Spatially selective UHF near field microstrip coupler device and RFID systems using device
US9852318B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2012 |
| Grant date | Dec 26, 2017 |
| Priority date | — |
| Expiry date | Aug 6, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K17/0025
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system having a UHF RFID transceiver is adapted to communicate exclusively with a single electro-magnetically coupled transponder located in a predetermined confined transponder operating region. The system includes a near field coupling device comprising a plurality of lines connected in parallel with an unmatched load. The near field coupling device may be formed, for example on a printed circuit board with a plurality of electrically interconnected traces and a ground plane. The system establishes, at predetermined transceiver power levels, a mutual electro-magnetic coupling which is selective exclusively for a single transponder located in a defined transponder operating region. Also included are methods for selective communication with the transponder in an apparatus such as a printer-encoder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.