Dual-frequency RFID tag with isolated inputs
US9087281B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 2011 |
| Grant date | Jul 21, 2015 |
| Priority date | — |
| Expiry date | Jun 5, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/095
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An Integrated Circuit (IC) for an RFID tag includes two electrically isolated antenna ports for connecting to two antennas, with each antenna port configured to operate at a different frequency range and/or with a different communications protocol. In some embodiments a rectifier coupled to one of the antenna ports is operable to extract energy from an electromagnetic field in a first frequency range, and a demodulator coupled to the other antenna port is operable to demodulate symbols according to an RFID protocol in a second frequency range. In some embodiments the frequency ranges are disjoint, intersecting, or one is a proper subset of the other. In some embodiments each port is coupled to its own rectifier and/or its own modulator and/or its own demodulator. In some embodiments an RFID tag includes the IC and two antennas, each operable in one of the two frequency ranges.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.