Patent ID: 6774865
Filing Date: 2004-08-10
Classification: G06K

Abstract:
A device (40, 50) comprising a combination of at least two contactless integrated circuits (1, 45, 61), each integrated circuit being connected to an individual antenna coil (46, Ls) to send and/or receive data by inductive coupling, characterised in that it comprises a collective antenna coil (42, 60, Lc) that is larger in size than the individual antenna coils of the integrated circuits, and means (41, 51, 53) for arranging the individual coil of an integrated circuit proximate to the collective coil, at least when data are to be read and/or written in the integrated circuit, so that the individual coil of the integrated circuit is inductively coupled to the collective coil, the integrated circuits (1, 45, 61) being arranged or programmed to implement an anti-collision protocol which enables a data send and/or receive station to select one, and only one, integrated circuit during communication with the device.