WO2015108426A1 - An antenna for detecting rfid tags - Google Patents

An antenna for detecting rfid tags Download PDF

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Publication number
WO2015108426A1
WO2015108426A1 PCT/NO2015/050011 NO2015050011W WO2015108426A1 WO 2015108426 A1 WO2015108426 A1 WO 2015108426A1 NO 2015050011 W NO2015050011 W NO 2015050011W WO 2015108426 A1 WO2015108426 A1 WO 2015108426A1
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WO
WIPO (PCT)
Prior art keywords
antenna
arm
parallel
rfid tags
arms
Prior art date
Application number
PCT/NO2015/050011
Other languages
French (fr)
Inventor
Halvor Halvorsen
Christophe TARAYE
Original Assignee
Trac-Id Systems As
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 Trac-Id Systems As filed Critical Trac-Id Systems As
Publication of WO2015108426A1 publication Critical patent/WO2015108426A1/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06K7/10316—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 using at least one antenna particularly designed for interrogating the wireless record carriers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06K7/10316—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 using at least one antenna particularly designed for interrogating the wireless record carriers
    • G06K7/10336—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 using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the near field type, inductive coil
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • 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
    • 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 present invention relates to an antenna intended to be used in a reader station for RFID tags (transponders).
  • the reader antenna is often a loop antenna with a single linear sensitivity axis.
  • the present invention relates to an antenna for detecting RFID tags, wherein the RFID tags are located in a first plane and the antenna is located in a second plane, the first plane being in the vicinity of and parallel to the second plane.
  • the antenna includes several non-parallel sensitivity axes in said second plane. This design significantly improves the antenna's ability of detecting RFID tags with unfavorable orientations. It is also an advantage to have such an antenna compared to using two separate antennas, each with a single sensitivity axis, as to cost, simplicity of design and a better defined coverage.
  • the inventive antenna may include a first elongate arm and a second elongate arm, both arms being located in said second plane, each arm including two parallel segments, the first arm being joined to the second arm with an angle between the arms which is less than 180°, the arms being shorted in their distal ends.
  • the angle between the arms is 90° .
  • a feeder may be connected to the first and second arms bisecting the angle between the arms.
  • the antenna may be tuned with a capacitor and/or inductor.
  • the antenna may tuned by means of tuning capacitors which are switched into circuit with switches controlled by a microprocessor.
  • the antenna may be mounted parallel with a conveyor transporting objects on which the RFID tags are mounted.
  • Fig. 1 is a top view of the antenna
  • Fig. 2 shows the interface between the antenna and the RFID reader
  • Fig. 3 shows the antenna installed in a reader station.
  • Fig. 1 shows the antenna 1 in top view.
  • the antenna is adapted to be mounted within range of the RFID units to be detected, e.g. above and parallel with a conveyor belt. It is designed to create an electro-magnetic signal activating the RFID units passing by on the conveyor, and receive the responding signals returned by the RFID transponders.
  • the antenna proper consists of a loop shaped as an arrow with two arms, the first arm being formed by the segments SI, S6, S5, while the second arm is formed by the segments S2, S3, S4.
  • the arms are oriented at an angle to each other.
  • the arms may be orientated relatively to each other including any angle between 0° and 180°, but the angle may preferably be 90° as shown in Fig. 1.
  • Each segment defines a sensitivity axis. As the segments are angled in relation to each other, the sensitivity axes are similarly angled.
  • the loop is fed symmetrically in the feed point 3 through a balanced open wire feeder F with two parallel wires Fl and F2.
  • the feeder F is terminated in a shielded box 5.
  • the box 5 includes first and second termination points PI and P2. Over the termination points there is connected a capacitor 7 tuning the antenna to a frequency in the LF or VLF unlicensed frequency band.
  • the capacitor may be supplemented with or replaced by an inductor to tune the antenna to a desired operating frequency.
  • the antenna appears as a parallel circuit.
  • the antenna 1 is connected to the reader circuit, Fig. 3, through a shielded cable 6. In Fig. 2 the antenna 1 is represented by a parallel resonance circuit.
  • the reader circuit includes a number of tuning capacitors 7 which is switched into the circuit with switches 8 controlled from a microprocessor 10.
  • the signal is demodulated in the demodulator 8 and filtered in the filter 9 before it is conducted to the microprocessor 10.
  • the microprocessor converts the information in the signal to standard serial data communication format, which is delivered on the output interface 11.
  • the digital signals may then be processed in downstream equipment for identifying the RFID tags.
  • the microprocessor 10 is also connected with a signal generator 12 providing the interrogating signal for the RFID tag.
  • the tags pass the reading antenna, they must be orientated in a direction securing that they are read. If a tag is orientated perpendicular to the antenna section it is passing, the signal will be at its minimum and often undetectable.
  • the tag will move further into the field of the antenna until it crosses a section of the antenna that is orientated with an angle, here 90°, to the first section and the reading will be successful.
  • the feeder F is 90° on the direction of transport and will detect tags oriented 45° to 135°
  • the segments S6, S2 and S4 are oriented 45° on the transport direction and will detect tags oriented from 0° to 90°
  • the segments SI, S5 and S3 are oriented 135° on the transport direction and will detect tags between 90° and 180°.
  • the antenna will detect tags in all angles between 0° and 180° over the whole width of the conveyor belt and with only one antenna.
  • each tag is read twice in non- coincident time. Thus, there will be no reading collisions for any two tags.
  • the antenna may be mounted above or below a transporter belt, as shown, but may also have other applications. It may be mounted in a port or narrow passage identifying or counting movable RFID tagged objects, e.g. animals, persons or machinery. It may be mounted in a floor for the identification of persons with RFID tagged shoes, for counting, identification or access control.
  • the geometry of the antenna means that all tags are read when passing the antenna, independent of the orientation of the tags.
  • the tags will pass the field two times, which means that horizontally separated tags passing the first field simultaneously will always pass the second field on different times. This will secure that all tags are read.
  • While the antenna shown in Fig. 1 has the feeder line connected in the apex between the segments S5 and S4, it may be connected in any convenient point providing the correct polarization.
  • An alternative configuration is to connect the feeder to the antenna in the apex between the segments SI and S2.
  • the antenna shown in the illustrations includes a single turn. However, in some instances it may be a benefit to use a multi-turn antenna.
  • the general configuration is identical with the embodiment shown in the figures, with the same orientation and segments etc.
  • the antenna includes a continuous wire wound several times around the circumference of the antenna, the ends of the wire being terminated in the feeder line.
  • the antenna unturned In some instances it may be advantageous to use the antenna unturned.
  • the bandwidth will be greatly increased, but the sensitivity will suffer.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • General Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Burglar Alarm Systems (AREA)
  • Support Of Aerials (AREA)

Abstract

There is disclosed an antenna for detecting RFID tags that are transported past the antenna. The antenna includes several non-parallel sensitivity axes. An embodiment of the antenna includes a first arm with first and third parallel segments (S5, SI) joined by a second segment (S6), a second arm with fourth and sixth parallel segments (S4, S2) joined by a fifth segment (S3), a wire line (F) with first (Fl) and second (F2) parallel wires, wherein the third section is connected to the fourth segment, the wire line is connected to the first and sixth segments, and the first arm forms an angle with the second arm, the wire line bisecting the angle. The antenna may find use in detecting RFID tags located in fish transported past the antenna on a conveyor mounted parallel to the antenna and with a transport direction normal to the wire line.

Description

N ANTENNA FOR DETECTING RFID TAGS
Field of the Invention
The present invention relates to an antenna intended to be used in a reader station for RFID tags (transponders).
Background
When RFID tags pass a reader or detector station with an arbitrary orientation, correct identification becomes uncertain. This may happen, e.g. if the RFID tags are installed in objects passing by the reader station on a conveyor belt, or if the RFID tags are installed in living animals. Reliable reading could be jeopardized if the RFID tag signal is perpendicular to the orientation of the reader antenna.
The reader antenna is often a loop antenna with a single linear sensitivity axis.
Lately, it has become of interest to install RFID tags in living fish, both in fish reared in fish farms and in wild fish for scientific reasons. In the fish processing facility, the fish will arrive on the conveyor in an arbitrary position, possible lying in several layers. It may then be challenging to obtain a reliable reading. The fish industry requires loss-free RFID reading.
At present this problem is solved by either introducing physical restrictions controlling the orientation of the objects, or by using several readers with different oriented antennas, or both. However, the use of a multitude of readers increases the complexity of the installation, and may introduce other problems, as it may be difficult to find the combined coverage of the antennas, thus creating blind zones.
Summary of the Invention
It is an object of the present invention to provide an antenna for a RFID reader which is effective independent of the orientation of the RFID tag. This is obtained in an antenna as claimed in the appended claims.
In particular, the present invention relates to an antenna for detecting RFID tags, wherein the RFID tags are located in a first plane and the antenna is located in a second plane, the first plane being in the vicinity of and parallel to the second plane. The antenna includes several non-parallel sensitivity axes in said second plane. This design significantly improves the antenna's ability of detecting RFID tags with unfavorable orientations. It is also an advantage to have such an antenna compared to using two separate antennas, each with a single sensitivity axis, as to cost, simplicity of design and a better defined coverage.
The inventive antenna may include a first elongate arm and a second elongate arm, both arms being located in said second plane, each arm including two parallel segments, the first arm being joined to the second arm with an angle between the arms which is less than 180°, the arms being shorted in their distal ends.
In a preferred embodiment of the antenna, the angle between the arms is 90° .
For feeding the inventive antenna, a feeder may be connected to the first and second arms bisecting the angle between the arms.
The antenna may be tuned with a capacitor and/or inductor.
The antenna may tuned by means of tuning capacitors which are switched into circuit with switches controlled by a microprocessor.
The antenna may be mounted parallel with a conveyor transporting objects on which the RFID tags are mounted.
Brief Description of the Drawings
Further features and advantages of the invention appear from the following detailed description, in which the invention is described with reference to the appended drawings, and wherein :
Fig. 1 is a top view of the antenna,
Fig. 2 shows the interface between the antenna and the RFID reader, and Fig. 3 shows the antenna installed in a reader station. Detailed Description
Fig. 1 shows the antenna 1 in top view. The antenna is adapted to be mounted within range of the RFID units to be detected, e.g. above and parallel with a conveyor belt. It is designed to create an electro-magnetic signal activating the RFID units passing by on the conveyor, and receive the responding signals returned by the RFID transponders. The antenna proper consists of a loop shaped as an arrow with two arms, the first arm being formed by the segments SI, S6, S5, while the second arm is formed by the segments S2, S3, S4. The arms are oriented at an angle to each other. The arms may be orientated relatively to each other including any angle between 0° and 180°, but the angle may preferably be 90° as shown in Fig. 1. Each segment defines a sensitivity axis. As the segments are angled in relation to each other, the sensitivity axes are similarly angled.
The loop is fed symmetrically in the feed point 3 through a balanced open wire feeder F with two parallel wires Fl and F2. The feeder F is terminated in a shielded box 5. The box 5 includes first and second termination points PI and P2. Over the termination points there is connected a capacitor 7 tuning the antenna to a frequency in the LF or VLF unlicensed frequency band. The capacitor may be supplemented with or replaced by an inductor to tune the antenna to a desired operating frequency. The antenna appears as a parallel circuit. The antenna 1 is connected to the reader circuit, Fig. 3, through a shielded cable 6. In Fig. 2 the antenna 1 is represented by a parallel resonance circuit. The reader circuit includes a number of tuning capacitors 7 which is switched into the circuit with switches 8 controlled from a microprocessor 10. The signal is demodulated in the demodulator 8 and filtered in the filter 9 before it is conducted to the microprocessor 10. The microprocessor converts the information in the signal to standard serial data communication format, which is delivered on the output interface 11. The digital signals may then be processed in downstream equipment for identifying the RFID tags. The microprocessor 10 is also connected with a signal generator 12 providing the interrogating signal for the RFID tag. When the tags pass the reading antenna, they must be orientated in a direction securing that they are read. If a tag is orientated perpendicular to the antenna section it is passing, the signal will be at its minimum and often undetectable. The tag will move further into the field of the antenna until it crosses a section of the antenna that is orientated with an angle, here 90°, to the first section and the reading will be successful. In particular, the feeder F is 90° on the direction of transport and will detect tags oriented 45° to 135°, the segments S6, S2 and S4 are oriented 45° on the transport direction and will detect tags oriented from 0° to 90°, and the segments SI, S5 and S3 are oriented 135° on the transport direction and will detect tags between 90° and 180°. In total the antenna will detect tags in all angles between 0° and 180° over the whole width of the conveyor belt and with only one antenna. It should also be noted that each tag is read twice in non- coincident time. Thus, there will be no reading collisions for any two tags.
The antenna may be mounted above or below a transporter belt, as shown, but may also have other applications. It may be mounted in a port or narrow passage identifying or counting movable RFID tagged objects, e.g. animals, persons or machinery. It may be mounted in a floor for the identification of persons with RFID tagged shoes, for counting, identification or access control.
The geometry of the antenna means that all tags are read when passing the antenna, independent of the orientation of the tags. The tags will pass the field two times, which means that horizontally separated tags passing the first field simultaneously will always pass the second field on different times. This will secure that all tags are read.
While the antenna shown in Fig. 1 has the feeder line connected in the apex between the segments S5 and S4, it may be connected in any convenient point providing the correct polarization. An alternative configuration is to connect the feeder to the antenna in the apex between the segments SI and S2.
The antenna shown in the illustrations includes a single turn. However, in some instances it may be a benefit to use a multi-turn antenna. The general configuration is identical with the embodiment shown in the figures, with the same orientation and segments etc. The antenna includes a continuous wire wound several times around the circumference of the antenna, the ends of the wire being terminated in the feeder line.
In some instances it may be advantageous to use the antenna unturned. The bandwidth will be greatly increased, but the sensitivity will suffer.

Claims

C l a i m s
An antenna for detecting RFID tags, wherein the RFID tags are located in a first plane and the antenna is located in a second plane, the first plane being in the vicinity of and parallel to the second plane,
c h a r a c t e r i z e d i n that the antenna includes several non- parallel sensitivity axes in said second plane.
An antenna according to claim 1, wherein the antenna includes a first elongate arm and a second elongate arm, both arms being located in said second plane, each arm including two parallel segments (S5, SI ; S2, S4), the first arm being joined to the second arm with an angle between the arms which is less than 180°, the arms being shorted in their distal ends.
3. An antenna according to claim 2, wherein the angle between the arms is
An antenna according to claim 2, wherein a feeder (LI, L2) is connected to the first and second arms bisecting the angle between the arms.
An antenna according to claim 2, wherein the antenna is tuned with a capacitor (7) and/or inductor.
An antenna according to claim 2, wherein the antenna is tuned by means of tuning capacitors (7) which are switched into circuit with switches (8) controlled by a microprocessor (10).
7. An antenna according to any of the preceding claims, wherein the antenna is mounted parallel with a conveyor transporting objects on which the RFID tags are mounted.
PCT/NO2015/050011 2014-01-17 2015-01-19 An antenna for detecting rfid tags WO2015108426A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20140060 2014-01-17
NO20140060A NO20140060A1 (en) 2014-01-17 2014-01-17 Antenna for RFID chip detection

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WO2015108426A1 true WO2015108426A1 (en) 2015-07-23

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995028748A1 (en) * 1994-04-18 1995-10-26 Finlayson, Dorothy, Elizabeth Antenna arrangement
WO1998031070A1 (en) * 1997-01-14 1998-07-16 Checkpoint Systems, Inc. Multiple loop antenna
EP1724873A1 (en) * 2005-05-11 2006-11-22 Hitachi Kokusai Electric Inc. Reader/writer apparatus
EP1793326A2 (en) * 2002-01-09 2007-06-06 Vue Technology, Inc. Intelligent station using multiple RF antennae and inventory control system and method incorporating same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995028748A1 (en) * 1994-04-18 1995-10-26 Finlayson, Dorothy, Elizabeth Antenna arrangement
WO1998031070A1 (en) * 1997-01-14 1998-07-16 Checkpoint Systems, Inc. Multiple loop antenna
EP1793326A2 (en) * 2002-01-09 2007-06-06 Vue Technology, Inc. Intelligent station using multiple RF antennae and inventory control system and method incorporating same
EP1724873A1 (en) * 2005-05-11 2006-11-22 Hitachi Kokusai Electric Inc. Reader/writer apparatus

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Publication number Publication date
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