection unit in the memory, reads the posture information from the memory in response to a request from the reader / writer, and transmits the posture information to the reader / writer.
An RFID system in which the management device obtains position information related to an arrangement of the RF tag from an RFID antenna that supplies power to the RF tag when posture information is read from the memory.
The RFID system according to claim 1, wherein the posture information detection unit detects the orientation or rotation and tilt of the RF tag as posture information.
The RFID system according to claim 1, further comprising an antenna switching device that selectively connects the plurality of RFID antennas to the reader / writer.
The tag control unit stores posture information acquired by operating the posture information detection unit using power obtained from electromagnetic waves received from any one or more of the plurality of RFID antennas in the memory, and stores the electromagnetic waves. 2. The RFID system according to claim 1, wherein when the control signal for requesting the readout of the posture information is included, the posture information stored in the memory is transmitted to the reader / writer.
A first antenna unit and a second antenna unit;
The first antenna unit includes, as the plurality of RFID antennas, a plurality of first loop antennas that extend in a first direction and are arranged at predetermined intervals in a second direction that intersects the first direction. 1 antenna surface,
The second antenna unit has a plurality of second loop antennas extending in the second direction and arranged at a predetermined interval in the first direction as the plurality of RFID antennas, and forms a second antenna surface. And
The RFID system according to claim 1, wherein the first antenna surface and the second antenna surface overlap each other.
The reader / writer reads RF tag data while distinguishing the plurality of first and second loop antennas of the first and second antenna units, and specifies antenna information and RF for identifying the loop antenna that can be read. Informing the management device in combination with the tag data,
The management device calculates the intersection of antennas based on the plurality of antenna information notified from the reader / writer and tag information specifying the RF tag obtained from the data, and the position of the RF tag from which the data was obtained 6. The RFID system according to claim 5, wherein information is obtained.
The reader / writer reads the RF tag data from the first and second loop antennas of the first and second antenna units by using a loop antenna designated by the management device and notifies the management device of the data.
The management device calculates antenna intersections based on antenna information designated for the reader / writer and tag information for identifying an RF tag obtained from the data notified from the reader / writer, and obtained data The RFID system according to claim 5, wherein position information of the RF tag is obtained.
An antenna switching device for selectively connecting the plurality of RFID antennas to the reader / writer;
The RFID system according to claim 1, wherein each RFID antenna includes a loop antenna, a matching circuit provided in association with the loop antenna, and a switch circuit capable of short-circuiting the loop antenna.
The RFID system according to claim 1, wherein a geomagnetic sensor for detecting an azimuth angle or a rotation angle of the RF tag is incorporated as the posture information detection unit.
The RFID system according to claim 1, wherein an acceleration sensor that detects an inclination of the RF tag is incorporated as the posture information detection unit.