×

RFID reader and method for removing a transmission carrier leakage signal

  • US 20070194886A1
  • Filed: 12/06/2006
  • Published: 08/23/2007
  • Est. Priority Date: 02/06/2006
  • Status: Active Grant
First Claim
Patent Images

1. A radio frequency identification (RFID) reader comprising:

  • a transmitting circuit which generates a transmitted signal to operate an RFID tag;

    a receiving circuit which receives a received signal including a tag signal from the RFID tag and a transmission carrier leakage signal leaking from the transmitting circuit; and

    a leakage removing circuit which senses a phase and an amplitude of the transmission carrier leakage signal inputted to the receiving circuit, converts the transmitted signal from the transmitting circuit into a signal having a phase opposite to that of the transmission carrier leakage signal and an amplitude equal to that of the transmission carrier leakage signal, and synthesizes the converted signal and the received signal inputted to the receiving circuit.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×