Electronic entity with magnetic antenna

Abstract

The invention concerns an electronic entity comprising an electronic circuit and an antenna one part of which at least forms a conductive circuit connected to two ends of the electronic circuit. The projection of the circuit formed by the antenna and the electronic circuit in a plane which is substantially parallel thereto, forms an intersection-free line and the antenna includes a winding which extends over strictly more than one turn.

Description

technical field [0001] The invention relates to electronic entities with magnetic antennas. Background technique [0002] Such an electronic entity generally comprises an electronic circuit having in particular two terminals to which are connected a magnetic antenna, usually formed by winding several turns of conductive material. [0003] Such electronic entities cover in particular contactless microcircuit cards (where a magnetic antenna constitutes the only means of communication between the microcircuit and the outside world) and so-called "dual" or "hybrid" microcircuit cards (here one surface of the card is provided with a realization Another mode of electrical contact for a microcircuit to communicate with the outside world). In whatever microcircuit card, the turns of the magnetic antenna typically appear as coils of copper wire or conductive tracks, in both cases arranged within those layers that physically constitute the card. [0004] In all cases, in order to in...

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Problems solved by technology

[0005] However, increasing the number of turns quickly leads to some problems: on the one hand, increasing the area carrying these turns relative to the available area can cause crowding problems, especially when the turn geometry is relatively fixed, which is the case when electronic entities have This is especially troublesome in the case of small form factors; on the other hand, the few areas that can usually be used to accommodate these turns (for example, often deposited in the same plane) must use bridging techniques to loop the circuit, as in as disclosed in patent application FR 2 769 390

[0006] Some techniques have been proposed to simplify the design or fabrication of the bridge, for example by combining looping and connection with the electronic circuit, but again the need to loop the magnetic antenna is still required, and this instead makes the proposed electronic entity design more structured. is complex or too thick

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