Reader for a high information capacity SAW identification tag and method of use thereof
First Claim
1. A surface acoustic wave (SAW) identification tag reader, comprising:
- a transmitter capable of sending an interrogation signal that excites a SAW transducer located on a piezoelectric substrate, said piezoelectric substrate having a group of slots arranged by both pulse position and phase position, and a number of reflectors distributed among said slots such that said reflectors return to said transducer a return signal containing a number encoded by both pulse position and phase position; and
a receiver for detecting said return signal and decoding said number.
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Accused Products
Abstract
The present invention provides for a surface acoustic wave (SAW) identification tag reader and for methods of operating and manufacturing the same. In one embodiment, the SAW identification tag reader includes: (1) a transmitter capable of sending an interrogation signal that excites a SAW transducer located on a piezoelectric substrate, the piezoelectric substrate having a group of slots arranged by both pulse position and phase position, and a number of reflectors distributed among the slots such that the reflectors return to the transducer a return signal containing a number encoded by both pulse position and phase position; and (2) a receiver for detecting the return signal and decoding the number.
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Citations
34 Claims
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1. A surface acoustic wave (SAW) identification tag reader, comprising:
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a transmitter capable of sending an interrogation signal that excites a SAW transducer located on a piezoelectric substrate, said piezoelectric substrate having a group of slots arranged by both pulse position and phase position, and a number of reflectors distributed among said slots such that said reflectors return to said transducer a return signal containing a number encoded by both pulse position and phase position; and
a receiver for detecting said return signal and decoding said number. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of operating a surface acoustic wave (SAW) identification tag reader, comprising:
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transmitting an interrogation signal to excite a SAW transducer located on a piezoelectric substrate to create a SAW, said piezoelectric substrate having a group of slots arranged by both pulse position and phase position;
causing said SAW to reflect from a number of reflectors located on said piezoelectric substrate, said number of reflectors distributed among said slots such that said reflector return to said transducer a return signal containing a number encoded by both pulse position and phase position;
detecting said return signal with a receiver; and
decoding said number. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of manufacturing a surface acoustic wave (SAW) identification tag reader, comprising:
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providing a transmitter capable of sending an interrogation signal that excites a SAW transducer located on a piezoelectric substrate to create a SAW, said piezoelectric substrate having a group of slots arranged by both pulse position and phase position, and a number of reflectors distributed among said slots such that said reflectors return to said transducer a return signal containing a number encoded by both pulse position and phase position; and
providing a receiver for detecting said return signal and decoding said number. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification