Antenna system for radio frequency identification

专利名称：Antenna system for radio frequency

identification

发明人：JAMES L. RODGERS,BILLY C. FOWLER,PAUL A.

PICARD,HOWARD K. JAECKS,MOHAMMADA. REHMAN,JOHN J. COULTHARD,ROC ALASTINGER

申请号：AU1750300申请日：19991202公开号：AU1750300A公开日：20000807

摘要：An object identification system (100) includes a monitor (124) and a plurality oftransceivers (114) that communicate over a common medium. The monitor includes a firsttransmitter (2424), a first receiver (2416), and a processor (2402). Each transceiverincludes a resonant circuit (204), a transmitter (210), a receiver (208), and an antenna (202)coupled to the resonant circuit. The processor performs a method for performingtransceiver communication (500) that includes the steps of: (a) transmitting (604) fromthe first transmitter a first frequency (170) for a first duration; (b) after lapse of the firstduration, receiving (608) via the first receiver a response signal (172) from at least one ofthe resonant circuits; (c) determining (510) a second frequency from the receivedresponse signal; and (d) performing (512) transceiver communication using the secondfrequency. Transceivers of the type having a resonant circuit coupled to an antenna, whenoperating in close proximity to each other, may interfere with the response from a singletransceiver by absorbing the energy intended to be received by the transceiver,

absorbing the energy transmitted by the transceiver, or altering the resonant frequencyof the resonant circuit. By determining the second frequency for transceiver

communication, the monitor may establish communication with the single transceiver at afrequency better suited for transferring operative power (1593, 1597) to the transceiver,conducting an interrogation protocol (912, 1140, 1130) for identifying the transceiver, orfor data transfer (914, 916, 918, 920).

申请人：DOING BUSINESS AS E-CODE ADDISON TECHNOLOGIES

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