High sensitivity reader for passive transponders
US7014111B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 2001 |
| Grant date | Mar 21, 2006 |
| Priority date | — |
| Expiry date | Dec 27, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0723
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The invention concerns a reader (10) for identifying passive transponders (12) comprising an antenna for receiving a first signal (Tx) from the reader and for transmitting a second signal (Rx). The reader comprises: a time base (54) generating a sinusoidal signal, a control circuit (64), a modulator (56) for transmitting to the control circuit (64) data to modulate the sinusoidal signal so as to generate a signal carrying commands which, when it is received by the antenna of said transponder, forms said first signal (Tx), a demodulator (58), a decoder (60), a communication interface (62) and an antenna (14). The demodulator (60), which is connected to the antenna (14) to receive the second signal (Rx), comprises two multipliers (76, 78), one (78) being of the inverter type, and an adder (70) designed to combine the data derived from the multipliers (76, 78).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.