Passive dynamic antenna tuning circuit for a radio frequency identification reader
US7528725B2 · kind B2 · utility
38Cited by
8References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 29, 2006 |
| Grant date | May 5, 2009 |
| Priority date | — |
| Expiry date | Oct 31, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10336
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A resonant antenna circuit for a radio frequency identification (RFID) reader generates an electrical signal for activating a passive identification tag. The identification tag in turn generates a coded electrical signal that is detected by the reader. The electrical characteristics of the resonant circuit are dynamically altered so that the antenna performs more optimally as a transmitter and receiver for different types of transponders. The resonant circuit uses only passive components and the instantaneous resonant frequency tuning point is determined by the state of the activation signal transmitter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.