Reader and response control system for discrimination between multiple surface acoustic wave identification tags and method of operation thereof
First Claim
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1. A surface acoustic wave (SAW) identification tag for hierarchical discrimination, comprising:
- a piezoelectric substrate having located thereon a SAW transducer; and
a group of reflectors arranged on said piezoelectric substrate by time position relative to said transducer to encode a number identifying the hierarchical order of an object by said time position.
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Abstract
The present invention provides a system for discriminating between coded responses from multiple SAW identification tags and a method of operating such system. In one embodiment the system provides for (1) a SAW tag reader subsystem that detects coded responses from the tags to an interrogation pulse; and (2) a coded response analyzing subsystem, coupled to the SAW tag reader subsystem, that employs signal processing techniques to separate portions of the coded responses and generates possibilities for remaining portions of the coded responses.
66 Citations
20 Claims
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1. A surface acoustic wave (SAW) identification tag for hierarchical discrimination, comprising:
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a piezoelectric substrate having located thereon a SAW transducer; and
a group of reflectors arranged on said piezoelectric substrate by time position relative to said transducer to encode a number identifying the hierarchical order of an object by said time position. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method to discriminate hierarchically between coded responses from multiple SAW identification tags, comprising:
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generating an interrogation pulse from a SAW transducer located on a piezoelectric substrate; and
receiving a reflected pulse from a group of reflectors arranged on said piezoelectric substrate by time position relative to said transducer to encode a number identifying the hierarchical order of an object by said time position. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of operating a system for hierarchical discrimination, comprising:
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locating a SAW identification tag on an object, said SAW identification tag having a piezoelectric substrate with a SAW transducer thereon; and
arranging a group of reflectors on said piezoelectric substrate by time position relative to said transducer to encode a number identifying the hierarchical order of said object by said time position. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification