Method and system for standing wave detection for radio frequency identification marker readers
US8120462B2 · kind B2 · utility
4Cited by
4References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 25, 2006 |
| Grant date | Feb 21, 2012 |
| Priority date | — |
| Expiry date | Aug 3, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10128
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and system for determining the absence and presence of items in an RFID interrogation zone. At least one RFID reader transmits interrogation signals in an interrogation zone. Each RFID reader transmits interrogation signals having a forward amount of RF energy and receives response signals from the items in the interrogation zone having a reflected amount of RF energy. A detection circuit determines the presence and absence of items within the interrogation zone based at least in part on the reflected amount of RF energy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.