US 6,982,645 B2 | ||
Device for detecting the presence of a transponder around the device | ||
Claudio Ricci, Corso Italia, 52, 20025 Legnano (Italy) | ||
Assigned to Claudio Ricci, Legnano (Italy); and Overton Consultadoria E Serviços LDA, Funchal Madeira (Portugal) | ||
Filed on Jul. 28, 2003, as Appl. No. 10/627,635. | ||
Claims priority of application No. MI2002A1685 (IT), filed on Jul. 29, 2002. | ||
Prior Publication US 2004/0113755 A1, Jun. 17, 2004 | ||
Int. Cl. G08B 13/14 (2006.01) |
U.S. Cl. 340—572.1 | 22 Claims |
7. A device for detecting the presence of a transponder in its proximity, comprising:
an antenna;
pulse generation means;
means adapted to feed said antenna with said pulses;
means for measuring the damped oscillations of said antenna as a consequence of being fed with said pulses;
said means for measuring the damped oscillations of said antenna being suitable to determine whether a transponder is present
or not in the proximity of said antenna by counting the number of said damped oscillations whose amplitude exceeds a preset
threshold, said number being lower if said transponder is in the vicinity of said antenna with respect to when said transponder
is not present.
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