NFC card for handheld device
AssigneeInside Secure
InventorNicolas Cordier
Life of this patent
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Abstract
An NFC card includes an antenna circuit including an antenna coil having at least one magnetic axis, and at least one integrated circuit linked to the antenna circuit. The magnetic axis of the antenna coil is substantially parallel to at least one side of the card, and the card further includes at least one electrically conductive screen extending near the antenna coil, which does not cross the magnetic axis. The card does not include any magnetically permeable material between the at least one conductive screen and the antenna coil. Embodiments of the invention are applicable in particular to SIM-NFC card and SD-NFC cards.
Claims15
An NFC card comprising:
- an antenna circuit comprising an antenna coil having at least one magnetic axis,
- at least one integrated circuit linked to the antenna circuit, and
- at least one electrically conductive screen extending near the antenna coil, which does not cross the magnetic axis
- wherein the magnetic axis of the antenna coil is substantially parallel to at least one side of the card, and the card does not include any magnetically permeable material between the at least one conductive screen and the antenna coil.
A method for performing a contactless communication between an NFC card and an NFC external device (ED), the method comprising:
- providing an NFC card comprising:
- an antenna circuit comprising an antenna coil having at least one magnetic axis,
- at least one integrated circuit linked to the antenna circuit, and
- at least one electrically conductive screen extending near the antenna coil, which does not cross the magnetic axis,
- wherein the magnetic axis of the antenna coil is substantially parallel to at least one side of the card, and the card does not include any magnetically permeable material between the at least one conductive screen and the antenna coil,
- setting a tuning frequency of the antenna circuit of the card in the presence of the at least one electrically conductive screen,
- emitting a first oscillating magnetic field with the external device,
- placing the card near the edges of a printed circuit board, and
- using the conductive screen to protect the tuning frequency of the antenna circuit against the detuning effect of the printed circuit board, to increase the maximum communication distance between the card and the external device.
Dependencies are inferred from the claim text.