Radio-frequency identification (RFID) tag employing unique reception window and method therefor
US7295115B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 16, 2005 |
| Grant date | Nov 13, 2007 |
| Priority date | — |
| Expiry date | Oct 9, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/765
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A radio-frequency identification (RFID) tag employing a unique reception window and method for operating the tag system provides low-power operation for enhanced tag battery life, while providing addressable tags that can receive commands and data from the system, which can be a wireless local area network (WLAN) incorporating location finding for locating the tags. Interference with other tags and other transmitters is prevented by either using a sniffer circuit to determine that no network transmission is in progress, or by using a special non-interfering coding sequence. A receiver within the tag is operated for a predetermined period of time after a periodic transmission is made from the tag, and an address decoder determines if the tag is being addressed. The receiver can receive data and/or commands after being addressed and is shutdown if the window time elapses, the tag is not addressed, or at the completion of data/command transfer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.