JP6473640B2 - Goods management system - Google Patents

Description

  The present invention relates to an article management system for managing the arrangement state of articles in each arrangement area within a management target area in which a plurality of arrangement areas for arranging articles are arranged in a line.

  In order to manage the number of products placed on the product shelf, a wireless tag capable of wirelessly transmitting identification information is assigned to each product, and the wireless tag of each product is provided via an antenna disposed below the product shelf. There is known a wireless tag system configured to acquire identification information.

  Further, in this type of wireless tag system, even if a plurality of shelves are arranged in the product shelf, the identification information of the shelf can be acquired from the wireless tag of the product placed on each shelf. It has been proposed to adjust the material and thickness (see, for example, Patent Document 1).

  In other words, when a plurality of shelves are arranged in the product shelf, the products are arranged so as to overlap in the vertical direction, so that the transmission radio waves from the antenna arranged above or below the product shelf The identification information may not be acquired from the wireless tag without reaching the wireless tag.

  For this reason, in the wireless tag system disclosed in Patent Document 1, the transmission radio wave from the antenna is placed on each shelf board by being transmitted through the lower shelf board and reflected by the upper shelf board or reflecting board. The transmission radio wave from the antenna reaches all the radio tags of the products.

JP 2012-221100 A

However, in a product shelf having a plurality of shelves, it is extremely troublesome to adjust the radio wave transmittance and reflectivity for each shelf plate, and there is a problem that it takes time to install the product shelves.
In addition, it is difficult to construct the proposed RFID tag system using existing product shelves. Even if the RFID tag system can be constructed by changing the shelf board, the cost for improving the product shelf is low. There was a problem that it took.

  The present invention has been made in view of such a problem, and an article to each placement area within an existing management target area in which a plurality of placement areas for placing articles are arranged in a line like a product shelf. The purpose of this is to make it possible to accurately manage the arrangement state of the.

The invention according to claim 1, which has been made to achieve such an object, provides the arrangement state of articles in each arrangement area within a management target area in which a plurality of arrangement areas for arranging articles are arranged in a line. An article management system for managing,
Provided at the end position on one end side of each arrangement area in the arrangement direction and at the boundary position of each arrangement area, and the radiation direction of the radio wave is different from one end side in the arrangement direction of each arrangement area as the end position. A plurality of antennas arranged to face the end side;
Information acquisition means for acquiring identification information from a wireless tag attached to the article in each of the arrangement areas via the plurality of antennas;
Management means for identifying management information including at least the number of the articles in each placement area based on the identification information acquired by the information acquisition means, and displaying or storing the management information;
With
The management means includes
The management means includes
If the identification information obtained via the antennas is captured from the information acquisition means and the captured identification information is obtained with only one antenna, the article corresponding to the identification information is the antenna. If the management information is set and the identification information taken in from the information acquisition means is obtained from a plurality of antennas, it is assumed that the information is arranged in an arrangement area adjacent to the radiation direction side of the radio wave. The management information is set on the assumption that the article corresponding to the identification information is arranged in the arrangement area adjacent to the radio wave radiation direction side of the antenna farthest from the end position among the plurality of antennas. It is characterized by that.

The invention according to claim 2 is the article management system according to claim 1,
When the identification information acquired from the information acquisition means is obtained from a plurality of antennas, the management means compares the received signal level from each antenna when the information acquisition means acquires the identification information. If the received signal level from another antenna is higher than a predetermined level by the received signal level from the antenna farthest from the end position among the plurality of antennas, the identification information includes The management information is set on the assumption that the corresponding article is arranged in the arrangement area adjacent to the radio wave radiation direction side of the antenna having a high reception signal level.

The invention described in claim 3 is the article management system according to claim 1 or 2,
The management target area is a shelf in which the arrangement area is formed in a plurality of stages in the vertical direction, and the plurality of antennas have a radio wave radiation direction upward on a shelf plate on which the article is placed in each arrangement area. It is comprised by the planar antenna assembled | attached so that it may face.

  The article management system according to claim 1 includes a plurality of antennas respectively provided at an end position on one end side in the arrangement direction of a plurality of arrangement areas in which articles are arranged, and at a boundary position of each arrangement area. .

  Each of the plurality of antennas is arranged so as to face the other end side from one end side in the arrangement direction of each arrangement region which is an end position where one of the antennas is arranged. Identification information is acquired from a wireless tag attached to an article in each placement area via an antenna.

  Then, the management means specifies management information including at least the number of articles in each placement area based on the identification information acquired by the information acquisition means, and displays or stores the specified management information.

  In addition, the management means captures the identification information obtained from each information acquisition means via each antenna, and if the retrieved identification information is obtained with only one antenna, the article corresponding to the identification information Sets management information on the assumption that the antenna is arranged in the arrangement area adjacent to the radiation direction side of the radio wave of the one antenna.

  If the identification information captured from the information acquisition means is obtained from a plurality of antennas, the article corresponding to the identification information is the furthest away from the end position of the management target area among the plurality of antennas. Management information is set on the assumption that the antenna is arranged in an arrangement area adjacent to the antenna in the radiation direction side.

  Note that, when the same identification information can be acquired via a plurality of antennas, the wireless tag that has transmitted the identification information is the antenna that is adjacent to the most distal end in the radio wave radiation direction among the plurality of antennas. This is because it can be determined that the signal exists on the radiation direction side of the radio wave.

  Therefore, according to the article management system of the present invention, as in the conventional system described above, each of the components in the management target area is adjusted without adjusting the radio wave transmission characteristics and reflection characteristics of the partition plates provided at the boundaries of the respective arrangement areas. It becomes possible to accurately grasp the number and type of articles arranged in the arrangement area.

  By the way, in the present invention, the radiation directions of the plurality of antennas arranged in the management target area are all set in the same direction along the arrangement direction of the article arrangement areas, and can be obtained via each antenna. Articles arranged in each arrangement area are specified from the identification information.

  However, in this case, for example, the radiated radio wave from the wireless tag is reflected by a person or an article around the management target area and wraps around an antenna that does not correspond to the arrangement area of the article to which the wireless tag is attached. It is also possible that the position of is mistakenly recognized.

Therefore, the management means may be configured as described in claim 2.
That is, when the identification information acquired from the information acquisition means is obtained from a plurality of antennas, the management means compares the received signal level from each antenna when the information acquisition means acquires the identification information, When the received signal level from another antenna is higher than a predetermined level than the received signal level from the antenna farthest from the end position of the plurality of antennas, the article corresponding to the identification information is The management information may be set as being arranged in an arrangement area adjacent to the radio wave radiation direction side of the antenna having a high reception signal level.

  If the management means is configured in this way, the identification information transmitted from the wireless tag is transmitted to the antenna adjacent to the front end side in the radio wave radiation direction from the arrangement area of the article to which the wireless tag is attached due to the wraparound of the radio wave. When the information is received, the fact is detected by the reception level of the identification information by the information acquisition means, and it is possible to prevent erroneous determination of the arrangement position of the article corresponding to the identification information.

  Further, in the case where the management target area is a shelf in which the arrangement area is formed in a plurality of stages in the vertical direction as in the conventional system described above, the plurality of antennas may be configured by planar antennas as described in claim 3. .

  That is, in the article management system according to claim 3, each of the planar antennas assembled so that the radiation direction of the radio wave faces upward with respect to the shelf plate on which the article is placed in each arrangement region, Identification information is acquired from the wireless tag attached to the article.

  Then, using the planar antenna, the identification information transmitted from the wireless tag of the article placed on the planar antenna can be obtained more reliably, and the management performance of the article can be obtained. Can be improved.

It is explanatory drawing showing the structure of the whole article | item management system of embodiment. It is a flowchart showing the article management process performed in a management apparatus. It is explanatory drawing showing the management information obtained by the article | item management process of FIG. It is a flowchart showing the modification of an article | item management process. It is explanatory drawing showing the management information obtained by the article | item management process of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the article management system of this embodiment is for managing a plurality of products 12 stored in a product shelf 2.

  The product shelf 2 includes, for example, three stages of shelf boards 4, 6, and 8 in the vertical direction, and planar antennas 14, 16, and 18 are provided on the top surfaces of the shelf boards 4, 6, and 8, respectively. In the product shelf 2, at least the shelf boards 4, 6, and 8 are made of a non-conductive material that can transmit radio waves (for example, synthetic resin, wood, etc.).

  The planar antennas 14, 16, and 18 are well-known antennas that are configured by distributing and arranging a large number of antenna elements (for example, patch antennas) along the plate surface of the substrate, and have directivity characteristics outward from one plate surface. is there.

  Each planar antenna 14, 16, 18 is placed on each shelf plate 4, 6, 8 so that it can radiate radio waves upward from the plate surface of each shelf plate 4, 6, 8; A cushion material (not shown) is laid on the upper surface so that the product 12 can be directly placed thereon.

  Each of the plurality of products 12 placed on the shelf boards 4, 6, 8 (specifically, the planar antennas 14, 16, 18) has unique identification information ("A", " RFID tags 20 having “B”, “C”, “D”) are attached.

The planar antennas 14, 16, and 18 are for performing wireless communication with the RFID tag 20 attached to each product 12, and are connected to the RFID reader / writer 30.
The RFID reader / writer 30 wirelessly transmits a calling signal for calling the RFID tag 20 from each of the planar antennas 14, 16, and 18, and the identification information (hereinafter simply referred to as ID) transmitted from the RFID tag 20 in response to the calling signal. Is also obtained via each planar antenna 14, 16, 18.

  That is, the RFID tag 20 attached to each product 12 measures the number of times the call signal is received or the elapsed time after the reception, and the number of times the call signal is received or the elapsed time matches between the RFID tags 20 using random numbers or the like. When the set value set so as not to be performed is reached, its own ID is transmitted.

  For this reason, the RFID tag 20 attached to each product 12 transmits its own ID at different timings, and the RFID reader / writer 30 transmits the ID via the planar antennas 14, 16, 18. Sequentially.

  Further, the RFID reader / writer 30 switches the planar antenna used for transmitting the calling signal and acquiring the ID in accordance with a command from the management device 40, and outputs the ID acquired via the planar antenna to the management device 40.

  The management device 40 manages the number and arrangement position of the products 12 stored in the product shelf 2 based on the ID of each RFID tag 20 (in other words, each product 12) acquired through the RFID reader / writer 30. It is constituted by an information processing device such as a personal computer.

  The management device 40 is connected to an operation unit 42 including a keyboard and a mouse, a storage unit 44 including a hard disk and a memory card, and a display unit 46 including a liquid crystal display.

  For this reason, the user inputs an instruction to the management device 40 via the operation unit 42 to acquire the ID from the RFID tag 20 of the product 12 stored in the product shelf 2, and stores the acquisition result in the storage unit. 44, or displayed on the display unit 46.

Next, an article management process that is periodically executed in the management device 40 in order for the management device 40 to automatically manage the products 12 stored in the product shelf 2 will be described.
This article management process is a process periodically executed in the management device 40 in accordance with a computer program stored in the storage unit 44 or the built-in memory.

  In the following description, when the RFID tag 20 first receives a call signal transmitted from the planar antenna 14, 16, or 18, the random number is generated and the number of reception of the call signal until the ID is transmitted is received. Is set, and the ID is transmitted when the number of times the call signal is received reaches the set number.

  Further, if the RFID tag 20 does not receive a call signal for a predetermined time or more, the RFID tag 20 deletes the number of times the call signal has been received or the number of times the call signal has been received. Assume that counting of the number of signal receptions is started.

Since the RFID tag having such a configuration is well known, detailed description of the RFID tag 20 is omitted here.
As shown in FIG. 2, in the article management process, first in S110 (S represents a step), among the plurality of planar antennas 14, 16, 18, the uppermost planar antenna (planar antenna 18 in FIG. 1). In order, the planar antenna used for acquiring the ID from the RFID tag 20 is selected.

  In S120, a call command for causing the RFID reader / writer 30 to transmit a call signal from the planar antenna selected in S110 is output, thereby calling a call signal for calling the RFID tag 20 from the planar antenna. Let it transmit wirelessly.

  In step S130, the RFID reader / writer 30 determines whether or not the ID from the RFID tag 20 has been acquired via the planar antenna that has transmitted the call signal after the call signal is transmitted.

If the RFID reader / writer 30 has not acquired an ID, the process proceeds to S160, and if the RFID reader / writer 30 has acquired an ID, the process proceeds to S140.
In S140, the ID acquired by the RFID reader / writer 30 this time has already been acquired via another planar antenna (specifically, the planar antenna positioned above the planar antenna selected in S110), and the storage unit It is judged whether or not it is registered in No. 44.

  If it is determined in S140 that the ID acquired this time has already been registered, the process proceeds to S160. If it is determined in S140 that the ID acquired this time has not yet been registered, the process proceeds to S150. To do.

  In S150, it is assumed that the ID acquired by the RFID reader / writer 30 this time is that of the product 12 placed on the shelf corresponding to the planar antenna selected in S110. Are registered in the storage unit 44 in association with the arrangement positions (upper, lower, and middle), and the process proceeds to S160.

  In S160, it is determined whether or not reading of the ID using the planar antenna selected in S110 has been completed by determining whether or not the call command output process in S120 has been executed a predetermined number of times. .

  That is, since the RFID tag 20 generates a random number when the call signal is first received and sets the number of times the call signal is received until the ID is transmitted, in S160, the call instruction output process in S120 is performed. Then, it is determined whether or not the number of times necessary to transmit the ID from the RFID tag 20 (that is, the maximum value of the random number) has been performed.

  If it is determined in S160 that the ID reading using the planar antenna selected in S110 is not completed, the process proceeds to S120 again, and the ID reading using the planar antenna is completed in S160. If it is determined that the process has been performed, the process proceeds to S170.

  In S170, whether or not the series of processing of S110 to S160 described above was performed using all the planar antennas 14, 16, 18 provided in the commodity shelf 2, that is, all the planar antennas 14, 16, 18 are performed. Is used to determine whether or not the ID has been read.

If it is determined in S170 that ID reading has been performed using all the planar antennas 14, 16, 18, the article management process is terminated.
If it is determined in S170 that ID reading using all the planar antennas 14, 16, and 18 has not been completed, the process proceeds to S110.

  As a result, in S110, the planar antenna provided on the shelf lower than the previously selected planar antenna shelf is selected, and the processing from S120 onward is executed. In S110, the process waits for a certain period of time required for the RFID tag 20 to delete the number of receptions and the set number of call signals, and the process proceeds to S120.

  As described above, in the article management system of the present embodiment, the IDs are acquired from the RFID tags 20 of the products 12 on the shelf boards 4 to 8 serving as the boundaries of the arrangement area of the products 12 in the product shelf 2, respectively. Flat antennas 14 to 18 are provided. Moreover, each planar antenna 14-18 is provided in each shelf board 4-8 so that the radiation direction of an electromagnetic wave may face the upper direction, respectively.

  Therefore, the call signals transmitted from the respective planar antennas 14 to 18 reach the product 12 positioned above the planar antennas 14 to 18 that transmitted the call signals, and are transmitted to the planar antennas 14 to 18 that transmitted the call signals. The ID transmitted from the RFID tag 20 of the product 12 arrives.

  Therefore, as indicated by a circle in FIG. 3, the planar antenna 18 provided on the uppermost shelf 8 only receives the ID “A” of the product 12 placed on the shelf 8 after transmitting the calling signal. However, the planar antenna 16 provided on the suspended shelf 6 receives the ID “B”, “C” of the product 12 placed on the middle shelf 6 after the call signal is transmitted, The ID “A” of the product 12 placed on the shelf board 8 is received. In addition, the planar antenna 14 provided on the bottom shelf 4 has IDs “A”, “B”, “C”, “D” of all the products stored in the product shelf 2 after transmitting the calling signal. Will receive.

  Therefore, in the present embodiment, by executing the article management process, the planar antennas 16 provided on the middle and lowermost shelf boards 6 and 4 are changed from the planar antenna 18 provided on the uppermost shelf board 8, In order to 14, the planar antenna used for acquiring the ID from the RFID tag 20 is switched, and the ID first acquired by each planar antenna is preferentially used to specify the arrangement position of the article. .

  As a result, as shown in FIG. 3, the product 12 with ID “A” is placed on the top shelf 8 and the products 12 with ID “B” and “C” are placed on the shelf 6 in the middle. , The product 12 with ID “D” is managed as being placed on the bottom shelf 4.

  Therefore, according to the article management system of the present embodiment, as in the conventional system described above, the radio wave transmission characteristics and reflection characteristics of the shelf boards 4 to 8 provided as partition plates at the boundary of the arrangement area of the product 12 are adjusted. Therefore, it is possible to accurately grasp the number and type of the products 12 arranged in each arrangement area.

  In this embodiment, the RFID tag 20 corresponds to the wireless tag of the present invention, the RFID reader / writer 30 corresponds to the information acquisition means of the present invention, and the management device 40 corresponds to the management means of the present invention. To do.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various aspect can be taken in the range which does not deviate from the summary of this invention.
For example, in the above-described embodiment, the planar antennas used for acquiring the ID are sequentially switched from the planar antenna 18 located on the front end side in the radio wave radiation direction to the planar antenna 14 located on the rear end side, whereby each planar antenna is switched. The goods 12 located in the arrangement | positioning area | region (namely, on the shelf boards 4-8) corresponding to 14-18 are specified.

  However, depending on the product shelf 2 itself or the surrounding structure, the transmission radio waves from the planar antennas 16 and 18 wrap around to the opposite side (lower side) of the radiation direction of the radio waves, and the shelves below the planar antennas 16 and 18. It is also conceivable that the ID is transmitted from the RFID tag 20 of the product placed on the plates 4 and 6.

  In this case, when the ID is received by the upper planar antennas 16 and 18, it is assumed that the product located below the planar antennas 16 and 18 exists in the arrangement region corresponding to the planar antennas 16 and 18. Will be erroneously detected.

Therefore, in order to prevent this problem, the article management process may be executed as shown in FIG.
The article management process shown in FIG. 4 is a modification of the article management process shown in FIG. 2, and only the processes in S155 and S210 to S230 described below are different from those shown in FIG. .

  That is, in the article management process shown in FIG. 4, when it is determined in S140 that the ID acquired this time is not yet registered, the process proceeds to S155, and the ID and the ID received by the RFID reader / writer 30 are received. The signal level is registered in the storage unit 44 in association with the shelf position.

  If it is determined in S140 that the ID acquired this time has already been registered, the process proceeds to S210, and the received signal level Va at the time of registration of the ID is read from the storage unit 44 and read. The received signal level Va is compared with the received signal level Vb when the current ID is acquired.

  In subsequent S220, as a result of the comparison, it is determined whether or not the current received signal level Vb is higher than the received signal level Va at the time of ID registration by a predetermined level ΔV or more (Vb> Va + ΔV?). If the received signal level Vb is greater than the received signal level Va at the time of ID registration by a predetermined level ΔV or more, the process proceeds to S230, and if not, the process proceeds to S160.

  In S230, the ID acquired this time and the current received signal level are registered in the storage unit 44 in association with the arrangement position of the shelf corresponding to the antenna used for receiving the current ID, and the process proceeds to S160. Note that in S230, the previous ID registration information is deleted from the storage unit 44, thereby rewriting the arrangement position of the ID acquired this time.

  As described above, in the article management process shown in FIG. 4, when the same ID is acquired by a plurality of planar antennas, the arrangement area corresponding to the upper planar antenna is preferentially set as in the above embodiment. Only when the received signal level at the time of ID acquisition is larger than the predetermined level ΔV when the ID is acquired by the lower planar antenna, the setting is changed to the arrangement region corresponding to the lower planar antenna ( (See FIG. 5).

  Therefore, in this case, even when the transmission radio waves from the planar antennas 16 and 18 wrap around to the opposite side of the radio wave radiation direction, the arrangement position of the product can be managed accurately.

  Next, in the above embodiment, the RFID tag 20 that receives the call signal and transmits the identification information is provided on the product 12 so as to manage the arrangement position of the product 12 on the product shelf 2. The wireless tag provided on the article to be provided does not necessarily have to receive the calling signal and transmit the identification information. For example, the identification information is randomly transmitted at a timing that does not overlap with other wireless tags. Also good.

  In this case, the management device 40 switches the antenna used to receive the identification information, sequentially reads the identification information from each wireless tag, and, as in the above-described embodiment or modification, from the acquired identification information, What is necessary is just to specify a position.

  In the above embodiment, identification information is acquired in order from the antenna located at the front end side in the radiation direction of the radio wave from each antenna in the article management processing shown in FIG. 2 or FIG. The identification information acquired in this way has been described as being preferentially used to specify the position of the article.

  However, for example, identification information (or identification information and reception level) acquired by all antennas is stored, and the position of each article specified by the identification information is specified from the storage result. Good.

  In this case, a receiving device such as a tag reader (in other words, information acquisition means) that acquires identification information from a wireless tag via a plurality of antennas can acquire identification information from each antenna individually without switching the antenna. If configured, the management device 40 can acquire the identification information received by the receiving device as it is.

  In this case, when specifying the position of each article from the identification information acquired from the reception device, the management device 40 determines whether the identification information is obtained from a plurality of antennas. If the information is obtained from a plurality of antennas, the antenna closest to the wireless tag that transmitted the identification information may be selected from the plurality of antennas to identify the position of the article.

  Specifically, for example, from among a plurality of antennas that have acquired the same identification information, select the antenna farthest from the bottom antenna that is the end position in the direction opposite to the radiation direction of the radio wave of each antenna, The article may be arranged in an arrangement area adjacent to the antenna in the direction of radio wave radiation.

  That is, in the above-described embodiment, the antennas used for acquiring the identification information are sequentially from the antenna farthest from the lowermost antenna, which is the end position in the direction opposite to the radio wave radiation direction, to the lowermost antenna. The identification information acquired for the first time with the switched antenna is specified as the identification information of the article in the arrangement region adjacent to the radiation direction side of the radio wave of the antenna. When the antenna from which the identification information is acquired can be grasped, the position of the article corresponding to the identification information can be specified without switching the antenna used to acquire the identification information.

  In this case, in order to prevent erroneous determination due to the wraparound of radio waves, when selecting the antenna farthest from the end position from among a plurality of antennas having the same identification information, the position of the article is specified. The signal level when the identification information is acquired by the antenna in the same procedure as the article management process (specifically S210 to S230) shown in FIG. 4, and the signal level when the identification information is acquired by another antenna Should be compared.

Next, the antenna is not limited to a planar antenna, but may be any antenna that can radiate radio waves in one direction.
Moreover, although the said embodiment demonstrated the article management system used for managing the position and number of the goods accommodated in the goods shelf 2, this invention is not a shelf but the goods used as management object, for example, The present invention can be applied even in the case where it is arranged in an arrangement region (storage box or the like) arranged in a line with an inclination in the horizontal direction or stepwise.

  In other words, in this case, an antenna is provided at each end position of the arrangement area in the arrangement direction on one end side and the boundary position of each arrangement area, and the radio wave radiation direction of the antenna is changed from one end side in the arrangement direction of each arrangement area. If the setting is made so as to face the end side, the arrangement state of the articles in each arrangement area can be managed as in the above embodiment.

  2 ... Product shelf, 4, 6, 8 ... Shelf board, 12 ... Product, 14, 16, 18 ... Planar antenna, 20 ... RFID tag, 30 ... RFID reader / writer, 40 ... Management device, 42 ... Operation unit, 44 ... Storage unit, 46... Display unit.

Claims (3)

An article management system for managing an arrangement state of articles in each arrangement area within a management target area in which a plurality of arrangement areas for arranging articles are arranged in a line,
Provided at the end position on one end side of each arrangement area in the arrangement direction and at the boundary position of each arrangement area, and the radiation direction of the radio wave is different from one end side in the arrangement direction of each arrangement area as the end position. A plurality of antennas arranged to face the end side;
Information acquisition means for acquiring identification information from a wireless tag attached to the article in each of the arrangement areas via the plurality of antennas;
Management means for identifying management information including at least the number of the articles in each placement area based on the identification information acquired by the information acquisition means, and displaying or storing the management information;
With
The management means includes
If the identification information obtained via the antennas is captured from the information acquisition means and the captured identification information is obtained with only one antenna, the article corresponding to the identification information is the antenna. If the management information is set and the identification information taken in from the information acquisition means is obtained from a plurality of antennas, it is assumed that the information is arranged in an arrangement area adjacent to the radiation direction side of the radio wave. The management information is set on the assumption that the article corresponding to the identification information is arranged in the arrangement area adjacent to the radio wave radiation direction side of the antenna farthest from the end position among the plurality of antennas. An article management system characterized by that.   When the identification information acquired from the information acquisition means is obtained from a plurality of antennas, the management means compares the received signal level from each antenna when the information acquisition means acquires the identification information. If the received signal level from another antenna is higher than a predetermined level by the received signal level from the antenna farthest from the end position among the plurality of antennas, the identification information includes 2. The article management according to claim 1, wherein the management information is set on the assumption that a corresponding article is arranged in an arrangement area adjacent to a radio wave radiation direction side of an antenna having a high reception signal level. system.   The management target area is a shelf in which the arrangement area is formed in a plurality of stages in the vertical direction, and the plurality of antennas have a radio wave radiation direction upward on a shelf plate on which the article is placed in each arrangement area. The article management system according to claim 1, wherein the article management system is configured by a planar antenna that is assembled so as to face the direction.