Patent ID: 6644555
Filing Date: 2003-11-11
Classification: G06K,H01Q

Abstract:
A contactless radio frequency smart card, including a sensor coil (1) having at least two coil terminals, an electronic circuit (2) connected to said coil (1) and an antenna (3) made of a material with high magnetic permeability, the antenna (3) including a first part (A) located substantially in the plane of the upper coil surface and a second part (B) located substantially in the plane of the lower coil surface, characterised in that said antenna (3) includes a connecting part (C) between the first part (A) and the second part (B), the connecting part (C) passing substantially through the centre of the coil (1), wherein said coil (1) is dimensioned relative to the antenna (3) such that the voltages induced across said coil terminals are of the same order of magnitude, whether the antenna is parallel or perpendicular to the lines of flux generated by a reader.