Surface acoustic wave identification tag having an interdigital transducer adapted for code discrimination and methods of operation and manufacture thereof
First Claim
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1. A surface acoustic wave (SAW) identification tag having a coded transducer, comprising:
- a piezoelectric substrate having a number of reflectors distributed among a group of slots arranged by both pulse position and phase position on said substrate for encoding a number by pulse and phase position; and
a SAW transducer located on said substrate for generating a coded interrogation pulse.
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Abstract
A surface acoustic wave (SAW) identification tag having a coded transducer and methods of operating and manufacturing the tag. In one embodiment the tag includes: (1) a piezoelectric substrate having a number of reflectors distributed among a group of slots arranged by both pulse position and phase position on the substrate for encoding a number by pulse and phase position; and (2) a SAW transducer located on the substrate for generating a coded interrogation pulse.
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Citations
20 Claims
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1. A surface acoustic wave (SAW) identification tag having a coded transducer, comprising:
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a piezoelectric substrate having a number of reflectors distributed among a group of slots arranged by both pulse position and phase position on said substrate for encoding a number by pulse and phase position; and
a SAW transducer located on said substrate for generating a coded interrogation pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a surface acoustic wave (SAW) identification tag having a coded transducer, comprising:
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exciting a SAW transducer located on a piezoelectric substrate to produce a coded interrogation pulse, said coded interrogation pulse reflecting from reflectors distributed by both pulse position and phase position among a group of slots arranged on said substrate; and
selecting and demodulating a reflected pulse from said coded interrogation pulse to yield a number encoded by both pulse position and phase position. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of manufacturing a surface acoustic wave (SAW) identification tag having a coded transducer, comprising:
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depositing a number of reflectors on a piezoelectric substrate such that said reflectors are distributed among a group of slots arranged by both pulse position and phase position for encoding a number by pulse and phase position; and
forming a SAW transducer located on said substrate for generating a coded interrogation pulse. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification