METHOD AND APPARATUS FOR IMPROVING THE EFFICIENCY AND ACCURACY OF RFID SYSTEMS
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Abstract
The present invention relates to a method and apparatus for transmitting a narrow signal beam that allows the precise location of RFID tags to be determined and reduces tag collisions. The present invention further relates to a method and apparatus for combing an RFID reader with an optical source to visualize the interrogation zone of the reader. The present invention also relates to a method and apparatus for improving the efficiency of RFID systems.
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Citations
46 Claims
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27. A method for improving the efficiency of RFID systems having RFID readers and RFID tags, comprising the steps of:
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employing an antenna array by an RFID reader, broadcasting a data signal using said antenna array, broadcasting a scramble signal using said antenna array, and adjusting array excitation coefficients of said antenna array for said data signal and said scramble signal such that said scramble signal overshadows said data signal in all but selected regions. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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Specification