Self tuning RFID tags
US8952792B1 · kind B1 · utility
29Cited by
3References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 6, 2012 |
| Grant date | Feb 10, 2015 |
| Priority date | — |
| Expiry date | Dec 15, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/13095
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A tuning circuit in an RFID tag may be used to match antenna and integrated circuit (IC) impedances to maximize the efficiency of IC power extraction from an incident RF wave. The tuning circuit, which requires less power to operate than the IC, adjusts a variable impedance to improve the impedance matching between the IC and the tag antenna and thereby increase the IC power extraction efficiency. The IC may begin operating according to a protocol when it extracts sufficient power from the RF wave or when an optimal impedance matching and power transfer is achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.