Anti-collision interrogation pulse focusing system for use with multiple surface acoustic wave identification tags and method of operation thereof
First Claim
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1. A system for avoiding code collisions from multiple SAW identification tags, comprising:
- a directing means for directing an interrogation pulse having a circular polarity toward said tags, said interrogation pulse generating a corresponding SAW in each of said tags that travels a preselected direction; and
a receiving means for recieving coded responses from only ones of said tags responding to said interrogation pulse.
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Abstract
The present invention provides a system for avoiding code collisions from multiple SAW identification tags and a method of operating such system. In one embodiment the invention provides for (1) focusing an interrogation pulse to within a defined space; and (2) discriminating between coded responses returned from tags located within such defined space.
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Citations
13 Claims
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1. A system for avoiding code collisions from multiple SAW identification tags, comprising:
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a directing means for directing an interrogation pulse having a circular polarity toward said tags, said interrogation pulse generating a corresponding SAW in each of said tags that travels a preselected direction; and a receiving means for recieving coded responses from only ones of said tags responding to said interrogation pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. The system for avoiding code collisions from multiple SAW identification tags, comprising:
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a directing means for directing an interrogation pulse having a circular polarity toward said tags, said interrogation pulse generating a corresponding SAW in each of said tags that travels a preselected directionwherein said tags can be turned off; and a receiving means for recieving coded responses from only ones of said tags responding to said interrogation pulse. - View Dependent Claims (12, 13)
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Specification