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WO2010151132A1 - Configuration d'antenne d'étagère - Google Patents

Configuration d'antenne d'étagère Download PDF

Info

Publication number
WO2010151132A1
WO2010151132A1 PCT/NL2010/050399 NL2010050399W WO2010151132A1 WO 2010151132 A1 WO2010151132 A1 WO 2010151132A1 NL 2010050399 W NL2010050399 W NL 2010050399W WO 2010151132 A1 WO2010151132 A1 WO 2010151132A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
shelf
merlons
antenna configuration
loops
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/NL2010/050399
Other languages
English (en)
Inventor
Rudi Beijers
Pieter Lieuwe Roosenschoon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nederlandsche Apparatenfabriek NEDAP NV
Original Assignee
Nederlandsche Apparatenfabriek NEDAP NV
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 Nederlandsche Apparatenfabriek NEDAP NV filed Critical Nederlandsche Apparatenfabriek NEDAP NV
Publication of WO2010151132A1 publication Critical patent/WO2010151132A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect
    • 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
    • H01Q1/2216—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 interrogator/reader equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Definitions

  • the invention relates to a shelf antenna configuration for an RFID system for recognizing objects which are provided with an RFID label and which are located in a shelf system with one or more shelves, and to a shelf system provided with at least one shelf antenna configuration.
  • RFID Radio Frequency Identification
  • Such systems usually comprise a transmitting/receiving device, which, with the aid of an antenna system having at least one loop antenna lying in a substantially flat plane, generates a magnetic interrogation field in an interrogation zone or detection zone.
  • an RFID system comprises a number of detection labels, also called labels, for short, or detection plates, transponders, responders or tags.
  • These labels each comprise at least one loop antenna lying in a flat plane to allow communication with the interrogation field when a label is in the interrogation field.
  • a good coupling between the antenna system and the label antenna is of great importance.
  • the loop antenna of the label should comprise as many field lines of the interrogation field as possible. In practice, this means that the label antenna should have a minimum size of a few centimeters and that the label antenna should be in one plane which preferably extends parallel to the loop antenna of the transmitting/receiving device or at an angle thereto that is not too large. According as the angle between the label antenna and the transmitting/receiving antenna approaches 90°, the coupling between the two antennas becomes worse.
  • the books or the like can each be provided with a detection label.
  • this label can only be arranged on or to the upper cover or the lower cover, or possibly flat between the pages of the book.
  • the label, and hence the label antenna then lies in a plane extending transversely to the plane of the bookshelf.
  • use of a transmitting/receiving antenna lying in the plane of the bookshelf or product shelf is not straightforwardly possible.
  • a product shelf provided with one or two antenna loops lying in the plane of the product shelf is used, which have a first long, straight, forward conductor extending lengthwise of the product shelf and linking up with a second, backward conductor completing the antenna loop, which has a sawtooth shape.
  • a rotary field is formed in a spatially highly limited area.
  • WO 2006/008705 Al (Philips), consisting of one or more closed loops formed by an antenna wire and located in one plane and/or widened regions separated by narrowed sections.
  • the closed loops and the widened areas form specific locations for identifying objects provided with an RFID label present in those regions.
  • an RFID antenna configuration for a shoplifting detection system which comprises a separate transmitting antenna, consisting of a single loop, and two receiving antennas lying one on top of the other and working according to a multiplex method.
  • One receiving antenna comprises two loops and the other receiving antenna three.
  • the receiving antennas have cross points which are shifted with respect to each other in the direction in which a detection label normally passes the antennas. Furthermore, the receiving antennas are jointly shifted with respect to the transmitting antenna.
  • the object of the invention is to make available a shelf antenna configuration with which the above-mentioned drawbacks are obviated or at least reduced and with which both labels extending transversely to an antenna system lying in the plane of a shelf and labels extending parallel to the antenna system, or labels with a different orientation, can be detected or identified in a reliable manner.
  • a shelf antenna configuration comprises a first and a second antenna loop, which antenna loops form transmitting/receiving antennas substantially identical in shape and each lie in a substantially flat plane, which flat planes extend parallel to each other at a short distance from each other, wherein the antenna loops have a length direction and a width direction, and wherein each antenna loop has a forward conductor which forms a number of first merlons and a backward conductor which forms a number of second merlons, wherein the first and the second merlons alternate with each other and the flanks of the first and the second merlons are at such a distance from each other that between these flanks no coupling or only a slight coupling occurs, while the branches of the first and second merlons of an antenna loop that extend in the length direction are shifted with respect to each other in the width direction and wherein the antenna loops overlap each other but are also positioned shifted with respect to each other in the width direction and the length direction, wherein only a slight coupling between the
  • Fig. 1 schematically shows in front view an example of a cupboard with shelves on which objects can be placed or laid
  • Fig. 2 schematicaDy shows in top plan view an example of a shelf provided with an exemplary embodiment of an antenna configuration according to the invention
  • FIG. 3 schematically shows a rear view of the shelf of Fig. 2
  • Fig. 4 schematically shows a bottom view of the shelf of Fig. 2;
  • Fig. 5 shows in perspective a bottom view of a shelf according to the invention.
  • Fig. 1 shows in outline in front view an example of a shelf system 1 in which the invention can be applied.
  • shelf system is understood to mean an assembly of several bearing shelves, storage shelves, product shelves, etc., mounted between uprights and/or to a wall, as well as a single shelf, which may be attached to a wall with, for example, brackets or the like.
  • the shelf system shown as an example in Fig. 1 is designed as a bookcase with two side walls 2, a top wall 3, four bookshelves 4, of which the lowermost forms the bottom of the bookcase, and legs 5.
  • the bookcase may, at will, be further provided with a rear wall or not.
  • a drawback of the use of antenna loops in bookends is that relatively many bookends are then required, which occupy often scarce shelf space and which hinder free placement of the books and a free arrangement of the bookshelves.
  • the RFID labels 8 are identified with the aid of special transmitting/receiving antennas provided in the bookshelves 4, described in more detail in the following. Bookends provided with transmitting/receiving antennas are then superfluous. Moreover, with the antenna configuration according to the invention, also horizontally oriented labels, such as, for instance, a label 8 of a horizontally oriented book, can be identified. This means that with an antenna configuration according to the invention not only books and similarly shaped objects provided with RFID labels, such as CDs, DVDs, video tapes, etc., can be identified, but also other types of articles, such as, for instance, store articles, for instance jeans lying on a shelf in a pile, or medicines in boxes, can be identified if they are provided with RFID labels.
  • Figs. 2, 3 and 4 schematically show an example of a configuration of transmitting/receiving antennas provided in a shelf 4 according to the invention in top plan view, rear view and bottom view, respectively.
  • the antenna configuration shown comprises two specially formed antenna loops 10, 11, which are provided in recesses in a top surface 12, and bottom surface 13, respectively, of a core layer 14 of a shelf 4.
  • the two antenna loops 10, 11 each form a transmitting/receiving antenna, i.e., with each antenna loop, both an interrogation field can be generated and a detection label can be detected.
  • the antenna loops jointly extend substantially throughout the length and width of a shelf 4.
  • the two antenna loops 10, 11 are furthermore substantially identical in shape and overlap for the greater part, but are shifted with respect to each other both in the length direction of the shelf 4 and in the width direction thereof.
  • the core 14 in which the antenna loops are located can be manufactured from a suitable electrically insulating material, such as a suitable plastic, or MDF, or a foam material.
  • the core 14 is covered with a top plate 15, not shown in Figs. 2 and 4, and a bottom plate 16, see Figs. 3 and 5.
  • the core 14 has a recess 17 near one end of the shelf on the rear side, which provides room for a connector (not shown) for connection of the antenna configuration to an RFID transmitting/receiving device schematically indicated at 18 in Fig. 2.
  • the recess 17 is also provided in the bottom plate 16.
  • the antenna loops 10, 11 are both of merlon-shaped design, with the merlons of one, for instance the forward, path of an antenna loop being positioned in shifted relation with respect to the merlons of the other, for instance the backward, path of the same antenna loop.
  • the right-hand terminal of the first antenna loop 10 is indicated with 19 and the left-hand terminal with 20.
  • the right-hand terminal of the second antenna loop 11 is indicated with 21 and the left-hand terminal with 22.
  • the conductor of antenna loop 10 connected thereto has a first horizontal (in the drawing) branch or section A extending over a distance a in the length direction of the shelf 4 at a short distance from the nearby longitudinal edge 24 of the recess 17.
  • the conductor turns off at a right angle in the direction of the front longitudinal edge 25 of the shelf located opposite the recess 17 for forming a first vertical (in the drawing) branch B having a length b.
  • the length b is selected such that the branch B extends to a point well over half the width of the shelf 4, in the example shown to a point at approximately three-fourths of the width of the shelf 4.
  • the conductor has a horizontal branch C extending in the length direction of the shelf again over a distance c, which in this example is slightly longer than the distance a, then to proceed with a vertical branch D over a distance b to a point p located at a short distance from the longitudinal edge 24.
  • the branches BCD form a first merlon form, with the branches B and D forming the flanks of the merlon extending in the width direction of the shelf, which interconnect the lengthwise extending branches A and C, and C and E 1 respectively.
  • the antenna loop 10 forms a second merlon form FGH, followed by a last horizontal branch I.
  • the first and second merlon forms in this example are substantially identical in shape.
  • Linking up with the horizontal branch I is a first backward merlon form JKL, of which the horizontal branch K located near the front longitudinal edge 25 of the shelf 4 is closer to the front longitudinal edge 25 than are the horizontal branches G and C.
  • the downward in Fig.
  • branch L of the first backward merlon form extends substantially parallel to and spaced to the right from the downward branch H of the second forward merlon form FGH.
  • the path L links up at some distance before the path I with a horizontal backward branch M, which in turn links up with a second backward merlon form NOP, which is followed again by a backward horizontal branch Q and a third merlon form RST.
  • the branch T ends at the second terminal 20 of the first antenna loop 10.
  • the first and second backward merlon forms JKL and NOP in this example are substantially identical in shape, while the last merlon form RST is slightly wider.
  • the vertical branches of the forward merlon forms in operation, always carry currents flowing in the same direction as the nearby vertical branches of the backward merlon forms, but always lie at such a distance from the nearby vertical branches of the backward merlon forms that between the mutually adjacent conductors of the different merlon forms no coupling or only a slight coupling with a slight self-induction occurs.
  • the first antenna loop accordingly consists of a number of merlon forms or substantially right-angled tooth forms in both the forward and the backward path of the antenna loop, with the merlon forms of the forward path and the backward path being shifted with respect to each other both in horizontal direction and in vertical direction.
  • a number of juxtaposed composite loops ABST, QDCR, EFOP, MHGN and IJKL having in operation in each case an opposite current direction and corresponding opposite magnetic fields.
  • the opposite current directions in the juxtaposed composite loops of the antenna loop 11 are schematically indicated with curved arrows 30 to 34.
  • the antenna loop 11 has the same shape as the antenna loop 10 described in detail hereinabove, but is shifted with respect to the antenna loop 10 over such a distance to the left (in the drawing) that the vertical branches in each case are situated at the central area of the composite loops of the antenna loop 10.
  • the vertical branches of the antenna loop 10 are situated at the central area of the composite loops of the antenna loop 11.
  • the antenna loop 11 as a whole is shifted with respect to the antenna loop 10 in the direction of the longitudinal edge 25 of the shelf 4, so that also the horizontal branches of the antenna loop 10 are spaced apart from the corresponding horizontal branches of the antenna loop 11.
  • the coupling between the antenna loops is slight.
  • the dead areas (neutral points) of one antenna loop are compensated by active areas of the other antenna loop and vice versa, so that effectively no dead zones occur.
  • the antenna loops 10, 11 are energized by the device 18 according to a multiplex method or with a phase difference of 90°. This last may be effected, for example, with a delay line or a splitter or through a suitable choice of the coupling between the antenna loops.
  • Fig. 5 shows in perspective bottom view a shelf according to the invention, where the core 14 with the antenna configuration shown in Figs. 2 to 4 is covered by a top plate 15 and a bottom plate 16.
  • the top plate 15 also covers the recess 17, while the bottom plate 16 leaves it clear.
  • the shelf 4 may be enclosed by a metal cover edge 36 (Fig. 3), which extends along the front edge, side edges and rear edge.
  • a metal cover edge 36 Fig. 3
  • Such a cover edge not only protects the core 14 but also forms a short-circuit conductor limiting the interrogation field.
  • one or two short-circuit conductors may also, if desired, be arranged in the core itself around the antenna loops.
  • one side of a shelf may be provided with a shielding layer if the interrogation field should be active exclusively on the other side, for example, only above or only under the shelf.
  • the merlons could have a different shape, for example, a trapezoid shape or a shape having slightly bent branches, without departing from the principle of merlons or teeth shifted with respect to each other in two directions, per antenna loop, while a sufficient distance between the various branches of the forward and backward paths is preserved, and from the principle of antenna loops shifted with respect to each other in two directions.
  • the flanks do not need to extend exclusively in the width direction (vertical direction), but the flanks can also have a horizontal component.
  • the parts situated between the flanks could have a vertical component, whether or not in combination with flanks that have a horizontal component.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

L'invention concerne une configuration d'antenne d'étagère destinée à un système RFID permettant de reconnaître des objets qui sont équipés d'une étiquette RFID et qui sont situés sur un système d'étagères comprenant une ou plusieurs étagères. La configuration d'antenne d'étagère comprend une première et une seconde boucle d'antenne de forme identique qui constituent des antennes d'émission/réception et qui s'étendent dans des plans plats parallèles présentant une longueur et une largeur. Chaque boucle d'antenne comprend un conducteur aller qui forme de premiers merlons et un conducteur retour qui forme de seconds merlons, les premiers et seconds merlons alternant et les flancs des premiers et seconds merlons se trouvant à distance les uns des autres tandis que les branches des merlons d'une boucle d'antenne qui s'étendent dans le sens de la longueur sont décalées les unes par rapport aux autres dans le sens de la largeur et les boucles d'antenne sont décalées les unes par rapport aux autres dans de la largeur et de la longueur.
PCT/NL2010/050399 2009-06-25 2010-06-25 Configuration d'antenne d'étagère Ceased WO2010151132A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL2003083 2009-06-25
NL2003083 2009-06-25
NL2004775 2010-05-27
NL2004775A NL2004775C2 (nl) 2009-06-25 2010-05-27 Schapantenneconfiguratie.

Publications (1)

Publication Number Publication Date
WO2010151132A1 true WO2010151132A1 (fr) 2010-12-29

Family

ID=42545457

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2010/050399 Ceased WO2010151132A1 (fr) 2009-06-25 2010-06-25 Configuration d'antenne d'étagère

Country Status (2)

Country Link
NL (1) NL2004775C2 (fr)
WO (1) WO2010151132A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2903086A1 (fr) * 2014-02-04 2015-08-05 Sick Ag Dispositif de lecture RFID pour la détection de l'occupation d'étagères
US10025960B1 (en) 2016-06-29 2018-07-17 The United States of America, as represented by the Administrator of the National Aeronautics and Space Administraion Frequency multiplexed radio frequency identification
EP3543895A1 (fr) 2018-03-23 2019-09-25 SURGE CLOUD Sp. z o.o. Système de rayonnage intelligent

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030139163A1 (en) * 2001-11-30 2003-07-24 Ryuzo Noda Loop antenna, loop antenna system and wireless communication system
FR2836581A1 (fr) 2002-02-25 2003-08-29 Sidep Procede de detection d'etiquette radiofrequence a signal module continu, panneau et dispositif pour la mise en oeuvre du procede
WO2005081808A1 (fr) 2004-02-20 2005-09-09 3M Innovative Properties Company Antenne multi-boucles de communication de l'identification de frequences rf (rfid)
WO2006008705A1 (fr) 2004-07-16 2006-01-26 Koninklijke Philips Electronics N.V. Antenne destinee a communiquer avec une multitude de transpondeurs
EP1693778A1 (fr) * 2005-02-18 2006-08-23 N.V. Nederlandsche Apparatenfabriek NEDAP Système d'étagères munis d'une système de détection d'étiquettes pour lire des étiquettes RFID

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030139163A1 (en) * 2001-11-30 2003-07-24 Ryuzo Noda Loop antenna, loop antenna system and wireless communication system
US6844859B2 (en) 2001-11-30 2005-01-18 Lintec Corporation Loop antenna, loop antenna system and wireless communication system
FR2836581A1 (fr) 2002-02-25 2003-08-29 Sidep Procede de detection d'etiquette radiofrequence a signal module continu, panneau et dispositif pour la mise en oeuvre du procede
WO2005081808A1 (fr) 2004-02-20 2005-09-09 3M Innovative Properties Company Antenne multi-boucles de communication de l'identification de frequences rf (rfid)
WO2006008705A1 (fr) 2004-07-16 2006-01-26 Koninklijke Philips Electronics N.V. Antenne destinee a communiquer avec une multitude de transpondeurs
EP1693778A1 (fr) * 2005-02-18 2006-08-23 N.V. Nederlandsche Apparatenfabriek NEDAP Système d'étagères munis d'une système de détection d'étiquettes pour lire des étiquettes RFID

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2903086A1 (fr) * 2014-02-04 2015-08-05 Sick Ag Dispositif de lecture RFID pour la détection de l'occupation d'étagères
US9323968B2 (en) 2014-02-04 2016-04-26 Sick Ag RFID reading apparatus for shelf occupancy detection
US10025960B1 (en) 2016-06-29 2018-07-17 The United States of America, as represented by the Administrator of the National Aeronautics and Space Administraion Frequency multiplexed radio frequency identification
US10121030B1 (en) 2016-06-29 2018-11-06 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Frequency multiplexed radio frequency identification
US10552651B1 (en) 2016-06-29 2020-02-04 United States Of America As Represented By The Administrator Of The National Aeronautics And Space Frequency multiplexed radio frequency identification
US10567146B1 (en) 2016-06-29 2020-02-18 United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Frequency multiplexed radio frequency identification
US11088812B1 (en) 2016-06-29 2021-08-10 United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Frequency multiplexed radio frequency identification
EP3543895A1 (fr) 2018-03-23 2019-09-25 SURGE CLOUD Sp. z o.o. Système de rayonnage intelligent

Also Published As

Publication number Publication date
NL2004775C2 (nl) 2010-12-28

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