Battery assisted tag and RFID system
US8581704B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2009 |
| Grant date | Nov 12, 2013 |
| Priority date | — |
| Expiry date | Jun 14, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/13095
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Embodiments of the present invention provide for RFID systems that employ a plurality of battery assisted semi-passive and semi-active RFID tags with optimized system operation. The RFID tags feature receivers operating with multiple dynamic range states with square law mode for improved sensitivity, and part time active transmit in the tag to supplement its backscatter transmitter and thus support system operation taking full advantage of the sensitivity of the tag. In certain embodiments of the invention, tag sensitivity and reliability are further enhanced by the use pseudo-random sequence based receiver training and frame synchronizing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.