Transponder intended for several different applications
US6685096B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2000 |
| Grant date | Feb 3, 2004 |
| Priority date | — |
| Expiry date | Dec 31, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/07345
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Transponder (2) associated with a communication system for various different applications having different security levels. This transponder includes means (18, 26, 40, R) allowing the maximum communication distance between the transponder and a reader (4) to be varied as a function of the application selected or activated. A code, which determines the opening or closing of the switch (40) is associated with each application. In a first group of embodiments, the equivalent impedance of the electronic unit associated with the antenna (6) is varied, whereas in another embodiment, the electric characteristics of the antenna itself are varied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.