Reader for a high information capacity SAW identification tag and method of use thereof
US6708881B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 2002 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Aug 27, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0672
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.