Transponder demodulator for a low antenna limiter threshold
US8207831B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 27, 2008 |
| Grant date | Jun 26, 2012 |
| Priority date | — |
| Expiry date | Oct 25, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0723
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An RFID transponder having an antenna for receiving an RF signal including an amplitude modulated downlink data signal, and a demodulating stage coupled to the antenna for receiving a derived RF signal which is derived from the received RF signal. The demodulating stage has a first filter for extracting a field strength signal component from the derived RF signal and a second filter for extracting the modulated downlink data signal component from the derived RF signal. Further, a demodulator is coupled to the second filter to receive the modulated downlink signal for demodulating the modulated downlink data signal component and coupled to the first filter to receive the field strength signal such that the demodulator is adapted to vary a demodulation sensitivity parameter in response to the field strength signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.