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RFID-tag communication device

  • US 20060267734A1
  • Filed: 07/31/2006
  • Published: 11/30/2006
  • Est. Priority Date: 02/04/2004
  • Status: Active Grant
First Claim
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1. An RFID-tag communication device including an antenna from which a transmission signal is transmitted toward an RFID tag and through which a reply signal transmitted from the RFID tag in response to the transmission signal is received, for radio communication with the RFID tag, said RFID-tag communication device comprising:

  • a first-cancel-signal output portion operable to generate a digital first cancel signal for suppressing a leakagel signal from a received signal which is received through said antenna and which contains said leakage signal as well as said rely signal, said leakage signal being a part of said transmission signal which is transmitted from said antenna and which is returned to and received by said antenna;

    a first-cancel-signal control portion operable to control an amplitude and/or a phase of said first cancel signal generated by said first-cancel-signal output portion;

    a first-cancel-signal D/A converting portion operable to convert said first cancel signal generated by said first-cancel-signal output portion, into an analog signal; and

    a first signal combining portion operable to combine together the analog first cancel signal generated by said first-cancel-signal D/A converting portion, and said received signal, to obtain a first composite signal.

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