Electromagnetic transponder read terminal operating in very close coupling
US6650229B1 · kind B1 · utility
33Cited by
73References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2000 |
| Grant date | Nov 18, 2003 |
| Priority date | — |
| Expiry date | Apr 5, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/0008
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A terminal for generating an electromagnetic field adapted to cooperating with at least one transponder when the latter enters its field, the terminal including an oscillating circuit adapted to receiving a high frequency A.C. excitation voltage, and circuitry for detuning this oscillating circuit with respect to a determined transmission frequency when a transponder is very close to the terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.