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WO2003034360A1 - Systeme et panneau d'antenne rfid flexible - Google Patents

Systeme et panneau d'antenne rfid flexible Download PDF

Info

Publication number
WO2003034360A1
WO2003034360A1 PCT/US2002/032723 US0232723W WO03034360A1 WO 2003034360 A1 WO2003034360 A1 WO 2003034360A1 US 0232723 W US0232723 W US 0232723W WO 03034360 A1 WO03034360 A1 WO 03034360A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
panel
antenna panel
region
antenna system
Prior art date
Application number
PCT/US2002/032723
Other languages
English (en)
Inventor
Brian Monahan
Original Assignee
Escort Memory Systems
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 Escort Memory Systems filed Critical Escort Memory Systems
Publication of WO2003034360A1 publication Critical patent/WO2003034360A1/fr

Links

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
    • G06K7/10366—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
    • G06K7/10425—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 the interrogation device being arranged for interrogation of record carriers passing by the interrogation device
    • G06K7/10435—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 the interrogation device being arranged for interrogation of record carriers passing by the interrogation device the interrogation device being positioned close to a conveyor belt or the like on which moving record carriers are passing
    • 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

Definitions

  • the present invention relates in general to radio frequency identification (RFID) devices. More particularly, the invention relates to a flexible RFID antenna panel and system.
  • RFID radio frequency identification
  • RFID systems are well known in the art. Such systems include relatively large packages containing battery powered transmission/receiving circuitry, such as the identification system disclosed in U.S. Patent No. 4,274,083, to passive systems in which the transponder receives its power from the base station or interrogator, such as the identification system disclosed in U.S. Patent No. 4,654,658.
  • a typical RFID system is made up of reusable transponders or tags fixed to or embedded in product carriers, an antenna system that interrogates the tags via a RF link and a controller. The host (or computer) system interfaces with the controller and directs the interrogation of the tags.
  • the RFID antenna system typically employs a high frequency signal to interrogate the tags and, hence, product carriers that are moved on an interrogation path, such as a conveyor.
  • the antenna system is generally disposed near the interrogation path to provide effective communication to and from the tags.
  • the location of the antenna is critical to the interrogation and receipt of the identification code and other data transmitted to and from the tags. For example, if a relatively small single antenna is employed or the antenna is positioned too far from the interrogation path, inadequate coverage of the interrogation path will occur.
  • a frame antenna of rectangular or square shape is fitted around the conveyor.
  • the noted system has several drawbacks. In particular, the antenna system exhibits one or more dead zones for certain tag positions. For example, there is a dead zone across the very center of the conventional frame antenna. If a tag is located within a window that is parallel to the conveyor belt and comprises some distance on either side of the center frame axis, and maintains this position throughout the read area of the antenna, the tag would not be read.
  • the accuracy and completeness of the reading also decreases if several tags are following one another in close succession during movement along the conveyor.
  • tags When tags are in close succession and relatively far from the read antenna, the tags appear to be the same distance from the read antenna and thus send back simultaneous transmissions.
  • the result of a simultaneous transmission is an unintelligible identification code. This is particularly the case in a noisy environment, for which shielding would be necessary.
  • a building or warehouse e.g., dock door
  • the RFID antenna system for communicating with at least one transponder disposed on an object (e.g., product carrier, product, etc.) moveable along an interrogation path generally comprises at least one flexible antenna panel, the antenna panel defining an antenna region, the antenna panel including at least one substantially continuous antenna loop for transmitting and receiving electromagnetic fields, the antenna panel being oriented such that the antenna panel intersects the interrogation path, the antenna panel being adapted to bend about at least a first axis when the object intersects the antenna region.
  • the antenna panel is preferably substantially planar and rectangular in shape.
  • the antenna system comprises at least one substantially rigid antenna panel that similarly defines an antenna region, the antenna panel including at least one substantially continuous antenna loop for transmitting and receiving electromagnetic fields, the antenna panel being oriented such that the antenna panel intersects the interrogation path, the antenna panel being hingedly connected to at least a first hinge connection whereby the antenna panel rotates about the hinge connection when an object intersects the antenna region.
  • the antenna system includes a support member; at least one antenna panel, the antenna panel defining an antenna region, the antenna panel including at least one substantially continuous antenna loop for transmitting at least a first electromagnetic field and receiving at least a second electromagnetic field, the antenna panel being attached to the support member such that the antenna panel intersects the interrogation path; and control means in communication with the antenna loop for controlling said transmittal and receipt of the first and second electromagnetic fields by the antenna loop.
  • the antenna panel is substantially flexible and adapted to bend about at least a first axis when the object intersects the antenna region.
  • the antenna panel is substantially rigid and the support member includes at least one hinge connection that is adapted to hingedly engage the antenna panel, the antenna panel being adapted to rotate about the hinge connection when the object intersects the antenna region.
  • the antenna system includes a conveyor system adapted to transport at least one of the objects along the interrogation path.
  • the antenna system includes a conveyor antenna disposed proximate the interrogation path.
  • the conveyor antenna is adapted to transmit at least a third electromagnetic field and receive at least a fourth electromagnetic field, the third and fourth electromagnetic fields being directed substantially perpendicular to the interrogation path.
  • the antenna system comprises a support system having a first substantially vertical support member and a second substantially vertical support member; first and second antenna panels, the first antenna panel including at least a first substantially continuous antenna loop for transmitting at least a first electromagnetic field and receiving at least a second electromagnetic field, the second antenna panel including at least a second substantially continuous antenna loop for transmitting at least a third electromagnetic field and receiving at least a fourth electromagnetic field; the first and second antenna panels being substantially rectangular in shape and including first and second vertical edge regions, the first antenna panel first vertical region being engaged to the first vertical support member and the second antenna first vertical region being engaged to the second vertical support member, whereby the first and second antenna panels define an antenna region, the antenna region intersecting the interrogation path.
  • the first and second antenna panels are substantially flexible.
  • the first flexible antenna panel is rigidly engaged to the first vertical support member and the second flexible antemia panel is rigidly engaged to the second vertical support member, the first flexible antenna panel being adapted to bend about at least a first axis when an object intersects the antemia region and the second flexible antenna panel being adapted to bend about at least a second axis when an object intersects the antemia region.
  • the first and second antenna panels are substantially rigid.
  • the first rigid antenna panel is hingedly connected to the first vertical support member and the second rigid antenna panel is hingedly connected to the second vertical support member, the first and second rigid antenna panels being adapted to rotate about the hinge connections when an object intersects the antenna region.
  • the antenna system similarly includes a conveyor antenna disposed proximate the interrogation path, the conveyor antenna being adapted to transmit at least a fifth electromagnetic field and receive at least a sixth electromagnetic field, the fifth and sixth electromagnetic fields intersecting the interrogation path.
  • the RFID antenna system comprises at least one antenna panel system (as described herein) disposed in the entrance to a building, the antenna panel, if flexible, being adapted to bend about a first axis when an object passes through the building entrance or, if rigid, rotate about a hinge connection when an object passes through the building entrance.
  • the RFID antenna system comprises at least one antenna panel system (as described herein) disposed in the entrance to a transport vehicle (e.g., cargo truck, trailer), the antenna panel, if flexible, being adapted to bend about a first axis when an object passes through the entrance or, if rigid, rotate about a hinge connection when an object passes through the entrance.
  • a transport vehicle e.g., cargo truck, trailer
  • FIGURE 1 is a schematic illustration of a typical RFID system
  • FIGURE 2 is a perspective view of one embodiment of the flexible RFID antenna system, according to the invention
  • FIGURE 3 is a front plan view of the RFID antenna system shown in FIGURE 2;
  • FIGURE 4 is an exploded perspective view of one embodiment of the flexible RFID antenna panel, according to the invention;
  • FIGURE 5 is a partial section view of the antenna panel shown in FIGURE 4;
  • FIGURE 6 is a perspective view of a further embodiment of a RFID antemia system employing two flexible antenna panels, according to the invention.
  • FIGURE 7 is a front plan view of the RFID antenna system shown in FIGURE 6;
  • FIGURE 8 is a perspective view of a further embodiment of a RFID antenna system employing two RFID antenna subsystems, according to the invention;
  • FIGURE 9 is a schematic illustration of a flexible RFID antenna system incorporated into a building entrance, according to the invention;
  • FIGURE 10 is a schematic illustration of a flexible RFID antenna system retrofitted into a trailer, according to the invention.
  • FIGURE 11 is a schematic illustration of a flexible RFID antenna system retrofitted into a cargo truck, according to the invention.
  • a flexible antenna panel is disposed proximate the interrogation path for interrogating transponders disposed on objects moving along the interrogation path.
  • the antenna panel is preferably oriented such that the plane defined the antenna panel intersects the interrogation path.
  • the antenna panel is further adapted to bend about at least a first axis when an object (with a transponder thereon) intersects the plane defined by the panel.
  • the system typically comprises one or more transponder or tags 10, at least one antenna 12 to communicate with the tags 10, and a controller 14 for managing the communications interface.
  • the host system (i.e., computer) 16 interfaces with the controller 14 and directs the inteiTogation of the tags 10 disposed on or embedded in the product carriers 11 and any following action via parallel, serial or bus communications 18.
  • each antenna 12 is disposed on one side of the interrogation path, denoted by Arrows A,-A 4 , which is defined by the conveyor 5.
  • the RF link 17 and, hence, active RF zone is limited.
  • active RF zone it is meant to mean the zone defined by the effective RF radiation or electro-magnetic field component.
  • FIG. 2 there is shown one embodiment of the RFID antenna system 30 of the invention.
  • a key feature of the present invention is the capability of the antenna system 30 to be positioned proximate to or incorporated into a conveyor system 5.
  • the antenna system 30 is disposed proximate the interrogation path of the conveyor system 5, denoted by Arrow I, for interrogating the tags 10 and, hence, products or product carriers 11a, l ib, moving along the interrogation path.
  • the antenna panels of the invention can also be secured (hingedly or rigidly) to a ceiling above the interrogation path.
  • the antenna system 30 includes (i) a conveyor system 5 adapted to move the product carriers 11a, 1 lb (or products) with tags 10 disposed thereon along the interrogation path (denoted by Arrow I) that is, in this instance, defined by the conveyor system 5, (ii) an antenna support 32 having at least first and second side supports 34, 36 and a top member 38 attachable to the side supports 34,
  • At least one antenna panel 20 having at least one antenna loop 25 (see Fig. 4) adapted to transmit and receive electromagnetic fields (i.e., provide an active RF zone), and (iv) an antenna head assembly (i.e., reader/writer) 40.
  • the antenna panel 20 can be constructed of substantially rigid or flexible material. In a preferred embodiment of the invention, the antenna panel 20 is substantially flexible.
  • the antenna system 30 can, if desired, include a RFID conveyor antenna 31 to further enhance the active RF zone provided by the system 30. Details of the noted RFID conveyor antenna are set forth in U.S. Pat. No. 5,929,760, which is incorporated by reference herein.
  • the conveyor antenna 31 is preferably disposed proximate an interrogation path and is positioned (and adapted) to transmit and receive electromagnetic fields (and, hence provide a further active RF zone) that intersect the interrogation path.
  • the electromagnetic fields provided by the conveyor antenna 31 substantially intersect the interrogation path.
  • the antenna support 32 includes at least one, preferably two antenna panel connectors 33a, 33b adapted to engage and comiect the top portion 22 of the flexible antenna panel 20 to the top antenna support member 38 such that (i) the plane defined by the panel 20 (shown in phantom and denoted 23) intersects the interrogation path (and, hence, defines an antenna region) and (ii) the flexible antenna panel 20 is allowed to bend about at least one panel axis (denoted X) disposed proximate the top portion 22 thereof when a product carrier 11a, 1 lb (or product) intersects the plane 23 (or antenna region) defined by the panel 20.
  • the antemia panel 20 is disposed substantially perpendicular to and intersects the interrogation path.
  • the panel 20 is also adapted to bend about its body to accommodate a multitude of different size and shape product carriers 1 la, 1 lb (and products).
  • the antenna support 32 can comprise various lightweight materials, such acrylonitrile butadiene-styrene (ABS), polycarbonate, or poly vinyl chloride (PVC).
  • ABS acrylonitrile butadiene-styrene
  • PVC poly vinyl chloride
  • the support 32 material must, however, provide minimal interference and/or restriction of the antenna RF radiation or electromagnetic field.
  • the panel connectors comprise conventional hinge connectors that are adapted to hingedly engage the antenna panel 20.
  • the antenna panels 20 can be either substantially flexible or rigid, preferably, substantially rigid, and would rotate (i.e., swing open) when a product carrier (e.g., 11a) intersects the plane defined by the panel 20.
  • the hinge connectors can be attached to an antenna support, such as support member 38 shown in Fig. 2, the ceiling above the conveyor system 5, the top of an entrance to a building (e.g., header), such as illustrated in Fig. 9, or the top of the entrance (or ceiling) of a transport vehicle, such as the cargo truck and trailer illustrated in Figs. 10 and 11.
  • an antenna support such as support member 38 shown in Fig. 2, the ceiling above the conveyor system 5, the top of an entrance to a building (e.g., header), such as illustrated in Fig. 9, or the top of the entrance (or ceiling) of a transport vehicle, such as the cargo truck and trailer illustrated in Figs. 10 and 11.
  • the antenna head assembly 40 which includes the antenna logic and associated circuitry for the antenna system 30, is operatively connected to the antenna panel 20 and conveyor antenna 31.
  • the head assembly 40 comprises a LRP820 Reader/Writer.
  • the noted device is manufactured and distributed by Escort
  • the antemia panel 20 and conveyor antenna 31 are designed and adapted to provide 100-ohms of impedance and are connected in parallel to achieve a 50-ohm load.
  • a power splitter is employed. Because of the close proximity that the antenna system 30 provides, read range is not critical and a smaller tag 10 can be used. Single or multiple tag commands can thus be sent to the head assembly 40 and both antennas 20, 31 will read either the tag 10 placed on the top of the carrier or carriers 11a, 1 lb or a tag placed on the bottom (not shown).
  • the RFID antenna systems of the present invention include all the circuitry necessary to convert the digital signals received from a controller to high speed RF signals for the transponder tags, and conversely to convert the RF signals from the tags back into digital signals for the controller, numerous controllers can be employed with the antenna panel 20 and conveyor antenna 31.
  • the panel 20 includes first and second substantially flexible panel members 24a, 24b and at least one antenna loop (or circuit) 25.
  • the panel members 24a, 24b are constructed of a substantially rigid material.
  • the antemia loop 25 is adapted to provide an effective RF zone, more preferably transmit at least a first electromagnetic field and receive at least a second electromagnetic field.
  • the panel members 24a, 24b are substantially planar and are preferably laminated together by conventional means with the antenna loop 25 disposed therebetween.
  • one panel member e.g., 24a
  • having at least one antenna loop or circuit disposed on at least one surface thereof is employed.
  • the panel members 24a, 24b can comprise various shapes (e.g., square, oblong, semi-circular, etc.) and dimensions, and be constructed of various flexible or rigid materials.
  • the panel members 24a, 24b are substantially planar, substantially rectangular in shape and constructed of commercial grade NeopreneTM.
  • the panel member(s) material and thickness thereof should be selected to provide the least resistance to the product carrier's movement along the interrogation path.
  • Figs. 6 and 7 there is shown an additional embodiment of the antenna system, designated 50.
  • at least two flexible antenna panels 60, 62 and, if desired, the antenna conveyor 31 are employed.
  • each panel 60, 62 is hingedly connected to the first and second side supports 34, 36 by conventional means.
  • the panels 60, 62 are preferably oriented such that the planes defined by the panels 60, 62 (shown in phantom and designated 63a, 63b, respectively) are substantially perpendicular to and preferably intersect the interrogation path.
  • the planes 63a, 63b are substantially coincident and, hence, define an antenna region 63c. As illustrated in Fig.
  • the antenna panels 60, 62 are further adapted to rotate about the hinge connections 64a, 64b when a product carrier 1 la, 1 lb or product intersects the planes 63a and 63b defined by the panels 60, 62.
  • the panel members 24a, 24b shown in Fig. 4 can be constructed of a substantially flexible material or a substantially rigid material, such as ABS.
  • each hinge connection 64a, 64b includes conventional biasing means to provide an adjustable closing force (or moment) to the hinge connections 64a, 64b and, hence, panels 60, 62.
  • the panels 60, 62 are rigidly connected to the side supports 34, 36 via panel connectors similar to the panel connectors
  • the antenna panels 60, 62 would be constructed of a substantially flexible material and, hence, bend upon contact with a product carrier or carriers (e.g., 1 la, 1 lb) providing a path therebetween.
  • a product carrier or carriers e.g., 1 la, 1 lb
  • the antenna system 50 shown in Fig. 6 includes an upper panel, such as antenna panel 20 shown in
  • the upper antenna panel can be substantially flexible or rigid.
  • the upper antenna panel would similarly be connected to the top antenna support member 38 or ceiling above the antenna system 5 and adapted to bend or rotate (depending on the antenna panel material) open upon contact with a product carrier (e.g., 11a).
  • a product carrier e.g. 11a
  • FIG. 8 there is shown yet another embodiment of the RFID antenna system 70 of the invention. As illustrated in Fig. 8, the antenna system 70 employs the single and dual panel antenna systems 30, 50, as described above.
  • the antenna systems 30, 50 can be disposed on or incorporated into the conveyor system 5 in any order, proximate to each other or at a substantial distance apart. Further, a single antenna head assembly 40 or multiple head assemblies can be employed.
  • the illustrated antemia system 30 ensures that a RFID tagged carriers l ie and/or items will be interrogated and tracked whenever they leave or enter the building 80.
  • the system 30 also facilitates tracking of RFID tagged carriers l ie and items when they are stored on a loading dock 82, for example, prior to warehousing or loading onto a transport device 83.
  • antenna system 50 shown in Figs. 6 and 7 can be incorporated into the building entrance 81. Antenna system 50 would similarly facilitate tracking of tagged carriers l ie and items that are transported through the building entrance 81.
  • the antenna systems 30, 50 can also be employed with a modular RFID antenna system 90 disposed at the building entrance 81 to enhance the active RF zone. Details of the modular antenna system 90 are set forth in Co-Pending Application S/N 09/925,129, filed August 8, 2001, which is incorporated by reference herein.
  • the antenna system 30 includes a modular antenna system 90 that are powered by external battery (not shown).
  • the antenna systems 30, 90 are powered by the electrical or battery system of the tractor-trailer.
  • the RFID antenna system 30 of the invention can also be retrofitted into a cargo truck 102, with a modular antenna system 90 or without.
  • the antenna system 30 is preferably powered by an existing vehicle battery.
  • the antenna system 30 communicates with tagged items (product carriers 11, products, etc.) as they are loaded to and unloaded from the trailer 100 or truck 102, allowing accurate tracking of the tagged items throughout the transport chain.
  • the system can be used with any suitable transport vehicle.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Support Of Aerials (AREA)

Abstract

L'invention concerne un système d'antenne d'identification par radiofréquence (RFID) permettant de communiquer avec au moins un transpondeur (10) placé sur un objet (11) (par ex. un support de produit, un produit, etc.) mobile le long d'un trajet d'interrogation (I). Ce système comprend au moins un panneau d'antenne (20, 60, 62) qui définit une région d'antenne (23, 63c). Le panneau d'antenne contient au moins une boucle d'antenne sensiblement continue (25) afin de transmettre et recevoir des champs magnétiques, ce panneau d'antenne étant orienté de façon à croiser le trajet d'interrogation. Ce panneau d'antenne peut être sensiblement flexible ou rigide.
PCT/US2002/032723 2001-10-13 2002-10-10 Systeme et panneau d'antenne rfid flexible WO2003034360A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US32905301P 2001-10-13 2001-10-13
US60/329,053 2001-10-13

Publications (1)

Publication Number Publication Date
WO2003034360A1 true WO2003034360A1 (fr) 2003-04-24

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PCT/US2002/032723 WO2003034360A1 (fr) 2001-10-13 2002-10-10 Systeme et panneau d'antenne rfid flexible

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2914085A1 (fr) * 2007-03-23 2008-09-26 Ier Sa Dispositif de detection du passage d'objets portant une etiquette rfid,procede et systeme utilisant un tel dispositif.
EP2014606A1 (fr) * 2007-07-11 2009-01-14 Jungheinrich Aktiengesellschaft Chariot de manutention doté d'au moins une antenne destinée à l'émission et la réception de données
FR2928762A1 (fr) * 2008-03-14 2009-09-18 Ier Sa Dispositif et systeme de detection de passage d'objets, personnes ou animaux portant une etiquette rfid, dans l'ordre de passage et application a la detection de bagages
EP3432193A1 (fr) * 2017-07-18 2019-01-23 Toshiba Tec Kabushiki Kaisha Appareil de lecture d'étiquettes sans fil

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5221831A (en) * 1991-11-29 1993-06-22 Indala Corporation Flap-type portal reader
US5929760A (en) * 1997-10-20 1999-07-27 Escort Memory Systems RFID conveyor antenna
US6218942B1 (en) * 1995-10-11 2001-04-17 Motorola, Inc. Radio frequency identification tag exciter/reader

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5221831A (en) * 1991-11-29 1993-06-22 Indala Corporation Flap-type portal reader
US6218942B1 (en) * 1995-10-11 2001-04-17 Motorola, Inc. Radio frequency identification tag exciter/reader
US5929760A (en) * 1997-10-20 1999-07-27 Escort Memory Systems RFID conveyor antenna

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2914085A1 (fr) * 2007-03-23 2008-09-26 Ier Sa Dispositif de detection du passage d'objets portant une etiquette rfid,procede et systeme utilisant un tel dispositif.
WO2008116976A1 (fr) 2007-03-23 2008-10-02 I.E.R. Dispositif de détection du passage d'objets portant une étiquette rfid, procédé et système utilisant un tel dispositif
US8378818B2 (en) 2007-03-23 2013-02-19 I.E.R. Device for detecting the passage of objects with a RFID label, method and system using such device
EP2014606A1 (fr) * 2007-07-11 2009-01-14 Jungheinrich Aktiengesellschaft Chariot de manutention doté d'au moins une antenne destinée à l'émission et la réception de données
US7800548B2 (en) 2007-07-11 2010-09-21 Jungheinrich Aktiengesellschaft Industrial truck with at least one antenna for sending and receiving data
FR2928762A1 (fr) * 2008-03-14 2009-09-18 Ier Sa Dispositif et systeme de detection de passage d'objets, personnes ou animaux portant une etiquette rfid, dans l'ordre de passage et application a la detection de bagages
WO2009115742A3 (fr) * 2008-03-14 2010-01-07 Ier Dispositif et système de détection de passage d'objets, personnes ou animaux portant une étiquette rfid, dans l'ordre de passage et application à la détection de bagages
EP3432193A1 (fr) * 2017-07-18 2019-01-23 Toshiba Tec Kabushiki Kaisha Appareil de lecture d'étiquettes sans fil

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