Chip card with radiofrequency antennas
AssigneeIdemia France
InventorAhmed ALI
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Abstract
A chip card comprising a card body including a metal layer, an RF chip, and a first RF antenna placed in a cut-out zone and connected to the chip. The metal layer has two regions, the first region completely containing the cut-out zone. A first slit connects the cut-out zone to an edge of the first region, a second slit opens onto an edge of the layer or into the cut-out zone and ends in the second region. Two other RF antennas allow coupling to the first antenna. They respectively comprise at least one turn facing the first slit and at least one turn facing the second slit.
Claims20
A chip card comprising:
- a rectangular card body formed at least in part by a metal layer comprising a cut-out zone;
- an RF chip;
- a first RF antenna that is placed in or facing the cut-out zone and electrically connected to the RF chip, said metal layer consisting of a first region and a second region that are delineated by a straight line parallel to a short side of the card, the first region containing the cut-out zone,
- a first slit connecting the cut-out zone to a peripheral edge of the first region;
- a second slit opening either onto a peripheral edge of the metal layer or into the cut-out zone, the second slit ending with a closed portion in the second region;
- and
- a second RF antenna electrically insulated from the metal layer and from the first RF antenna and configured to allow coupling to the first antenna, the second antenna comprising at least one turn facing the first slit;
- and
- a third RF antenna electrically insulated from the metal layer, from the first RF antenna and from the second RF antenna and configured to allow coupling to the first antenna, the third antenna comprising at least one turn located facing said second slit.
A method of manufacturing a chip card of generally rectangular shape from a card body formed at least in part by a metal layer, said metal layer comprising a cut-out zone, said metal layer consisting of a first region and a second region entirely delineated by a straight line parallel to a short side of the card, the first region completely containing the cut-out zone and its area being smaller than the area of the second region, a first slit in the metal layer connecting the cut-out zone to a peripheral edge of the first region and a second slit in the metal layer opening either onto a peripheral edge of the metal layer or into the cut-out zone, the second slit ending with a closed portion in the second region, the method comprising:
- forming, on or in the card body, a first RF antenna in or facing the cut-out zone of the metal layer;
- assembling an RF chip with the card body so that the RF chip is electrically connected to the first RF antenna;
- forming, on or in the card body, a second RF antenna so that the second RF antenna is electrically insulated from the metal layer and from the first RF antenna, the second antenna being configured to allow coupling to the first antenna, the second antenna comprising at least one turn located facing the first slit;
- and
- forming, on or in the card body, a third RF antenna so that the third RF antenna is electrically insulated from the metal layer, from the first RF antenna and from the second RF antenna, the third antenna being configured to allow coupling to the first antenna, the third antenna comprising at least one turn located facing the second slit.
Dependencies are inferred from the claim text.