Auto-tuned RFID reader antenna
US7439860B2 · kind B2 · utility
24Cited by
9References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 22, 2006 |
| Grant date | Oct 21, 2008 |
| Priority date | — |
| Expiry date | Aug 27, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10316
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A reader for an RFID system includes an antenna assembly, a signal driver and a controller. The antenna assembly has an antenna coupled to an antenna tuning circuit which includes a variable capacitance circuit. The signal driver is coupled to the antenna assembly to apply a drive signal to the antenna assembly. The controller is coupled to the antenna assembly to determine a difference between an antenna impedance and a signal driver impedance and to set the variable capacitance at a set capacitance value which reduces the impedance difference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.