Coil antenna and non-contact information medium

H - Electricity – 01 – Q

Patent

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Details

H01Q 7/00 (2006.01) G06K 19/07 (2006.01) G06K 19/077 (2006.01)

Patent

CA 2702284

An object is to provide a coil antenna that is adaptable to a thin figure, and that appropriately makes the ratio of self-inductance to mutual inductance further large, so as to achieve a comparatively small mutual inductance that results in small mutual interaction even when overlapped. Without using a component such as a chip coil, a winding pattern (14) is formed with a wire (16) with which a main wiring pattern (12) is formed. This enables to deal with the flexibility by realizing a thin product using a coil antenna (10). Further, the wiring pattern is designed such that the winding pattern (14) is provided and distributed to the main wiring pattern (12) forming a loop, and is formed with the wire (16) so as to have a wound shape small enough compared with the main wiring pattern (12). In this way, the ratio of the self-inductance to the mutual inductance is appropriately made further large, so that the mutual inductance is made comparatively small.

L'invention concerne une antenne à cadre qui peut être utilisée en faible épaisseur et qui peut être réglée afin d'augmenter le rapport de l'inductance propre à l'inductance mutuelle de façon à réduire les influences réciproques même lorsque l'inductance mutuelle est relativement faible et superposée. Des motifs d'enroulement (14) sont formés à l'aide d'un conducteur (16) formant motif de câblage principal (12) sans nécessiter l'utilisation d'une pièce telle qu'une bobine de circuit intégré. De ce fait, un produit utilisant l'antenne à cadre (10) peut être fin et flexible. En outre, la forme de boucle est répartie dans le motif de câblage principal (12) de telle sorte que les motifs d'enroulement (14) sont formés par le conducteur (16) avec une forme d'enroulement suffisamment petite par rapport au motif de câblage principal (12). Il est ainsi possible de régler efficacement le rapport de l'inductance propre à l'inductance mutuelle de façon à l'augmenter et à avoir une inductance mutuelle relativement réduite.

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