Impedance matching network and multidimensional electromagnetic field coil for a transponder interrogator
US7145451B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 1, 2004 |
| Grant date | Dec 5, 2006 |
| Priority date | — |
| Expiry date | Nov 12, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/0008
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An improved interrogator for an inductively coupled identification system is disclosed. The interrogator provides a multidimensional electromagnetic field through a plurality of coils aligned relative to each other. The coils provide a rotating magnetic field having approximately constant amplitude regardless of orientation with respect to the transponder. An additional coil may be utilized to precess the multidimensional electromagnetic field. The interrogator may further provide an impedance matching network that includes a series drive capacitor to match the impedance of a capacitor in parallel with a coil to a driver load impedance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.