Method for selecting and writing into RFID-transponders
US6639514B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 25, 2002 |
| Grant date | Oct 28, 2003 |
| Priority date | — |
| Expiry date | Feb 25, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10019
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Method and system for reading out and writing to RFID-transponders with inductive coupling including a read/write unit with a transmission frequency fs1 defined as a basic transmission frequency and a plurality of transponders operated at a resonance frequency fR. The resonance frequency fR is fixedly predetermined, then for operating conditions with a high distance range, the resonance frequency fR equal to the basic transmission frequency fs1 is selected. For operating conditions with a high recognition rate with a plurality of transponders located within a detection field, the basic transmission frequency fs1 is reduced to a fixed alternative value fs2 . This procedure guarantees reliable communication between the transponders and the read/write unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.