Radio-frequency identification system
US9294157B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Aug 20, 2007 |
| Grant date | Mar 22, 2016 |
| Priority date | — |
| Expiry date | Jan 20, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/263
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The invention is a radio-frequency identification system consisting of a reader and a tag. The reader comprises a transmit/receive resonant circuit comprising one or more coils, a means for repeatedly driving the transmit/receive resonant circuit with pulses of a periodic signal, a means for obtaining a tag response signal from the transmit/receive resonant circuit, a means for extracting tag information from the tag response signal obtained from the transmit/receive resonant circuit, a receive resonant circuit comprising one or more coils, a means for obtaining a tag response signal from the receive resonant circuit, and a means for extracting tag information from the tag response signal obtained from the receive resonant circuit. The tag comprises a plurality of resonant circuits, a means for recognizing he presence of an interrogating magnetic field, and a means for embedding information to be communicated to the interrogating reader in at least one coil current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.