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WO2024160648A1 - System using rfid technology for the inventory of objects in a space delimited by an enclosure - Google Patents

System using rfid technology for the inventory of objects in a space delimited by an enclosure Download PDF

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Publication number
WO2024160648A1
WO2024160648A1 PCT/EP2024/051769 EP2024051769W WO2024160648A1 WO 2024160648 A1 WO2024160648 A1 WO 2024160648A1 EP 2024051769 W EP2024051769 W EP 2024051769W WO 2024160648 A1 WO2024160648 A1 WO 2024160648A1
Authority
WO
WIPO (PCT)
Prior art keywords
objects
radiating element
auxiliary radiating
enclosed space
electromagnetic waves
Prior art date
Application number
PCT/EP2024/051769
Other languages
French (fr)
Inventor
Anh Tu HO
Jean-Anaël MONBLANC
Original Assignee
Nexess
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nexess filed Critical Nexess
Publication of WO2024160648A1 publication Critical patent/WO2024160648A1/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10158—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field
    • G06K7/10178—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves methods and means used by the interrogation device for reliably powering the wireless record carriers using an electromagnetic interrogation field including auxiliary means for focusing, repeating or boosting the electromagnetic interrogation field
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10366—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications
    • G06K7/10415—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being fixed in its position, such as an access control device for reading wireless access cards, or a wireless ATM
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q10/00—Administration; Management
    • G06Q10/08—Logistics, e.g. warehousing, loading or distribution; Inventory or stock management
    • G06Q10/087—Inventory or stock management, e.g. order filling, procurement or balancing against orders
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30—Arrangements for providing operation on different wavebands
    • H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • H01Q5/364—Creating multiple current paths
    • H01Q5/371—Branching current paths
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H01Q9/285—Planar dipole
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07773—Antenna details
    • G06K19/07794—Antenna details the record carrier comprising a booster or auxiliary antenna in addition to the antenna connected directly to the integrated circuit

Definitions

  • the present invention relates to a system using RFID technology for inventorying objects contained in a space limited by an enclosure.
  • At least one transponder also called a tag, consisting of an electronic circuit provided with an antenna for transmitting and receiving data in the form of radio frequency waves, the circuit comprising at least one memory in which an identifier of said transponder is stored,
  • a reading point also consisting of an electronic circuit equipped with an antenna to transmit and receive data also in the form of radiofrequency waves, and
  • each tag located in a coverage area where the electromagnetic field generated by the reading point is at a sufficiently high level, is electrically powered by the electromagnetic wave, comes out of its standby state, becomes active and emits then identification data specific to it in the form of a modulated electromagnetic wave.
  • This identification data is received by the reading point which then proceeds to identify the tag in question.
  • each tag is attached to an object, such as a tool used for the maintenance of a workshop, a factory, etc.
  • the objects to be inventoried are stored in an enclosed space, such as a piece of furniture, a cabinet, a cupboard. This enclosed space is subdivided into a plurality of enclosed sub-spaces such as for example shelves, drawers, etc.
  • tags have been miniaturized, the configuration of the tag antennas has been modified to be able to be used on metal objects or surfaces such as plastic, rubber and the sensitivity of the RFID readers has been improved.
  • RFID tags today have a size not exceeding 40mm 3 and have miniature antennas which lead to a significant drop in their gain.
  • the invention relates to a system for inventorying objects contained in an enclosed space delimited by an enclosure, the system comprising a control device connected to a UHF RFID reader placed in the enclosed space, the UHF RFID reader being provided with at least one antenna which emits electromagnetic waves intended for RFID tags arranged on the objects, the objects each having a predetermined position in the enclosed space, characterized in that at least part of the predetermined positions comprises a auxiliary radiating element of electromagnetic waves.
  • the present invention makes it possible to strengthen the electromagnetic fields around tagged metallic objects, leading to an improvement in the detection of the object. Furthermore, the invention, by using auxiliary radiating elements, offers a possibility of adapting the design according to the need and ease of implementation.
  • the auxiliary radiating element is made up of two branches of trapezoidal shape and two load bars each having a notch.
  • the invention makes it possible to improve the detection rate of the tagged object in a closed metal space.
  • the proposed pattern provides more flexibility in the positioning of the object by having performances less sensitive to the angular direction of the tag and in the optimization of the antenna.
  • a branch of trapezoidal shape has three recesses arranged on the largest side of the trapezoidal shape.
  • the present invention by having an asymmetrical form, aims to expand the operating range of the solution in the ETSI and FCC bands by having a wide band or multi-bands.
  • the solution will also reduce the size of the auxiliary radiating element.
  • a branch of trapezoidal shape has two recesses, each recess being respectively on one side of the trapezoidal shape.
  • the present invention by having an asymmetrical form, aims to expand the operating range of the solution in the ETSI and FCC bands by having a wide band or multi-bands.
  • the solution will also reduce the size of the auxiliary radiating element.
  • FIG. 1 is a schematic view of a servant inventory system in which the present invention is implemented
  • FIG. 2 is an example of architecture of the inventory system according to the present invention
  • FIG. 3 illustrates the operating principle of the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention
  • FIG. 4 is a first example of an improved system for inventorying objects contained in a limited space using RFID technology according to the present invention
  • FIG. 5 is a second embodiment of the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention.
  • FIG. 6 is a first example of an embodiment of an auxiliary radiating element of electromagnetic waves used in the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention
  • FIG. 7 is a second example of an embodiment of an auxiliary radiating element of electromagnetic waves used in the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention
  • FIG. 8 is a third embodiment of an auxiliary radiating element of electromagnetic waves used in the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention.
  • Fig. 1 is a schematic view of an inventory system according to a first embodiment of the present invention.
  • the inventory system shown in Fig. 1 is intended to inventory objects which are contained in an enclosed space such as a piece of furniture 10, a cupboard or a workshop trolley, which can contain elements such as shelves, drawers Tir forming enclosed sub-spaces.
  • This enclosed space and these enclosed sub-spaces are respectively delimited by a metal enclosure.
  • the objects in question are, for example, tools for maintaining a workshop, a factory, etc. These objects are provided with an RFID tag (Radio Frequency IDentification: Identification by radio frequency).
  • the inventory system includes a control device 100.
  • Fig. 2 is an example of architecture of the inventory system according to the present invention.
  • the control device 100 is connected to a UHF RFID reader 250 placed in the enclosed space 10.
  • the UHF RFID reader 250 is provided with at least one antenna not shown which emits electromagnetic waves intended for RFID tags.
  • the control device 100 is, for example, a computer, a smartphone, a touchscreen tablet.
  • the objects contained in the enclosed space each have a predetermined position thus allowing the control device to determine whether or not each object is present in the enclosed space.
  • At least part of the predetermined positions comprises an auxiliary radiating element of electromagnetic waves according to the invention.
  • the auxiliary radiating elements Erai to Era ⁇ are arranged.
  • Fig. 3 illustrates the operating principle of the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention.
  • the UHF RFID reader 250 is provided with at least one antenna (not shown) which emits electromagnetic waves to RFID tags.
  • the electromagnetic waves are received by the auxiliary radiating element Era.
  • the auxiliary radiating element Era receives energy in the form of electromagnetic waves, the energy induces a current fe ra which generates an intense magnetic field HEra.
  • the presence of the object OMT comprising an RFID tag in the intense magnetic field introduces an inductive current IOMT inside the object, which makes it possible to power the RFID tag.
  • the higher the density of the HEra magnetic field the greater the power received by the RFID tag.
  • the signal received by the RFID tag is reinforced, thus increasing the reading range of the UHF RFID 250 reader.
  • Fig. 4 is a first example of an improved system for inventorying objects contained in a limited space using RFID technology according to the present invention.
  • a predetermined position comprises an auxiliary radiating element Era according to the invention.
  • the auxiliary radiating element Era is placed on a substrate, for example of type FR4, with a thickness of 1.6 mm, resting on a ground plane GND.
  • the OMT object comprising an RFID tag Pue is placed above the auxiliary radiating element Era.
  • the Pue RFID tag is placed opposite the Era auxiliary radiating element.
  • the Pue RFID tag can be arranged in a different orientation, thus allowing the OMT object to be arranged in any orientation, provided that the object is placed above the auxiliary radiating element.
  • Fig. 5 is a second embodiment of the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention.
  • a predetermined position comprises an auxiliary radiating element Era according to the invention.
  • the auxiliary radiating element Era is placed on a Sub substrate resting on a GND ground plane.
  • the OMT object comprising an RFID tag Pue is placed above the auxiliary radiating element Era.
  • a foam shaped to be adapted to the shape of the OMT object intended to be placed the predetermined position, is arranged above the auxiliary radiating element Era.
  • the foam is made of a material permeable to electromagnetic waves, for example polyurethane. This material has a permittivity of 1.03 to 1.21 for the frequency band below 10 GHz. Thus, the foam is completely transparent to the propagation of electromagnetic waves.
  • the Pue RFID tag is placed opposite the Era auxiliary radiating element.
  • the Pue RFID tag can be arranged in a different orientation, allowing the OMT object to be arranged in any orientation, provided that the object is placed above the auxiliary radiating element.
  • Fig. 6 is a first exemplary embodiment of an auxiliary radiating element of electromagnetic waves used in the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention.
  • the Era auxiliary radiating element is made up of two trapezoidal branches Tral and Tra 2 and two load bars Bel and Bc2, each comprising a notch separating the load bar into two distinct parts.
  • the length of the two bars Bel and Bc2 and the width of the notch are 52 mm and 0.4 mm, respectively.
  • the width of the bars is measured at 2 mm.
  • the proposed configuration makes it possible to optimize the radiating structure, which makes an improvement in detection of the tagged object in different directions.
  • Fig. 7 is a second embodiment of an auxiliary radiating element of electromagnetic waves used in the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention.
  • the auxiliary radiating element Era is made up of two trapezoidal branches Tral and Tra 2 and two load bars Bel and Bc2 each comprising a notch separating the load bar into two distinct parts.
  • the trapezoidal shaped branch Tra2 has three recesses or slots arranged on the largest side of the trapezoidal shape. These recesses or slots allow the bandwidth of the Era auxiliary radiating element to be adjusted.
  • Fig. 8 is a third embodiment of an auxiliary radiating element of electromagnetic waves used in the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention.
  • the Era auxiliary radiating element is made up of two trapezoidal branches Tral and Tra 2 and two load bars Bel and Bc2, each comprising a notch separating the load bar into two distinct parts.
  • the trapezoidal shaped branch Tra2 has two recesses or slots, each recess or slot being respectively on one side of the trapezoidal shape. These recesses or slots allow the bandwidth of the Era auxiliary radiating element to be adjusted.

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Abstract

The invention relates to a system for the inventory of objects (OMT1, OMTN) contained in an enclosed space delimited by an enclosure. The system comprises a control device (100) connected to a UHF RFID reader (250) arranged in the enclosed space, and the UHF RFID reader is provided with at least one antenna which emits electromagnetic waves to RFID tags (Puc1, PucN) arranged on the objects, the objects each having a predetermined position in the enclosed space. According to the invention, at least a portion of the predetermined positions comprise an auxiliary radiating element (Era1, EraN) radiating electromagnetic waves.

Description

DESCRIPTION DESCRIPTION
Titre : SYSTEME UTILISANT LA TECHNOLOGIE RFID D’INVENTAIRETitle: SYSTEM USING RFID INVENTORY TECHNOLOGY
D’OBJETS DANS UN ESPACE LIMITE PAR UNE ENCEINTE OF OBJECTS IN A SPACE LIMITED BY AN ENCLOSURE
DOMAINE TECHNIQUE TECHNICAL AREA
La présente invention concerne un système utilisant la technologie RFID d'inventaire d'objets contenus dans un espace limité par une enceinte. The present invention relates to a system using RFID technology for inventorying objects contained in a space limited by an enclosure.
ETAT DE LA TECHNIQUE ANTERIEURE STATE OF THE PRIOR ART
Les systèmes d’inventaire d’objets contenus dans un espace limité utilisant la technologie RFID sont connus. De manière générale, un système utilisant la technologie RFID est constitué de trois types d'éléments : Systems for inventorying objects contained in a limited space using RFID technology are known. Generally speaking, a system using RFID technology is made up of three types of elements:
- au moins un transpondeur, dit aussi tag, constitué d'un circuit électronique pourvu d'une antenne pour émettre et recevoir des données sous forme d'ondes radiofréquences, le circuit comportant au moins une mémoire dans laquelle est stocké un identifiant dudit transpondeur, - at least one transponder, also called a tag, consisting of an electronic circuit provided with an antenna for transmitting and receiving data in the form of radio frequency waves, the circuit comprising at least one memory in which an identifier of said transponder is stored,
- un point de lecture constitué lui aussi d'un circuit électronique pourvu d'une antenne pour émettre et recevoir des données également sous forme d'ondes radiofréquences, et - a reading point also consisting of an electronic circuit equipped with an antenna to transmit and receive data also in the form of radiofrequency waves, and
- une unité de contrôle reliée au point de lecture et mettant en œuvre une application. Le fonctionnement d'un tel système RFID est le suivant. Au commencement de la procédure d'identification, le point de lecture émet une onde électromagnétique modulée dite, par la suite, de réveil, à destination de chaque tag du système. A sa réception, un tag, situé dans une zone de couverture où le champ électromagnétique généré par le point de lecture est à un niveau suffisamment élevé, est alimenté électriquement par l’onde électromagnétique, sort de son état de veille, devient actif et émet alors une donnée d'identification qui lui est propre sous forme d'une onde électromagnétique modulée. Cette donnée d'identification est reçue par le point de lecture qui procède alors à l'identification du tag considéré. Dans l'application à un système d'inventaire envisagée ici, chaque tag est fixé à un objet, tel qu'un outil servant à la maintenance d'un atelier, d'une usine, etc. Les objets à inventorier sont rangés dans un espace clos, tel qu'un meuble, une servante, une armoire. Cet espace clos se subdivise en une pluralité de sous-espaces clos tels que par exemple des étagères, des tiroirs, etc... - a control unit connected to the reading point and implementing an application. The operation of such an RFID system is as follows. At the start of the identification procedure, the reading point emits a modulated electromagnetic wave, subsequently called a wake-up wave, to each tag in the system. Upon receipt, a tag, located in a coverage area where the electromagnetic field generated by the reading point is at a sufficiently high level, is electrically powered by the electromagnetic wave, comes out of its standby state, becomes active and emits then identification data specific to it in the form of a modulated electromagnetic wave. This identification data is received by the reading point which then proceeds to identify the tag in question. In the application to an inventory system considered here, each tag is attached to an object, such as a tool used for the maintenance of a workshop, a factory, etc. The objects to be inventoried are stored in an enclosed space, such as a piece of furniture, a cabinet, a cupboard. This enclosed space is subdivided into a plurality of enclosed sub-spaces such as for example shelves, drawers, etc.
Plusieurs évolutions technologiques sont apparues ces dernières années pour rendre la technologie RFID plus efficace et plus discrète. Les tags ont été miniaturisés, la configuration des antennes des tags a été modifiée pour pouvoir être utilisée sur des objets métalliques ou des surfaces telles que le plastique, le caoutchouc et la sensibilité des lecteurs RFID a été améliorée. Several technological developments have appeared in recent years to make RFID technology more efficient and more discreet. The tags have been miniaturized, the configuration of the tag antennas has been modified to be able to be used on metal objects or surfaces such as plastic, rubber and the sensitivity of the RFID readers has been improved.
Les tags RFID ont ainsi aujourd’hui une taille n’excédant pas 40mm3 et ont des antennes miniatures qui conduisent à une chute importante du gain de celles-ci. RFID tags today have a size not exceeding 40mm 3 and have miniature antennas which lead to a significant drop in their gain.
Il est alors difficile de détecter des objets disposant de tags RFID dans des enceintes closes ayant un volume important. It is then difficult to detect objects with RFID tags in closed enclosures with a large volume.
EXPOSE DE L'INVENTION STATEMENT OF THE INVENTION
A cette fin, l’invention concerne un système d'inventaire d'objets contenus dans un espace clos délimité par une enceinte, le système comportant un dispositif de contrôle relié à un lecteur UHF RFID disposé dans l’espace clos, le lecteur UHF RFID étant pourvu d'au moins une antenne qui émet des ondes électromagnétiques à destination de tags RFID disposés sur les objets, les objets ayant chacun une position prédéterminée dans l’espace clos, caractérisé en ce qu’au moins une partie des positions prédéterminées comporte un élément rayonnant auxiliaire d’ondes électromagnétiques. To this end, the invention relates to a system for inventorying objects contained in an enclosed space delimited by an enclosure, the system comprising a control device connected to a UHF RFID reader placed in the enclosed space, the UHF RFID reader being provided with at least one antenna which emits electromagnetic waves intended for RFID tags arranged on the objects, the objects each having a predetermined position in the enclosed space, characterized in that at least part of the predetermined positions comprises a auxiliary radiating element of electromagnetic waves.
Ainsi, la présente invention permet de renforcer les champs électromagnétiques autour des objets métalliques tagués, conduisant à une amélioration de la détection de l’objet. En outre, l’invention, en utilisant des éléments rayonnants auxiliaires, offre une possibilité d’adapter la conception en fonction du besoin et une facilité de mise en œuvre. Selon un mode particulier, l’élément rayonnant auxiliaire est constitué de deux branches de forme trapézoïdale et de deux barres de charge comportant chacune une encoche. Thus, the present invention makes it possible to strengthen the electromagnetic fields around tagged metallic objects, leading to an improvement in the detection of the object. Furthermore, the invention, by using auxiliary radiating elements, offers a possibility of adapting the design according to the need and ease of implementation. According to a particular mode, the auxiliary radiating element is made up of two branches of trapezoidal shape and two load bars each having a notch.
Ainsi, l’invention permet d’améliorer le taux de détection de l’objet tagué dans un espace métallique clos. Le motif proposé apporte plus de souplesse dans le positionnement de l’objet en ayant des performances moins sensibles à la direction angulaire du tag et dans l’optimisation de l’antenne. Thus, the invention makes it possible to improve the detection rate of the tagged object in a closed metal space. The proposed pattern provides more flexibility in the positioning of the object by having performances less sensitive to the angular direction of the tag and in the optimization of the antenna.
Selon un mode particulier, une branche de forme trapézoïdale comporte trois évidements disposés sur le côté le plus grand de la forme trapézoïdale. According to a particular embodiment, a branch of trapezoidal shape has three recesses arranged on the largest side of the trapezoidal shape.
Ainsi, la présente invention, en ayant une forme asymétrique, vise à élargir la plage de fonctionnement de la solution dans les bandes ETSI et FCC en ayant une large bande ou des multi -bandes. En outre, la solution permettra également de réduire la dimension de l’élément rayonnant auxiliaire. Thus, the present invention, by having an asymmetrical form, aims to expand the operating range of the solution in the ETSI and FCC bands by having a wide band or multi-bands. In addition, the solution will also reduce the size of the auxiliary radiating element.
Selon un mode particulier, une branche de forme trapézoïdale comporte deux évidements, chaque évidement étant respectivement sur un côté de la forme trapézoïdale. According to a particular embodiment, a branch of trapezoidal shape has two recesses, each recess being respectively on one side of the trapezoidal shape.
Ainsi, la présente invention, en ayant une forme asymétrique, vise à élargir la plage de fonctionnement de la solution dans les bandes ETSI et FCC en ayant une large bande ou des multi -bandes. En outre, la solution permettra également de réduire la dimension de l’élément rayonnant auxiliaire. Thus, the present invention, by having an asymmetrical form, aims to expand the operating range of the solution in the ETSI and FCC bands by having a wide band or multi-bands. In addition, the solution will also reduce the size of the auxiliary radiating element.
BREVE DESCRIPTION DES DESSINS BRIEF DESCRIPTION OF THE DRAWINGS
Les caractéristiques de l'invention mentionnées ci-dessus, ainsi que d'autres, apparaîtront plus clairement à la lecture de la description suivante d'exemples de réalisation, ladite description étant faite en relation avec les dessins joints, parmi lesquels : The above-mentioned and other features of the invention will become more apparent from the following description of exemplary embodiments, said description being made in conjunction with the accompanying drawings, among which:
[Fig. 1] est une vue schématique d'un système d'inventaire d’une servante dans lequel la présente invention est implémentée ; [Fig. 1] is a schematic view of a servant inventory system in which the present invention is implemented;
[Fig. 2] est un exemple d’architecture du système d'inventaire selon la présente invention ; [Fig. 3] illustre le principe de fonctionnement du système amélioré d’inventaire d’objets contenus dans un espace limité utilisant la technologie RFID selon la présente invention ; [Fig. 2] is an example of architecture of the inventory system according to the present invention; [Fig. 3] illustrates the operating principle of the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention;
[Fig. 4] est un premier exemple de réalisation du système amélioré d’inventaire d’objets contenus dans un espace limité utilisant la technologie RFID selon la présente invention ; [Fig. 4] is a first example of an improved system for inventorying objects contained in a limited space using RFID technology according to the present invention;
[Fig. 5] est un second exemple de réalisation du système amélioré d’inventaire d’objets contenus dans un espace limité utilisant la technologie RFID selon la présente invention ; [Fig. 5] is a second embodiment of the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention;
[Fig. 6] est un premier exemple de réalisation d’un élément rayonnant auxiliaire d’ondes électromagnétiques utilisé dans le système amélioré d’inventaire d’objets contenus dans un espace limité utilisant la technologie RFID selon la présente invention ; [Fig. 6] is a first example of an embodiment of an auxiliary radiating element of electromagnetic waves used in the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention;
[Fig. 7] est un second exemple de réalisation d’un élément rayonnant auxiliaire d’ondes électromagnétiques utilisé dans le système amélioré d’inventaire d’objets contenus dans un espace limité utilisant la technologie RFID selon la présente invention ; [Fig. 7] is a second example of an embodiment of an auxiliary radiating element of electromagnetic waves used in the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention;
[Fig. 8] est un troisième exemple de réalisation d’un élément rayonnant auxiliaire d’ondes électromagnétiques utilisé dans le système amélioré d’inventaire d’objets contenus dans un espace limité utilisant la technologie RFID selon la présente invention. [Fig. 8] is a third embodiment of an auxiliary radiating element of electromagnetic waves used in the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention.
EXPOSE DETAILLE DE MODES DE REALISATION DETAILED DESCRIPTION OF EMBODIMENTS
La Fig. 1 est une vue schématique d'un système d'inventaire selon un premier mode de réalisation de la présente invention. Fig. 1 is a schematic view of an inventory system according to a first embodiment of the present invention.
Le système d'inventaire représenté à la Fig. 1 est prévu pour inventorier des objets qui sont contenus dans un espace clos tel qu'un meuble 10, une armoire ou une servante d'atelier, qui peut contenir des éléments tels que des étagères, des tiroirs Tir formant des sous-espaces clos. Cet espace clos et ces sous-espaces clos sont respectivement délimités par une enceinte métallique. Les objets en question sont par exemple des outils pour assurer la maintenance d'un atelier, d'une usine, etc. Ces objets sont pourvus d'un tag RFID (Radio Frequency IDentification : Identification par radiofréquence). The inventory system shown in Fig. 1 is intended to inventory objects which are contained in an enclosed space such as a piece of furniture 10, a cupboard or a workshop trolley, which can contain elements such as shelves, drawers Tir forming enclosed sub-spaces. This enclosed space and these enclosed sub-spaces are respectively delimited by a metal enclosure. The objects in question are, for example, tools for maintaining a workshop, a factory, etc. These objects are provided with an RFID tag (Radio Frequency IDentification: Identification by radio frequency).
Le système d'inventaire comprend un dispositif de contrôle 100. The inventory system includes a control device 100.
La Fig. 2 est un exemple d’architecture du système d'inventaire selon la présente invention. Fig. 2 is an example of architecture of the inventory system according to the present invention.
Le dispositif de contrôle 100 est relié à un lecteur UHF RFID 250 disposé dans l’espace clos 10. Le lecteur UHF RFID 250 est pourvu d'au moins une antenne non représentée qui émet des ondes électromagnétiques à destination de tags RFID. Le dispositif de contrôle 100 est, par exemple, un ordinateur, un téléphone intelligent, une tablette tactile. The control device 100 is connected to a UHF RFID reader 250 placed in the enclosed space 10. The UHF RFID reader 250 is provided with at least one antenna not shown which emits electromagnetic waves intended for RFID tags. The control device 100 is, for example, a computer, a smartphone, a touchscreen tablet.
Les objets contenus dans l’espace clos ont chacun une position prédéterminée permettant ainsi au dispositif de contrôle de déterminer ou non si chaque objet est présent dans l’espace clos. The objects contained in the enclosed space each have a predetermined position thus allowing the control device to determine whether or not each object is present in the enclosed space.
Au moins une partie des positions prédéterminées comporte un élément rayonnant auxiliaire d’ondes électromagnétiques selon l’invention. At least part of the predetermined positions comprises an auxiliary radiating element of electromagnetic waves according to the invention.
Par exemple, dans le tiroir Tir, aux positions prédéterminées des objets OMTi à OMTN comportant un tag Puci, à PUCN, sont disposés les éléments rayonnants auxiliaires Erai à Era\. For example, in the drawer Tir, at the predetermined positions of the objects OMTi to OMTN comprising a tag Puci, to PUCN, the auxiliary radiating elements Erai to Era\ are arranged.
La Fig. 3 illustre le principe de fonctionnement du système amélioré d’inventaire d’objets contenus dans un espace limité utilisant la technologie RFID selon la présente invention. Fig. 3 illustrates the operating principle of the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention.
Le lecteur UHF RFID 250 est pourvu d'au moins une antenne non représentée qui émet des ondes électromagnétiques à destination de tags RFID. Les ondes électromagnétiques sont reçues par l’élément rayonnant auxiliaire Era. Lorsque l’élément rayonnant auxiliaire Era reçoit de l’énergie sous la forme d’ondes électromagnétiques, l’énergie induit un courant fera qui génère un champ magnétique intense HEra. La présente de l’objet OMT comportant un tag RFID dans le champ magnétique intense introduit un courant inductif IOMT à l’intérieur de l’objet, ce qui permet d’alimenter le tag RFID. Plus la densité du champ magnétique HEra est élevée, plus la puissance reçue par le tag RFID est importante. Le signal reçu par le tag RFID est renforcé impliquant alors une augmentation de la portée de lecture du lecteur UHF RFID 250. The UHF RFID reader 250 is provided with at least one antenna (not shown) which emits electromagnetic waves to RFID tags. The electromagnetic waves are received by the auxiliary radiating element Era. When the auxiliary radiating element Era receives energy in the form of electromagnetic waves, the energy induces a current fe ra which generates an intense magnetic field HEra. The presence of the object OMT comprising an RFID tag in the intense magnetic field introduces an inductive current IOMT inside the object, which makes it possible to power the RFID tag. The higher the density of the HEra magnetic field, the greater the power received by the RFID tag. The signal received by the RFID tag is reinforced, thus increasing the reading range of the UHF RFID 250 reader.
La Fig. 4 est un premier exemple de réalisation du système amélioré d’inventaire d’objets contenus dans un espace limité utilisant la technologie RFID selon la présente invention. Fig. 4 is a first example of an improved system for inventorying objects contained in a limited space using RFID technology according to the present invention.
Dans l’exemple de la Fig. 4, une position prédéterminée comporte un élément rayonnant auxiliaire Era selon l’invention. In the example of Fig. 4, a predetermined position comprises an auxiliary radiating element Era according to the invention.
L’élément rayonnant auxiliaire Era est disposé sur un substrat, par exemple de type FR4, d’épaisseur 1.6 mm, reposant sur un plan de masse GND. The auxiliary radiating element Era is placed on a substrate, for example of type FR4, with a thickness of 1.6 mm, resting on a ground plane GND.
L’objet OMT comportant un tag RFID Pue est disposé au-dessus de l’élément rayonnant auxiliaire Era. The OMT object comprising an RFID tag Pue is placed above the auxiliary radiating element Era.
Dans la Fig. 4, le tag RFID Pue est disposé en regard de l’élément rayonnant auxiliaire Era. In Fig. 4, the Pue RFID tag is placed opposite the Era auxiliary radiating element.
Selon la forme de l’élément rayonnant auxiliaire Era, le tag RFID Pue peut être disposé selon une orientation différente, permettant ainsi de disposer l’objet OMT dans n’importe quelle orientation, à condition que l’objet soit placé au-dessus de l’élément rayonnant auxiliaire. Depending on the shape of the Era auxiliary radiating element, the Pue RFID tag can be arranged in a different orientation, thus allowing the OMT object to be arranged in any orientation, provided that the object is placed above the auxiliary radiating element.
La Fig. 5 est un second exemple de réalisation du système amélioré d’inventaire d’objets contenus dans un espace limité utilisant la technologie RFID selon la présente invention. Fig. 5 is a second embodiment of the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention.
Dans l’exemple de la Fig. 5, une position prédéterminée comporte un élément rayonnant auxiliaire Era selon l’invention. In the example of Fig. 5, a predetermined position comprises an auxiliary radiating element Era according to the invention.
L’élément rayonnant auxiliaire Era est disposé sur un substrat Sub reposant sur un plan de masse GND. The auxiliary radiating element Era is placed on a Sub substrate resting on a GND ground plane.
L’objet OMT comportant un tag RFID Pue est disposé au-dessus de l’élément rayonnant auxiliaire Era. The OMT object comprising an RFID tag Pue is placed above the auxiliary radiating element Era.
Afin d’assurer un bon positionnement de l’objet OMT comportant un tag RFID, une mousse, conformée pour être adaptée à la forme de l’objet OMT destiné à être placé à la position prédéterminée, est disposée au-dessus de l’élément rayonnant auxiliaire Era. In order to ensure good positioning of the OMT object comprising an RFID tag, a foam, shaped to be adapted to the shape of the OMT object intended to be placed the predetermined position, is arranged above the auxiliary radiating element Era.
La mousse est constituée d’un matériau perméable aux ondes électromagnétiques, par exemple en polyuréthane. Ce matériau a une permittivité de 1.03 à 1.21 pour la bande de fréquence au-dessous de 10 GHz. Ainsi, la mousse est complètement transparente à la propagation d’ondes électromagnétiques. The foam is made of a material permeable to electromagnetic waves, for example polyurethane. This material has a permittivity of 1.03 to 1.21 for the frequency band below 10 GHz. Thus, the foam is completely transparent to the propagation of electromagnetic waves.
Dans la Fig. 5, le tag RFID Pue est disposé en regard de l’élément rayonnant auxiliaire Era. In Fig. 5, the Pue RFID tag is placed opposite the Era auxiliary radiating element.
Selon la forme de l’élément rayonnant auxiliaire Era, le tag RFID Pue peut être disposé selon une orientation différente, permettant ainsi de disposer l’objet OMT dans n’importe quelle orientation, à condition que l’objet soit placé au-dessus de l’élément rayonnant auxiliaire. Depending on the shape of the Era auxiliary radiating element, the Pue RFID tag can be arranged in a different orientation, allowing the OMT object to be arranged in any orientation, provided that the object is placed above the auxiliary radiating element.
La Fig. 6 est un premier exemple de réalisation d’un élément rayonnant auxiliaire d’ondes électromagnétiques utilisé dans le système amélioré d’inventaire d’objets contenus dans un espace limité utilisant la technologie RFID selon la présente invention. Fig. 6 is a first exemplary embodiment of an auxiliary radiating element of electromagnetic waves used in the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention.
L’élément rayonnant auxiliaire Era est constitué de deux branches de forme trapézoïdale Tral et Tra 2 et de deux barres de charge Bel et Bc2 comportant chacune une encoche séparant la barre de charge en deux parties distinctes. La longueur des deux barres Bel et Bc2 et la largeur de l’encoche sont de 52 mm et 0.4 mm, respectivement. La largeur des barres est mesurée à 2 mm. La configuration proposée permet d’optimiser la structure rayonnante, ce qui rend une amélioration de détection de l’objet tagué dans différentes directions. The Era auxiliary radiating element is made up of two trapezoidal branches Tral and Tra 2 and two load bars Bel and Bc2, each comprising a notch separating the load bar into two distinct parts. The length of the two bars Bel and Bc2 and the width of the notch are 52 mm and 0.4 mm, respectively. The width of the bars is measured at 2 mm. The proposed configuration makes it possible to optimize the radiating structure, which makes an improvement in detection of the tagged object in different directions.
La Fig. 7 est un second exemple de réalisation d’un élément rayonnant auxiliaire d’ondes électromagnétiques utilisé dans le système amélioré d’inventaire d’objets contenus dans un espace limité utilisant la technologie RFID selon la présente invention. Fig. 7 is a second embodiment of an auxiliary radiating element of electromagnetic waves used in the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention.
L’élément rayonnant auxiliaire Era est constitué de deux branches de forme trapézoïdale Tral et Tra 2 et de deux barres de charge Bel et Bc2 comportant chacune une encoche séparant la barre de charge en deux parties distinctes. Dans l’exemple de la Fig. 7, la branche de forme trapézoïdale Tra2 comporte trois évidements ou fentes disposés sur le côté le plus grand de la forme trapézoïdale. Ces évidements ou fentes permettent d’ajuster la bande passante de l’élément rayonnant auxiliaire Era. The auxiliary radiating element Era is made up of two trapezoidal branches Tral and Tra 2 and two load bars Bel and Bc2 each comprising a notch separating the load bar into two distinct parts. In the example of Fig. 7, the trapezoidal shaped branch Tra2 has three recesses or slots arranged on the largest side of the trapezoidal shape. These recesses or slots allow the bandwidth of the Era auxiliary radiating element to be adjusted.
La Fig. 8 est un troisième exemple de réalisation d’un élément rayonnant auxiliaire d’ondes électromagnétiques utilisé dans le système amélioré d’inventaire d’objets contenus dans un espace limité utilisant la technologie RFID selon la présente invention. Fig. 8 is a third embodiment of an auxiliary radiating element of electromagnetic waves used in the improved system for inventorying objects contained in a limited space using RFID technology according to the present invention.
L’élément rayonnant auxiliaire Era est constitué de deux branches de forme trapézoïdale Tral et Tra 2 et de deux barres de charge Bel et Bc2 comportant chacune une encoche séparant la barre de charge en deux parties distinctes. Dans l’exemple de la Fig. 8, la branche de forme trapézoïdale Tra2 comporte deux évidements ou fentes, chaque évidement ou fente étant respectivement sur un côté de la forme trapézoïdale. Ces évidements ou fentes permettent d’ajuster la bande passante de l’élément rayonnant auxiliaire Era. The Era auxiliary radiating element is made up of two trapezoidal branches Tral and Tra 2 and two load bars Bel and Bc2, each comprising a notch separating the load bar into two distinct parts. In the example of Fig. 8, the trapezoidal shaped branch Tra2 has two recesses or slots, each recess or slot being respectively on one side of the trapezoidal shape. These recesses or slots allow the bandwidth of the Era auxiliary radiating element to be adjusted.

Claims

REVENDICATIONS
1. Système d'inventaire d'objets (OMTi, OMTN) contenus dans un espace clos délimité par une enceinte, le système comportant un dispositif de contrôle (100) relié à un lecteur UHF RFID (250) disposé dans l’espace clos, le lecteur UHF RFID étant pourvu d'au moins une antenne qui émet des ondes électromagnétiques à destination de tags RFID (Puci, PUCN) disposés sur les objets, les objets étant destinés à être placés respectivement à une position prédéterminée dans l’espace clos, au moins une partie des positions prédéterminées comportant un élément rayonnant auxiliaire (Erai, Era\) d’ondes électromagnétiques, caractérisé en ce que l’élément rayonnant auxiliaire est constitué de deux branches de forme trapézoïdale et de deux barres de charge comportant chacune une encoche, chaque encoche séparant la barre de charge en deux parties distinctes. 1. Object inventory system (OMTi, OMTN) contained in an enclosed space delimited by an enclosure, the system comprising a control device (100) connected to a UHF RFID reader (250) placed in the enclosed space, the UHF RFID reader being provided with at least one antenna which emits electromagnetic waves intended for RFID tags (Puci, PUCN) placed on the objects, the objects being intended to be placed respectively at a predetermined position in the enclosed space, at least part of the predetermined positions comprising an auxiliary radiating element (Erai, Era\) of electromagnetic waves, characterized in that the auxiliary radiating element consists of two branches of trapezoidal shape and two load bars each comprising a notch , each notch separating the load bar into two distinct parts.
2. Système selon la revendication 1, caractérisé en ce qu’une branche de forme trapézoïdale comporte trois fentes disposées sur le côté le plus grand de la forme trapézoïdale. 2. System according to claim 1, characterized in that a branch of trapezoidal shape has three slots arranged on the largest side of the trapezoidal shape.
3. Système selon la revendication 1, caractérisé en ce qu’une branche de forme trapézoïdale comporte deux fentes, chaque fente étant respectivement sur un côté de la forme trapézoïdale. 3. System according to claim 1, characterized in that a branch of trapezoidal shape has two slots, each slot being respectively on one side of the trapezoidal shape.
PCT/EP2024/051769 2023-02-02 2024-01-25 System using rfid technology for the inventory of objects in a space delimited by an enclosure WO2024160648A1 (en)

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Citations (7)

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TW319918B (en) * 1996-07-30 1997-11-11 Ind Tech Res Inst Trapezoid-similar planar antenna of top load
US20060103532A1 (en) * 2004-11-12 2006-05-18 International Paper Company Electromagnetic pathways to eliminate RFID limitations
WO2008135641A1 (en) * 2007-05-04 2008-11-13 Supertec System for reading rfid tags and showcase for this system
US20090303146A1 (en) * 2008-06-10 2009-12-10 Hon Hai Precision Industry Co., Ltd. Slot antenna
WO2016016396A1 (en) * 2014-08-01 2016-02-04 Tagsys Rfid transponder querying system
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