CA2492062A1 - Pulsed power method for increased read range for a radio frequency identification reader - Google Patents

Pulsed power method for increased read range for a radio frequency identification reader

Info

Publication number
CA2492062A1
CA2492062A1 CA 2492062 CA2492062A CA2492062A1 CA 2492062 A1 CA2492062 A1 CA 2492062A1 CA 2492062 CA2492062 CA 2492062 CA 2492062 A CA2492062 A CA 2492062A CA 2492062 A1 CA2492062 A1 CA 2492062A1
Authority
CA
Grant status
Application
Patent type
Prior art keywords
radio frequency
frequency identification
interrogation signal
pulsed
transmitting
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.)
Granted
Application number
CA 2492062
Other languages
French (fr)
Other versions
CA2492062C (en )
Inventor
Hubert A. Patterson
Philip A. Lazo
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.)
Sensormatic Electronics Corp
Original Assignee
Sensormatic Electronics Corporation
Hubert A. Patterson
Philip A. Lazo
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

Links

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009Methods 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
    • G06K7/10198Methods 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 setting parameters for the interrogator, e.g. programming parameters and operating modes
    • G06K7/10217Methods 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 setting parameters for the interrogator, e.g. programming parameters and operating modes parameter settings controlling the transmission power of the interrogator
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/0008General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009Methods 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
    • G06K7/10019Methods 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 resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.

Abstract

A method to power a radio frequency identification (RFID) reader to increase multi~tag reading capability and increase the reading range of a passive tag without maximizing the continuous transmitted power level is provided. The RFID reader transmits a pulsed interrogation signal until an RFID tag response is received, and then switches to a continuous and pulsed power scheme. The continuous power emitted maintains the power supplied to the RFID tags so the tags will not reset due to loss of power. The pulsed signal permits reading the tags at longer ranges, especially when there is a plurality of tags in the area.

Claims (7)

1. A method for transmitting a radio frequency identification interrogation signal for increasing a radio frequency identification tag reading range, comprising:
transmitting a pulsed radio frequency identification interrogation signal;
receiving a response signal from a radio frequency identification tag;
after receiving said response signal, transmitting said pulsed radio frequency identification interrogation signal and a continuous radio frequency identification interrogation signal simultaneously; and, after not receiving a response signal from another radio frequency identification tag, transmitting only said pulsed radio frequency identification interrogation signal.
2. The method of claim 1 further comprising, after receiving said response signal, reading data associated with said radio frequency identification tag; and, turning said radio frequency identification tag off wherein said radio frequency identification tag does not emit a response signal.
3. The method of claim 2 further comprising, prior to transmitting only said pulsed radio frequency identification interrogation signal after not receiving a response signal from another radio frequency identification tag, turning all radio frequency identification tags on.
4. The method of claim 2 further comprising, prior to transmitting only said pulsed radio frequency identification interrogation signal after not receiving a response signal from another radio frequency identification tag, turning a preselected radio frequency identification tag on.
5. The method of claim 1 wherein transmitting the pulsed radio frequency identification interrogation signal comprises transmitting a pulsed radio frequency identification interrogation signal at a level of up to about 4-watts at a 15% duty cycle measured over about 200 msec.
6 6. The method of claim 5 wherein transmitting the pulsed radio frequency identification interrogation signal and the continuous radio frequency identification interrogation signal comprises transmitting said pulsed radio frequency identification interrogation signal and a continuous radio frequency identification interrogation signal at a level of up to about 500 mwatts.
7
CA 2492062 2002-08-09 2003-08-11 Pulsed power method for increased read range for a radio frequency identification reader Active CA2492062C (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US10216576 US6707376B1 (en) 2002-08-09 2002-08-09 Pulsed power method for increased read range for a radio frequency identification reader
US10/216,576 2002-08-09
PCT/US2003/025112 WO2004015613A3 (en) 2002-08-09 2003-08-11 Pulsed power method for increased read range for a radio frequency identification reader

Publications (2)

Publication Number Publication Date
CA2492062A1 true true CA2492062A1 (en) 2004-02-19
CA2492062C CA2492062C (en) 2010-04-06

Family

ID=31714293

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2492062 Active CA2492062C (en) 2002-08-09 2003-08-11 Pulsed power method for increased read range for a radio frequency identification reader

Country Status (7)

Country Link
US (1) US6707376B1 (en)
EP (1) EP1527616B1 (en)
JP (1) JP4563175B2 (en)
CN (1) CN100527858C (en)
CA (1) CA2492062C (en)
ES (1) ES2380660T3 (en)
WO (1) WO2004015613A3 (en)

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Also Published As

Publication number Publication date Type
US20040036575A1 (en) 2004-02-26 application
WO2004015613A3 (en) 2004-07-08 application
CA2492062C (en) 2010-04-06 grant
ES2380660T3 (en) 2012-05-17 grant
CN100527858C (en) 2009-08-12 grant
EP1527616A2 (en) 2005-05-04 application
JP4563175B2 (en) 2010-10-13 grant
EP1527616B1 (en) 2012-02-29 grant
EP1527616A4 (en) 2009-05-13 application
US6707376B1 (en) 2004-03-16 grant
CN1669340A (en) 2005-09-14 application
WO2004015613A2 (en) 2004-02-19 application
JP2005535968A (en) 2005-11-24 application

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