Electromagnetic transponder operating in very close coupling
US6547149B1 · kind B1 · utility
21Cited by
36References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2000 |
| Grant date | Apr 15, 2003 |
| Priority date | — |
| Expiry date | Apr 5, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0723
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An electromagnetic transponder of the type including an oscillating circuit upstream of a rectifier adapted to providing a D.C. supply voltage to an electronic circuit, the electronic circuit including circuitry for transmitting digitally coded information, and the transponder including circuitry for detuning the oscillating circuit with respect to a determined frequency, the circuitry for detuning the oscillating circuit being used when the transponder has to transmit information while it is very close to a read/write terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.