RFID tags
US7205898B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Sep 30, 2005 |
| Grant date | Apr 17, 2007 |
| Priority date | — |
| Expiry date | Nov 30, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/07771
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method for the use of ultra high frequency RFID tags in conjunction with metal substrates, as well as substrates used to contain liquid. Briefly, an RFID isolator comprised of a material with complex magnetic permeability, used either by itself, or in combination with dielectric isolator material, is interposed between the RFID tag and the substrate. Alternatively, a material possessing at least two distinct dielectric constants is interposed between the RFID tag and the substrate, such that there is a high dielectric constant at the interface with the substrate, and a low dielectric constant at the interface with the RFID tag. This material can be a single material having a dielectric constant gradient, or alternatively, two or more separate layers, each with a uniform but different dielectric constant, sandwiched together.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.