JP2008294863A - Radio tag system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a radio tag system, whose detecting area is expanded and the result of detection is transmitted to a monitoring center, by only arraying continuously several pieces of comparatively small-sized magnetic field loop antenna without connecting a large-sized antenna to a transmitting-receiving circuit unit. <P>SOLUTION: Mats 32, accommodating magnetic field antenna, are arrayed so as to be neighbored and when the radio tag is approached to either one of these magnetic field loop accommodating mats, respective mats transmit a magnetic field energy one after another whereby the detecting area is expanded even if a large-sized antenna or an expensive radio tag reader-writer is not employed and the detecting information is transmitted to the server 37 of the monitoring center by the radio tag reader-writer 30. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wireless tag system that can expand a detection area of a wireless tag without cost even with a relatively small magnetic field loop antenna, and a monitoring center can easily use this detection information.

  FIG. 14 is a schematic configuration diagram of a conventional active wireless tag transmission / reception system.

  As shown in FIG. 14, the wireless tag reader / writer 10 has an integrated configuration in which a transmission / reception circuit unit 11 and a transmission / reception antenna unit 13 are connected by a feeder 12.

  The transmission / reception antenna unit 13 includes a magnetic field loop antenna. When the active wireless tag 20 is brought close to the transmission / reception antenna unit 13, the transmission / reception antenna unit 13 (including the magnetic field loop coil) receives the ID signal from the wireless tag 20. This received signal was sent to the transmission / reception circuit unit 11 of the wireless tag reader / writer 10 via the feeder 12.

  On the other hand, a passive wireless tag transmission / reception system (not shown) transmits a radio wave for supplying power from a radio tag reader / writer to a passive radio tag, and the passive radio tag receives this radio wave and converts it into DC power. The ID is converted and transmitted to the RFID tag reader / writer using this as a power source.

Further, since the passive type has a limitation on the radio signal power that can be output from the wireless tag reader / writer due to limitations of the Radio Law, the distance between the wireless tag reader / writer and the wireless tag is limited to several centimeters. Therefore, when performing detection in a wide area, it is necessary to install a number of expensive RFID tag readers / writers (devices in which the transmission / reception circuit unit, transmission / reception antenna unit, and feed line are integrated). However, it was forced to construct a system with a large cost and scale.
JP 2000-113127 A

  In general, the transmission output of a wireless tag reader / writer is restricted by regulations of the Radio Law. Currently, the wireless tag that is widely spread is the ISO 14443 or ISO 15693 type wireless tag using 13.56 MHz.

  These RFID tag readers / writers have an integrated structure in which a transmission / reception circuit unit and a transmission / reception antenna unit are connected to each other by a feeder line.

  A typical example is an automatic ticket gate at a station. This automatic ticket checker has a detection error unless the wireless tag is accurately placed at a designated location of about 10 × 5 cm, and as a result, it is not recognized correctly and cannot pass through the ticket checker.

  In addition, even in an entrance / exit security system for a building or the like, it is not detected correctly unless the wireless tag is accurately brought at a designated position of several centimeters relative to the front face of the card reader at the doorway. As a result, the door cannot be opened.

  In order to solve these problems, if it is intended to give a wider tolerance to the position of the wireless tag, it is necessary to arrange a plurality of wireless tag readers / writers side by side. As the cost becomes high.

  On the other hand, if a large antenna that covers a wide area is connected to a wireless tag reader / writer to solve this problem, a wireless tag with a short reading distance can cover a wide area. That is, if a large antenna is connected, a wireless tag can be detected without requiring high positional accuracy.

  However, in this case, it is necessary to design and manufacture an antenna that adapts to various field installation conditions for each system application, which requires cost and effort for realizing the antenna.

  The present application has been made to solve the above problems, and by simply arranging a number of relatively small magnetic loop antennas continuously without connecting a large antenna to the transmission / reception circuit unit, the detection area of the wireless tag An object is to obtain a wireless tag system that transmits the detection result to a monitoring center.

The wireless tag system of the present invention is a wireless transmission / reception system comprising a passive type wireless tag attached to a mobile body, a wireless tag reader / writer, and a magnetic field antenna built-in medium incorporating a magnetic loop antenna. A wireless tag system in which a computer system of a monitoring center is connected to a writer via a communication network,
The magnetic field antenna built-in medium has a magnetic field loop coil and a capacitor without including a link coil and is covered with a rectangular medium,
A magnetic field antenna medium group in which a plurality of magnetic field antenna built-in media are arranged adjacent to each other in a non-contact manner at intervals within a certain distance; and
The wireless tag reader / writer is
A transmission / reception antenna unit having a magnetic field loop coil having the same size as the magnetic field loop coil of the wireless tag, a capacitor, and a link coil having a shorter loop length than the magnetic field loop coil;
A feeder connected to the link coil of the transmitting / receiving antenna unit;
A transmission / reception circuit unit that is connected to the power supply line, adds a wireless tag reader / writer number to the detection signal of the wireless tag detected by the link coil, and transmits this to the computer system of the monitoring center as wireless tag detection information; The wireless tag reader / writer is arranged adjacent to any one of the magnetic field antenna media in the magnetic field antenna medium group.

This is the gist.

  As described above, according to the wireless tag system of the present invention, a magnetic loop antenna having a predetermined size (for example, A4 size) (external unconnected magnetic loop antenna) is not physically connected to the wireless tag reader / writer. Are also installed in parallel to inductively couple electromagnetic waves and energy from the antenna of the transmitting / receiving unit antenna unit inside the RFID tag reader / writer.

  That is, even if this large antenna is not installed, the detection area of the wireless tag can be expanded by arranging a plurality of external non-connection magnetic field loop antennas.

  Moreover, the same external unconnected magnetic loop antenna can be used, so if the same standard products are mass-produced, it is extremely low-cost simply by arranging them in an area suitable for the installation environment of any shape. Wireless tag detection can be made possible.

  According to the wireless tag system of the present invention, the detection area can be expanded without modifying the wireless tag reader / writer for ISO 15693 and ISO 14443 type wireless tags that are widely mass-produced as global standards.

  Moreover, the newly added equipment does not require any power supply or the like, and is a magnetic loop antenna composed of passive electronic components such as a coil and a capacitor, so it is extremely excellent in cost, reliability, and economy. .

  The system construction method is also very easy to use and easy to use because the magnetic field loop antenna is simply placed in the immediate vicinity of the RFID tag reader / writer.

  Furthermore, with regard to the degree of freedom of installation, only the required number of detection areas can be arranged, so if mass-produced magnetic loop antennas with the same specifications are mass-produced, the required number can be flexibly adapted to the installation environment. Just use it.

  For this reason, it is possible to realize detection in a wide range using a 13.56 MHz type wireless tag, which has been difficult to realize in the past, and it is possible to significantly expand the application usage range of the wireless tag.

  As an example, taking entrance / exit management at a building entrance / exit as an example, a plurality of magnetic field loop antennas are arranged on a mat on the floor surface.

  If a wireless tag is installed on the back of a visitor's shoes, the wireless tag can be detected unconsciously. For example, there are restrictions on the safety of exposure to electromagnetic fields to hospitals and nursing care facilities where radio wave use is severely restricted. Can be introduced without receiving.

<Embodiment 1>
FIG. 1 is a schematic configuration diagram of the wireless tag system according to the first embodiment. FIG. 2 is an explanatory diagram for explaining the magnetic antenna built-in mat according to the first embodiment. In this Embodiment 1, the case where the system of this Embodiment is applied in a hospital is demonstrated.

  As shown in FIG. 1, mats 32 (for example, A4 size) with built-in magnetic field antennas are arranged adjacent to each other. In this embodiment, they are arranged at the entrance of the room A.

  A wireless tag reader / writer 30 is provided on the right side of the entrance. A wireless tag 36 is attached to the bottom of the slipper 35 worn by the patient A in the room.

  Further, the wireless tag reader / writer 30 is connected to a LAN for transmitting signals to the monitoring center. The wireless tag reader / writer 30 monitors the outing detection information Ji obtained by adding the number of the wireless tag reader / writer 30 to the ID code received from the mat 32 with a built-in magnetic field loop coil (referred to as a magnetic antenna built-in mat 32). Send to. The plurality of magnetic field antenna-containing mats 32 are collectively referred to as a magnetic field antenna-containing mat group.

  The above-described monitoring center includes a server 37 and a personal computer 38. The server 37 includes a walking information writing means 41, a timer 42, a database 43 storing patient ID codes that should not be left from the room, a database 44 for walking person information, a data output means 45, It consists of a database 46 or the like that stores hospital layout diagrams.

  The outing information writing means 41 receives the outing detection information Ji from the wireless tag reader / writer 30 and is compared with the ID code of the outing detection information Ji and the ID code of the database 43 to prohibit outing. Determine if it is the patient's ID code. In the case of a patient whose walking is prohibited, the date and time (in seconds) of the timer 42 are written in the database 44.

  In this database 44, as shown in FIG. 3, time, ID code, name, age, disease name, person in charge (name of doctor in charge, name of nurse in charge), etc. corresponding to room numbers (A, B,...) A managed trip management table is generated.

  The data output means 45 causes the personal computer 38 to display the outing management table generated in the database 44. Further, a layout diagram (monitoring diagram data) of the floor in the hospital including the room number is retrieved from the database 46 (see FIG. 4) and displayed on the personal computer 38. The mats with built-in magnetic field antennas in this layout diagram are also displayed, and the mats with built-in magnetic field antennas in front of the room where the wireless tag 20 of the slipper 35 is detected are displayed by color. As a result, at the monitoring center, when a person who should not leave the room leaves the room, it can be known at a glance who has left the room and when.

  Here, the relationship among the mat group with built-in magnetic field antenna, the wireless tag reader / writer 30 and the wireless tag 36 built in the slipper 35 will be described with reference to FIG.

  As shown in FIG. 2, the magnetic antenna built-in mat 32 includes a magnetic loop antenna 32a and a capacitor 32b that resonate at the same frequency f as the frequency 13.56 MHz used in the RFID tag reader / writer 30. It is put in a plastic case and covered with cloth. The magnetic field loop antenna 32a is an antenna in which elements (conductive wires, conductive wire patterns) are annular (loop).

The aforementioned frequency f is

As obtained.

  Then, the mats with built-in magnetic field antennas 32 in which the mats with built-in magnetic field antennas 32 are arranged in parallel in front of the room A (adjacent spacing is preferably within 5 mm) are formed.

  The transmission / reception antenna unit 30a of the RFID tag reader / writer 30 includes a magnetic field loop antenna 30b, a capacitor 30c, and a link coil 30d. The link coil 30d is made of glass epoxy resin or the like so as not to contact the magnetic field loop antenna 30a. It is fixed with. Further, the link coil 30d is connected to the transmission / reception circuit unit 30e by a feeder line 30f.

  The reception signal obtained by the link coil 30d is output to the transmission / reception circuit unit 30e.

  The transmission / reception circuit unit 30e adds a preset number of the wireless tag reader / writer 30 to the reception signal (including the ID code), and transmits this to the monitoring center as wireless tag detection information.

  That is, when the patient A puts on the slipper 35 and leaves the room A, the slipper 35 steps on any one of the magnetic antenna built-in mats 32 in the magnetic antenna built-in mat group. Since the slipper 35 has a built-in wireless tag 36, a current flows through the magnetic field loop antenna 32a in the magnetic antenna built-in mat 32 when the wireless tag 36 approaches. Then, magnetic field energy is generated by the magnetic field loop antennas 32a in the adjacent magnetic field antenna-containing mats 32 one after another. As a result, the transmission / reception antenna unit 30a of the wireless tag reader / writer 30 resonates at the frequency f and is detected (including the ID code) by the link coil 30d.

  Therefore, according to the wireless tag system of the first embodiment, the detection area can be set without modifying the wireless tag reader / writer for ISO15693 and ISO14443 type wireless tags that are widely mass-produced as global standards. Can be spread.

  Further, since the magnetic field antenna built-in mat 32 having a size of about A4 size may be simply arranged adjacent to each other, no construction for expanding the detection area is required.

  Moreover, the newly added equipment does not require any power supply or the like, and is a magnetic loop antenna composed of passive electronic components such as a coil and a capacitor, so it is extremely excellent in cost, reliability, and economy. .

  As for the degree of freedom of installation, only the required number of detection areas can be arranged, so if mass-produced magnetic loop antennas with the same specifications are mass-produced, only the required number can be flexibly supported by the installation environment. Use it.

  For this reason, it is possible to realize detection in a wide range using a 13.56 MHz type wireless tag, which has been difficult to realize in the past, and it is possible to significantly expand the application usage range of the wireless tag.

<Embodiment 2>
FIG. 5 is a schematic configuration diagram of the wireless tag system according to the second embodiment. In FIG. 5, a wireless tag reader / writer 30, a mat group with a built-in magnetic field antenna, and a slipper 35 are shown.

  In the second embodiment, if too many magnetic antenna antenna-containing mats 32 are arranged in parallel, the transmitted energy may be reduced.

For this reason, for example, when there are about six sheets, a new power supply line 48 is provided by branching the power supply line 30f inside the wireless tag reader / writer 30, and this power supply line 48 is connected to the sixth mat with a built-in magnetic field antenna. 49.

  As shown in FIG. 5, the magnetic antenna built-in mat 49 includes a magnetic loop antenna 49a, a capacitor 49b, and a link coil 49c. The link coil 49c is made of glass epoxy resin or the like so as not to contact the magnetic loop antenna 49a. It is fixed with. The feeder 48 outputs the reception signal obtained by the link coil 49c to the transmission / reception circuit unit 30e, and the transmission / reception circuit unit 30e adds a preset number to the reception signal (including the ID code) to the monitoring center. Send.

  Therefore, even if a large number of mats with built-in magnetic field antennas are arranged in parallel, it is possible to detect the exit from the room A.

<Embodiment 3>
FIG. 6 is a configuration diagram in the case where the wireless tag system of the present embodiment is used for school management of elementary school children and kindergarten children.

  As shown in FIG. 6, a wireless tag 36 is attached to the soles of elementary school children and kindergarten children. A mat 32 with a built-in magnetic field antenna is arranged in the school gate. Then, the RFID tag reader / writer 30 is provided close to the magnetic field antenna-incorporating mat 32 at the end of the magnetic antenna antenna-incorporating mat group (gate or school building entrance). The wireless tag reader / writer 30 and the school server 60 b are connected by a dedicated cable 62. A monitoring personal computer 60a (for example, a teacher's personal computer) is connected. The server 60b is provided in the school from the viewpoint of security.

  Thus, when an elementary school student or a kindergarten child (hereinafter referred to as schoolchild) steps on the magnetic field antenna-containing mat 32 with shoes, the magnetic field antenna-containing mats 32 are arranged adjacent to each other as in the first and second embodiments. Is detected by the wireless tag reader / writer 30, and the received signal is transmitted to the server 60b of the monitoring center.

  The personal computer 60a in the monitoring center accesses the server 60b and displays the ID, name, and time of the received signal on the screen. For this reason, when the teacher makes an inquiry from the parent's mobile phone 61, the teacher can notify the time when the inquiry is made.

Further, when the server 60b accepts access from the guardian's mobile phone 61 or when automatic distribution is performed, the server 60b has access from the mobile phone 61 when the pre-registered school time is reached or And the information having the ID code linked to the guardian code is transmitted. In addition, the above-mentioned magnetic loop-incorporated mat group is arranged at the intersection of the responsible area and the server 60b stores the map of the responsible area. When the vehicle passes through the intersection on the map, it may be displayed by color so that it is informed of where it is now (see FIG. 8).

  FIG. 7 is a sequence diagram for explaining the operation of the wireless tag system according to the third embodiment.

  For example, when a schoolchild wearing a zock with a wireless tag leaves the school building, he steps on one of the mats 32 of the magnetic antenna built-in mats arranged in the school gate.

  As a result, the magnetic field antenna built-in mats transmit the magnetic field energy one after another and are received by the wireless tag reader / writer 30.

  The wireless tag reader / writer 30 adds the position number of the mat group with a built-in magnetic field antenna to the received signal and transmits it to the monitoring center (d1).

  The monitoring center server 60b adds time to the wireless tag detection information and stores it in the database 70 (d2).

  Then, when the schoolchild goes further and, for example, comes to the intersection A and steps on one of the mats in the group of mats with built-in magnetic antennas, each of the mats with built-in magnetic antennas transmits the magnetic field energy one after another and is provided at the intersection A Received by the wireless tag reader / writer 30. The wireless tag reader / writer 30 adds the number of the wireless tag reader / writer 30 close to the group of mats with a built-in magnetic field antenna to the received signal and transmits it to the monitoring center (d3).

  The monitoring center server 60b adds time to the RFID tag detection information and stores it in the database 70 (d4).

  When a schoolchild arrives at the intersection B and steps on one of the mats in the magnetic antenna built-in mat group, each magnetic antenna built-in mat transmits the magnetic field energy one after another and the line tag reader / writer 30 provided at the intersection B. Received by. The wireless tag reader / writer 30 at the intersection B adds the number (B) of the wireless tag reader / writer 30 of the magnetic antenna built-in mat group to the received signal and transmits it to the monitoring center (d5).

  The monitoring center server 60b adds time to the wireless tag detection information and stores it in the database 70 (d6).

  When a schoolchild arrives at the intersection C and steps on one of the mats of the magnetic antenna built-in mat group, each magnetic antenna built-in mat transmits the magnetic field energy one after another and the line tag reader / writer 30 provided at the intersection C. Received by. The wireless tag reader / writer 30 at the intersection C adds the number (C) to the wireless tag detection information number of the wireless tag reader / writer 30 and transmits it to the monitoring center (d7).

  The monitoring center server 60b adds time to the RFID tag detection information number and stores it in the database 70 (d8).

  When there is access (with accessor ID, schoolchild's name or ID code) from the guardian's mobile phone 61 or the teacher's personal computer 60a (d9), the server 60b provides a map of the database 71 and the database The RFID tag detection information having the ID code of the schoolchild stored in is read, and as shown in FIG. 8, the magnetic field antenna built-in mat group on the map corresponding to the RFID tag detection information number is displayed in blue, for example. And the time are displayed in the vicinity (d10).

  Thereby, the teacher or the guardian can grasp where the schoolchild is.

<Embodiment 4>
Since the system configuration of the fourth embodiment is the same as that of the first, second, and third embodiments, the description of the system configuration is omitted.

  FIG. 9 is an explanatory diagram for explaining the fourth embodiment. In the present embodiment, for example, as shown in FIG. 9 (a), a large wireless tag is attached to the back of the garbage truck, and a magnetic loop built-in mat is arranged at the gate of the incinerator as shown in FIG. 9 (b). This is an example of managing entry and exit of a garbage truck into an incinerator.

  When the garbage truck arrives at the gate of the incinerator, a wireless tag is attached to the back of the garbage truck, so each mat with a magnetic field antenna transmits magnetic energy and is received by the wireless tag reader / writer 30. The

  A gate number is added to the received signal and transmitted to the monitoring center. The server of the monitoring center adds the date and time and stores it in a database (not shown) as shown in FIG. 10 in association with the gate number.

In FIG. 10, the ID code of the radio tag of the garbage truck, the car number, the weight, the date, the time company name, and the number of times of entry and exit are associated with the gate number.

  Therefore, the monitoring center does not have to assign a person in charge of entering and exiting each gate, so that expenses can be saved.

<Embodiment 5>
The fifth embodiment is a case where the mat with a magnetic field loop has a function of notifying the mat number when a wireless tag is detected.

  FIG. 11 is a schematic configuration diagram of the wireless tag system according to the fifth embodiment. In the present embodiment, a hospital will be described as an example as in the first embodiment. Description of the same parts as those in the first embodiment is omitted.

  As shown in FIG. 11, mats 52 (for example, A4 size) with built-in magnetic field antennas are arranged adjacent to each other. In the present embodiment, the magnetic field antenna-containing mats 52 group arranged at the entrance of the room A is referred to as an entrance-side mat group 52a. Further, the left-side mat group 52b is a group of mats 52 with a built-in magnetic field antenna on the left side as viewed from the entrance of the room. Furthermore, the magnetic field antenna-containing mats 52 group arranged on the right side is referred to as a right mat group 52c.

  The server 37 of the above-described monitoring center includes a walking information writing means 50, a timer 42, a database 43 that stores a patient ID code that should not leave the room, a database 51 for walking person information, and data output A means 45, a database 46 storing hospital layout diagrams, a walking direction determining means 47, and the like.

  The outing information writing means 41 inputs the outing detection information Jk (with mat number) from the wireless tag reader / writer 30 and compares the ID code of the outing detection information Jk with the ID code of the database 43. It is determined whether or not the ID code of the patient is prohibited from walking. If the patient is prohibited from walking, the walking direction information Hi including the date and time (in seconds) of the timer 42 is stored in the database 44. Write to. The walking direction information Hi will be described later.

  When the outgoing / walking direction information Hi is stored in the database 44, the data output means 45 causes the personal computer 38 to display an outgoing / walking management table of the outgoing / walking direction information Hi. Further, a layout diagram of the hospital floor including the room number (see FIG. 13) is retrieved from the database 46 and displayed on the personal computer 38.

  The walking direction determination means 47 reads the mat number of the walking direction information Hi, searches the database 48 for mat group identification information (mat group number, mat number, left, right) having this mat number, and selects the right or left It is determined whether or not the mat has been stepped on, and the determination result is added to the walking direction information Hi.

  That is, as shown in FIG. 12, the walking direction information Hi is composed of a room number, a time when leaving the entrance, a time when dividing left or right, an ID code, a name, an age, a person in charge, and the like.

  Therefore, when the patient leaves the room and steps on the right mat, the right mat in front of this room in the hospital layout diagram displayed on the screen is displayed by color and the outing information Hi is displayed. It ’s easy to see which direction the patient should n’t go.

  In the above embodiment, the transmission / reception antenna unit composed of a magnetic field loop antenna, a capacitor, and the like is covered with a cloth or the like, but may be built in a brick, a tile, or the like.

1 is a schematic configuration diagram of a wireless tag system according to a first embodiment. 4 is an explanatory diagram for explaining a relationship among a mat group with a built-in magnetic field antenna, a wireless tag reader / writer 30, and a wireless tag 36 built in a slipper 35. FIG. FIG. 6 is an explanatory diagram of an outing management table according to the first embodiment. It is explanatory drawing of the monitoring chart displayed on a personal computer. 3 is a schematic configuration diagram of a wireless tag system according to a second embodiment. FIG. 6 is a schematic configuration diagram of a wireless tag system according to Embodiment 3. FIG. 10 is a sequence diagram illustrating a wireless tag system according to Embodiment 3. FIG. FIG. 10 is an explanatory diagram of a monitoring diagram displayed on a personal computer of the wireless tag system according to the third embodiment. FIG. 10 is an explanatory diagram illustrating a wireless tag system according to a fourth embodiment. FIG. 10 is an explanatory diagram illustrating a monitoring diagram displayed on a personal computer according to a fourth embodiment. FIG. 10 is a schematic configuration diagram of a wireless tag system according to a fifth embodiment. FIG. 10 is an explanatory diagram for explaining an outing management table according to the fifth embodiment. FIG. 20 is an explanatory diagram of a monitoring diagram displayed on the personal computer according to the fifth embodiment. It is a schematic block diagram of the conventional wireless tag system.

Explanation of symbols

30 wireless tag reader / writer 32 mat with built-in magnetic field antenna 37 server 41 walking information writing means 42 timer 45 data output means

Claims (6)

A wireless transmission / reception system comprising a passive type wireless tag attached to a moving body, a wireless tag reader / writer and a magnetic field antenna built-in medium incorporating a magnetic loop antenna, is monitored by the wireless tag reader / writer via a communication network. A wireless tag system connected to a center computer system,
The magnetic antenna built-in medium is
It does not include a link coil, has a magnetic field loop coil and a capacitor, and is covered with a rectangular medium,
A magnetic field antenna medium group in which a plurality of magnetic field antenna built-in media are arranged adjacent to each other in a non-contact manner at intervals within a certain distance; and
The wireless tag reader / writer is
A transmission / reception antenna unit having a magnetic field loop coil having the same size as the magnetic field loop coil of the wireless tag, a capacitor, and a link coil having a shorter loop length than the magnetic field loop coil;
A feeder connected to the link coil of the transmitting / receiving antenna unit;
A transmission / reception circuit unit that is connected to the power supply line, adds a wireless tag reader / writer number to the detection signal of the wireless tag detected by the link coil, and transmits this to the computer system of the monitoring center as wireless tag detection information; And the RFID tag reader / writer is disposed adjacent to any one of the magnetic field antenna media of the magnetic field antenna medium group. The magnetic field loop coil and the capacitor are connected in series,
The resonance frequency f is in the 13 MHz band,

The wireless tag system according to claim 1, wherein: Among the magnetic field antenna medium group, the predetermined number of magnetic field antenna built-in media from the RFID tag reader / writer is:
In addition to the magnetic field loop coil and capacitor, a link coil is provided.
3. The RFID tag system according to claim 1, wherein the inspection link coil is connected to a feeder line branched from a feeder line in the RFID tag reader / writer. The wireless tag is
4. The wireless tag system according to claim 1, 2 or 3, wherein the RFID tag system is attached to the bottom of the footwear or attached to the back surface of the moving body.   The RFID tag system according to claim 1, 2, 3, or 4, wherein the magnetic field antenna medium group is arranged on a floor surface, a wall surface, a ceiling, a road, a track, or a table. The computer system of the monitoring center includes a server and a personal computer terminal,
The server
Timer,
First storage means for storing monitoring diagram data obtained by combining polygons of the magnetic field antenna medium group in association with the RFID tag reader / writer number on drawing data of a monitoring area in which the magnetic field antenna medium group is disposed;
Second storage means for storing the ID code and name of the wireless tag;
Means for displaying the monitoring diagram data on a screen of the personal computer terminal;
Means for reading the wireless tag detection information from the wireless tag reader / writer and determining whether the ID code of the wireless tag detection information is an ID code to be monitored;
In the case of the ID code of the monitoring target, the polygon of the magnetic field antenna medium group of the monitoring chart data corresponding to the RFID tag reader / writer number of the RFID tag detection information is displayed by color and the time information of the timer and the timer information 6. The wireless tag system according to claim 1, further comprising means for displaying a name linked to the ID code.

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