Three dimensional RF signatures
US8330601B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 2006 |
| Grant date | Dec 11, 2012 |
| Priority date | — |
| Expiry date | Jun 24, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/07767
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Three dimensional RF tag signatures may be obtained from a three dimensional RF tag or multiple two or three dimensional RF tags so that information in addition to presence information may be obtained. In one embodiment, a three dimensional RF tag having two or more power coils disposed in non-coplanar planes enables the coils to experience different levels of excitation from an electromagnetic field. This information may be transmitted along with the RF tag response to enable the orientation of the RF tag relative to an RF tag reader to be determined. In another embodiment, multiple RF tags (either standard RF tags or three dimensional RF tags) may be used on a given article and a response signature from the article as a whole may be recorded. The three dimensional response signature thus collected may be compared with previous versions of the response signature to determine if the article has been altered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.