Rfid-label with an element for regulating the resonance frequency
US6796508B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 19, 2003 |
| Grant date | Sep 28, 2004 |
| Priority date | — |
| Expiry date | Feb 19, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2431
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An RFID label comprises a resonant circuit consisting of a coil and a capacitor. The RFID label is provided with an additional element (13, 17, 20, 21) for regulating the resonance frequency of the resonant circuit. The additional element is applied to the surface of the RFID label after production of the same. The additional element can be especially a sticker with a conductive layer, which is stuck in such a way that it partially overlaps individual conductive surfaces of the label to produce an additional capacitance, or which is simply stuck into the coil to reduce the effective inductance of the coil. Alternatively, the element can be formed by a layer with a high relative permittivity which is applied between two conductive surfaces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.