NO20140060A1 - Antenna for RFID chip detection - Google Patents

Antenna for RFID chip detection Download PDF

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Publication number
NO20140060A1
NO20140060A1 NO20140060A NO20140060A NO20140060A1 NO 20140060 A1 NO20140060 A1 NO 20140060A1 NO 20140060 A NO20140060 A NO 20140060A NO 20140060 A NO20140060 A NO 20140060A NO 20140060 A1 NO20140060 A1 NO 20140060A1
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NO
Norway
Prior art keywords
antenna
segments
arm
segment
angle
Prior art date
Application number
NO20140060A
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Norwegian (no)
Inventor
Halvor Halvorsen
Christophe Taraye
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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.)
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Publication date
Application filed by Trac Id Systems As filed Critical Trac Id Systems As
Priority to NO20140060A priority Critical patent/NO20140060A1/en
Priority to PCT/NO2015/050011 priority patent/WO2015108426A1/en
Publication of NO20140060A1 publication Critical patent/NO20140060A1/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

Description

Oppfinnelsens område Field of the invention

Foreliggende oppfinnelse vedrører en antenne beregnet på bruk i en lesestasjon for RFID-brikker (transpondere). The present invention relates to an antenna intended for use in a reading station for RFID tags (transponders).

Bakgrunn Background

Når RFID-brikker passerer en leser- eller detektorstasjon med en tilfeldig orientering, blir korrekt identifikasjon usikker. Dette kan for eksempel skje hvis RFID-brikkene er installert i objekter som passerer lesestasjonen på et transportbelte, eller om RFID-brikkene er installer i levende dyr. Det kan være vanskelig å oppnå pålitelig lesing hvis RFID-brikkens signal er perpendikulært på orienteringen av leseantennen. When RFID chips pass a reader or detector station with a random orientation, correct identification becomes uncertain. This can happen, for example, if the RFID chips are installed in objects that pass the reading station on a conveyor belt, or if the RFID chips are installed in living animals. It can be difficult to achieve reliable reading if the RFID tag's signal is perpendicular to the orientation of the reader antenna.

Leseantennen er ofte en sløyfeantenne (loop antenna) med en enkelt lineær følsomhetsakse. The reading antenna is often a loop antenna with a single linear sensitivity axis.

I det senere har det blitt aktuelt å installere RFID-brikker i levende fisk, både fisk som oppdrettes i fireoppdrettsanlegg, og i vill fisk for vitenskapelige formål. I fiskeforedlingsanlegg vil fisken ankomme på transportbeltet i en tilfeldig posisjon, og kanskje ligge i flere lag. Det kan da være utfordrende å oppnå en pålitelig avlesning. Fiskeindustrien krever tapsfri RFID-lesing. In the latter, it has become relevant to install RFID tags in live fish, both fish reared in aquaculture facilities and in wild fish for scientific purposes. In fish processing plants, the fish will arrive on the conveyor belt in a random position, and perhaps lie in several layers. It can then be challenging to obtain a reliable reading. The fishing industry requires lossless RFID reading.

I dag blir dette problemet løst ved enten å introdusere fysiske begrensninger som kontrollerer orienteringen av objektene, eller ved å bruke flere lesere med antenner med forskjellig orientering, eller begge deler. Bruk av flere lesere vil imidlertid gjøre installasjonen mer komplisert, og kan introdusere andre problemer, etter som det kan være vanskelig å finne den kombinerte dekningen til antennene, og slik skape blindsoner. Today, this problem is solved by either introducing physical constraints that control the orientation of the objects, or by using multiple readers with antennas of different orientations, or both. However, the use of multiple readers will make the installation more complicated, and may introduce other problems, after which it may be difficult to find the combined coverage of the antennas, thus creating blind spots.

Sammenfatning av oppfinnelsen Summary of the Invention

Det er en hensikt med foreliggende oppfinnelse å tilveiebringe en antenne for en RFID-leser som er effektiv uavhengig av orienteringen til RFID-brikkene. Dette oppnås i en antenne som angitt i de vedføyde patentkravene. It is an aim of the present invention to provide an antenna for an RFID reader which is effective regardless of the orientation of the RFID chips. This is achieved in an antenna as stated in the appended patent claims.

Kortfattet beskrivelse av tegningene Brief description of the drawings

Ytterligere egenskaper og fordeler ved oppfinnelsen fremgår av den etterfølgende detaljerte beskrivelse, hvor oppfinnelsen beskrives med henvisning til de vedføyde tegninger, og hvor: Further properties and advantages of the invention appear in the following detailed description, where the invention is described with reference to the attached drawings, and where:

Fig. 1 viser antennen sett fra oven, Fig. 1 shows the antenna seen from above,

Fig. 2 viser grensesnittet mellom antennen og RFID-lese ren, og Fig. 2 shows the interface between the antenna and the RFID reader, and

Fig. 3 viser antennen installert i en lesestasjon. Fig. 3 shows the antenna installed in a reading station.

Detaljert beskrivelse Detailed description

Fig. 1 viser antennen 1 sett fra oven. Antennen er innrettet til å monteres innen området for RFID-enhetene som skal detekteres, for eksempel over og parallelt med et transportbelte. Den er konstruert til å frembringe et elektromagnetisk signal som aktiverer RFID-enhetene som passerer på transportbeltet, og motta svarsignalene returnert av RFID-transponderne. Selve antennen består av en sløyfe formet som en pil med to armer, idet den første armen er dannet av segmentene Sl, S6, S5, mens den andre armen er dannet av segmentene S2, S3, S4. Delene er orientert i en vinkel til hverandre. Vinkelen kan fortrinnsvis være 90°. Hver arm definerer en følsomhetsakse. Ettersom armene er vinklet i forhold til hverandre, er følsomhetsaksene tilsvarende vinklet. Fig. 1 shows the antenna 1 seen from above. The antenna is designed to be mounted within the area of the RFID units to be detected, for example above and parallel to a conveyor belt. It is designed to generate an electromagnetic signal that activates the RFID devices passing on the conveyor belt, and receive the response signals returned by the RFID transponders. The antenna itself consists of a loop shaped like an arrow with two arms, the first arm being formed by the segments Sl, S6, S5, while the second arm is formed by the segments S2, S3, S4. The parts are oriented at an angle to each other. The angle can preferably be 90°. Each arm defines a sensitivity axis. As the arms are angled relative to each other, the sensitivity axes are correspondingly angled.

Sløyfen fødes symmetrisk i fødepunktet 3 gjennom en balansert åpen tråd fødeledning F med to parallelle tråder Fl og F2. Fødeledningen F er terminert i en skjermet boks 5. Boksen 5 inkluderer første og andre termineringspunkter Pl og P2. Over termineringspunktene er det koblet en kondensator / som avstemmer antennen til en frekvens i et LF eller VLF ulisensiert frekvensbånd. Kondensatoren kan være supplementert med eller erstattet av en spole for å avstemme antennen til en ønsket operasjonsfrekvens. Antennen fremstår som en parallellkrets. The loop is fed symmetrically in the feed point 3 through a balanced open wire feed line F with two parallel wires Fl and F2. The feeder line F is terminated in a shielded box 5. The box 5 includes first and second termination points Pl and P2. A capacitor is connected above the termination points / which tunes the antenna to a frequency in an 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.

Antennen 1 er koblet til lesekretsen, Fig. 3, gjennom en skjermet kabel 6. I The antenna 1 is connected to the reading circuit, Fig. 3, through a shielded cable 6. I

Fig. 2 er antennen representert av en parallellresonanskrets. Lesekretsen inkluderer et antall avstemmingskondensatorer 7 som svitsjes inn i kretsen med svitsjer 8 kontrollert av en mikroprosessor 10. Signalet demoduleres i demodulatoren 8 og filtreres i filteret 9 før det ledes til mikroprosessoren 10. Mikroprosessoren konverterer informasjonen i signalet til standard serielt Fig. 2 shows the antenna represented by a parallel resonant circuit. The reading circuit includes a number of tuning capacitors 7 which are switched into the circuit with switches 8 controlled by a microprocessor 10. The signal is demodulated in the demodulator 8 and filtered in the filter 9 before being passed to the microprocessor 10. The microprocessor converts the information in the signal to standard serial

datakommunikasjonsformat, her RS232/RS485, som leveres på utgangsgrensesnittet 11. De digitale signalene kan deretter prosesseres i nedstrøms utstyr for indentifisering av RFID-brikkene. Mikroprosessoren 10 er også koblet til en signalgenerator 12 som tilveiebringer spørresignalet for RFID-brikken. data communication format, here RS232/RS485, which is delivered on the output interface 11. The digital signals can then be processed in downstream equipment for identification of the RFID tags. The microprocessor 10 is also connected to a signal generator 12 which provides the query signal for the RFID chip.

Når brikkene passerer leseantennen må de være orientert i en retning som sikrer at de blir lest. Hvis en brikke er orientert perpendikulært på antenneseksjonen som den passerer, vil signalet være på et minimum og ofte ikke detekterbart. Brikken vil bevege seg videre inn i feltet til antennen inntil den krysser en seksjon av antennen som er orientert med en vinkel, her 90°, på den første seksjonen og avlesningen vil bli vellykket. Nærmere bestemt er fødeledningen F 90° på transportretningen og vil detektere brikker orientert 45° til 135°, segmentene S6, S2 og S4 er orientert 45° på transportretningen og vil detektere brikker orientert fra 0° til 90°, og segmentene Sl, S5 og S3 er orientert 135° på transportretningen og vil detektere brikker mellom 90° og 180°. Samlet vil antennen detektere brikker i alle vinkler mellom 0° og 180° over hele bredden av transportbeltet og med bare en antenne. Legg også merke til at hver brikke leses to ganger i ikke sammenfallende tid. Det vil derfor ikke være noen lesekollisjoner for enhver to brikker. When the chips pass the reading antenna, they must be oriented in a direction that ensures that they are read. If a chip is oriented perpendicular to the antenna section that it passes, the signal will be at a minimum and often not detectable. The chip will move further into the field of the antenna until it crosses a section of the antenna that is oriented at an angle, here 90°, on the first section and the reading will be successful. More specifically, the feed line F is 90° to the transport direction and will detect chips oriented 45° to 135°, segments S6, S2 and S4 are oriented 45° to the transport direction and will detect chips oriented from 0° to 90°, and segments Sl, S5 and S3 is oriented 135° to the transport direction and will detect pieces between 90° and 180°. Overall, the antenna will detect chips at all angles between 0° and 180° across the entire width of the conveyor belt and with just one antenna. Also note that each chip is read twice in non-coincident time. There will therefore be no read collisions for any two chips.

Antennen kan monteres over eller under et transportbelte, som vist, men kan også ha andre anvendelsesområder. Den kan monteres i en port eller smal passasje for å identifisere eller lese bevegelige RFID-merkede objekter, for eksempel dyr, personer eller maskiner. Den kan monteres i et gulv for identifikasjoner med RFID-merkede sko, for telling, identifikasjon eller adgangskontroll. The antenna can be mounted above or below a conveyor belt, as shown, but can also have other areas of application. It can be mounted in a gate or narrow passage to identify or read moving RFID-tagged objects, such as animals, people or machines. It can be mounted in a floor for identifications with RFID-tagged shoes, for counting, identification or access control.

Antennens geometri betyr at alle brikkene leses når de passerer antennen, uavhengig av orienteringen til brikkene. Brikkene vil passere feltet to ganger, hvilket betyr at horisontalt adskilte brikker som passerer det første feltet samtidig vil passere det andre feltet på forskjellige tidspunkt. Dette vil sikre at alle brikkene leses. The geometry of the antenna means that all the chips are read when they pass the antenna, regardless of the orientation of the chips. The pieces will pass the field twice, which means that horizontally separated pieces that pass the first field at the same time will pass the second field at different times. This will ensure that all the chips are read.

Mens antennen vist i Fig. 1 har fødeledningen tilkoblet i spissen mellom segmentene S5 og S4, kan den tilkoblet i ethvert egnet punkt som gir korrekt polarisasjon. En alternativ konfigurasjon er å koble fødeledningen til antennen i spissen mellom segmentene Sl og S2. While the antenna shown in Fig. 1 has the feed line connected at the tip between segments S5 and S4, it can be connected at any suitable point which gives correct polarization. An alternative configuration is to connect the feed line to the antenna at the tip between segments Sl and S2.

Antennen vist i illustrasjonene inkluderer en enkelt vinding. I noen tilfeller kan det imidlertid være en fordel å bruke en antenne med flere vindinger. Den generelle konfigurasjonen er identisk med utførelsene vist i figurene, med den samme orienteringen og segmenter osv. Antennen inkluderer en kontinuerlig tråd viklet flere ganger rundt omkretsen av antennen, idet endene av tråden er terminert i fødeledningen. The antenna shown in the illustrations includes a single winding. In some cases, however, it may be advantageous to use an antenna with several turns. The general configuration is identical to the embodiments 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 terminating in the feed line.

I noen tilfeller vil det være fordelaktig å bruke antennen uavstemt. Båndbredden vil bli sterkt utøket, men følsomheten vil bli dårligere. In some cases it will be advantageous to use the antenna untuned. The bandwidth will be greatly increased, but the sensitivity will be worse.

Claims (9)

1. Antenne for deteksjon av RFID-brikker lokalisert nær antennen,karakterisert vedat antennen inkluderer flere ikke parallelle følsom hetsa kser.1. Antenna for detection of RFID tags located near the antenna, characterized in that the antenna includes several non-parallel sensitive objects. 2. Antenne ifølge krav 1, hvor antennen inkluderer en første arm med første og tredje parallelle segmenter (S5, Sl) koblet sammen av et andre segment (S6), en andre arm med fjerde og sjette parallelle segmenter (S2, S4) koblet sammen av et femte segment (S3), hvor den første armen er tilknyttet den andre armen.2. Antenna according to claim 1, where the antenna includes a first arm with first and third parallel segments (S5, Sl) connected by a second segment (S6), a second arm with fourth and sixth parallel segments (S2, S4) connected by a fifth segment (S3), where the first arm is connected to the second arm. 3. Antenne ifølge krav 2, hvor den første armen er knyttet til den andre armen ved at det tredje segmentet (Sl) er koblet det fjerde segmentet (S2), idet en fødeledning (Fl, F2) er koblet mellom de første (S5) og fjerde (S2) segmentene.3. Antenna according to claim 2, where the first arm is connected to the second arm in that the third segment (S1) is connected to the fourth segment (S2), with a feed line (F1, F2) being connected between the first (S5) and fourth (S2) segments. 4. Antenne ifølge krav 2, hvor den første armen er knyttet til den andre armen ved at det sjette segmentet (S4) er koblet til det første segmentet (55) , idet en fødeledning (Fl, F2) er koblet mellom de tredje (Sl) og fjerde (S2) segmentene.4. Antenna according to claim 2, where the first arm is connected to the second arm in that the sixth segment (S4) is connected to the first segment (55), a feed line (F1, F2) being connected between the third (S1 ) and fourth (S2) segments. 5. Antenne ifølge krav 2, hvor vinkelen mellom det første (S5) og det andre (56) segmentet er 90°, vinkelen mellom det tredje (Sl) og fjerde (S2) segmentet er 90°, vinkelen mellom det fjerde (S2) og femte (S3) segmentet er 90°, og vinkelen mellom det femte (S3) og sjette (S4) segmentet er 90°. Og vinkelen mellom det femte (S3) og sjette (S4) segmentet er 90°.5. Antenna according to claim 2, where the angle between the first (S5) and second (56) segments is 90°, the angle between the third (S1) and fourth (S2) segments is 90°, the angle between the fourth (S2) and the fifth (S3) segment is 90°, and the angle between the fifth (S3) and sixth (S4) segments is 90°. And the angle between the fifth (S3) and sixth (S4) segments is 90°. 6. Antenne ifølge krav 5, hvor fødeledningen (Fl, F2) halverer vinkelen mellom de første og sjette segmentene (S5, S4) eller mellom de tredje og fjerde segmentene (Sl, S2).6. Antenna according to claim 5, where the feed line (F1, F2) bisects the angle between the first and sixth segments (S5, S4) or between the third and fourth segments (S1, S2). 7. Antenne ifølge krav 3, hvor antenne er avstemt med en kondensator (7) og/eller en spole.7. Antenna according to claim 3, where the antenna is tuned with a capacitor (7) and/or a coil. 8. Antenne ifølge krav 7, hvor antennen avstemmes ved hjelp av avstemmingskondensatorer (7) som svitsjes inn i kretsen med svitsjer (8) kontrollert av en mikroprosessor (10).8. Antenna according to claim 7, where the antenna is tuned by means of tuning capacitors (7) which are switched into the circuit with switches (8) controlled by a microprocessor (10). 9. Antenne ifølge et av de foregående kravene, hvor antennen er montert parallelt med et transportbånd som transporterer objekter på hvilke det er montert RFID-brikker.9. Antenna according to one of the preceding claims, where the antenna is mounted parallel to a conveyor belt that transports objects on which RFID chips are mounted.
NO20140060A 2014-01-17 2014-01-17 Antenna for RFID chip detection NO20140060A1 (en)

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Application Number Priority Date Filing Date Title
NO20140060A NO20140060A1 (en) 2014-01-17 2014-01-17 Antenna for RFID chip detection
PCT/NO2015/050011 WO2015108426A1 (en) 2014-01-17 2015-01-19 An antenna for detecting rfid tags

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NO20140060A NO20140060A1 (en) 2014-01-17 2014-01-17 Antenna for RFID chip detection

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ES2145909T3 (en) * 1994-04-18 2000-07-16 Alfa Laval Agri Ab ANTENNA ARRANGEMENT.
US5914692A (en) * 1997-01-14 1999-06-22 Checkpoint Systems, Inc. Multiple loop antenna with crossover element having a pair of spaced, parallel conductors for electrically connecting the multiple loops
EP1793326A3 (en) * 2002-01-09 2008-06-11 Vue Technology, Inc. Intelligent station using multiple RF antennae and inventory control system and method incorporating same
JP4226572B2 (en) * 2005-05-11 2009-02-18 株式会社日立国際電気 Reader / writer device

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