Wide band RFID system with tag on flexible label
US7504952B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2005 |
| Grant date | Mar 17, 2009 |
| Priority date | — |
| Expiry date | Jan 23, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/07786
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An active radio frequency identification (REID) tag implemented on a flat label. The tag includes a battery printed on the label, a flat wide-band antenna printed on the label and a wide band communication circuit implemented as a chip inlay inside the label. The circuit is attached to the battery and to the antenna. The combined thickness of the battery, the antenna and the circuit as printed on the flexible label is less than one millimeter. The battery, the antenna and the circuit are printed on the label so as to render substantial flexibility to the RFID tag. The circuit operates at a center frequency of at least one gigahertz and a bandwidth at least twenty percent of said center frequency or a bandwidth at least 500 Mhz. The tag typically includes an inaccurate clock source such as an RC circuit and does not include a crystal. Average power consumption of the battery is preferably reduced by operating the tag with a low duty ratio between an active and an inactive interval; and during the active interval transmitting in bursts while turning off parts of the tag between the bursts. The communications circuit performs timing measurements on incoming received waveforms and tran…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.