Smartcard and method for the production of a smartcard
AssigneeSmartrac IP B.V.
InventorsManfred Rietzler, Philippe Castano
Life of this patent
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Abstract
The invention relates to a smartcard (30), particularly an electronic prepayment card, identification card or similar, with at least one transponder unit (28), and to a method for producing such a smartcard, wherein the transponder unit has at least one chip (33) and at least one antenna (31) connected to the chip, wherein the antenna is made from a conductor (36) that is arranged on an antenna substrate (29), wherein the extension of the antenna is limited to a patch of the antenna substrate and the antenna has a plurality of conducting leads (37, 38, 39, 40) with at least two windings separated from each other, which windings are arranged so that their axes are at least partly parallel to an axis of symmetry of the smartcard.
Claims8
A smartcard comprising:
- at least one transponder unit the transponder unit having at least one chip and at least one antenna connected to the chip, wherein the antenna is made from a conductor that is arranged on an antenna substrate, wherein the extension of the antenna is limited to a patch of the antenna substrate, and wherein the antenna includes has a plurality of conducting leads with at least two windings separated from each other, which windings are at least partly arranged so that their axes are parallel to an axis of symmetry of the smartcard, wherein at least one conducting lead is arranged asymmetrically with respect to at least one second conducting lead extending parallel thereto, in such manner that the winding distance of the first conducting lead differs from the winding distance of the second conducting lead, such that a resulting resonance frequency of the transponder unit corresponds to a frequency emitted by a reader unit, and that power matching takes place between the antenna and the chip.
A method for producing a smartcard with a transponder unit that includes at least one chip and at least one antenna, comprising:
- designing a resulting resonance frequency of the transponder unit, which is modified depending on the capacitance and impedance of the chip, to match a frequency emitted by a reader unit, and
- matching outputs of the antenna and the chip with the aid of an antenna, which is arranged on a substrate in such manner that least one conducting lead is arranged asymmetrically with respect to at least a second conducting lead extending parallel thereto, such that the winding distance of the first conducting lead differs from the winding distance of the second conducting lead.
Dependencies are inferred from the claim text.