Method and apparatus for determining the direction of movement of RFID tags and for creating constant-width interrogation zones
US7605684B2 · kind B2 · utility
1Cited by
5References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 5, 2006 |
| Grant date | Oct 20, 2009 |
| Priority date | — |
| Expiry date | Apr 15, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/758
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The disclosed inventions relate to a method and apparatus for creating one-sided interrogation zones. The disclosed inventions further relate to a method and apparatus for determining the direction of movement of tagged items that pass by an RFID reader. The disclosed inventions also relate to a method and apparatus for combining one-sided interrogation zones of two or more antenna arrays to create an interrogation zone that maintains its width over a large range of distances.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.