Tuning an RFID reader with electronic switches
US7539465B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 16, 2006 |
| Grant date | May 26, 2009 |
| Priority date | — |
| Expiry date | Jul 2, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0723
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A reader for an RFID system includes a signal driver for generating an excitation signal and a resonant circuit having an adjustable resonant circuit capacitance for retuning the resonant circuit in response to detuning. The resonant circuit has a capacitance tuning circuit which includes a fine-tuning capacitor having a fine-tuning capacitance and a fine-tuning capacitor switch having an open position and a closed position. The fine-tuning capacitance is added to the adjustable resonant circuit capacitance when the fine-tuning capacitor switch is in the closed position and is removed from the adjustable resonant circuit capacitance when the fine-tuning capacitor switch is in the open position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.