METHOD AND APPARATUS FOR IMPROVING THE EFFICIENCY AND ACCURACY OF RFID SYSTEMS
First Claim
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1. A method for interrogating RFID tags comprising:
- transmitting a data signal that causes said RFID tags to respond, transmitting one or more scramble signals that do not cause said RFID tags to respond, and adjusting said data signal and said one or more scramble signals such that said one or more scramble signals overshadow said data signal in all but selected regions.
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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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1. A method for interrogating RFID tags comprising:
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transmitting a data signal that causes said RFID tags to respond, transmitting one or more scramble signals that do not cause said RFID tags to respond, and adjusting said data signal and said one or more scramble signals such that said one or more scramble signals overshadow said data signal in all but selected regions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method for optically displaying the interrogation zone of an RFID reader, comprising the steps of:
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attaching an optical source to an RFID reader, and, transmitting one or more light beams with said optical source to visualize said interrogation zone. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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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, and, broadcasting a scramble signal using said antenna array. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A method for interrogating RFID tags comprising the steps of:
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providing a tag antenna to interrogate said RFID tags, and, placing said RFID tags at locations where said tag antenna creates maximum disruption of a field distribution. - View Dependent Claims (42, 43, 44, 45, 46)
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Specification