Device for shielding a transponder, method for producing a corresponding shielding and transponder provided with said shielding
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Accused Products
Abstract
A unit for shielding a transponder includes at least a chip and an antenna structure with application-specific spatial dimensions and which is secured to an electrically conductive surface. The unit includes a film having formed thereon or therein a highly permeable material at least in an area having the spatial dimensions of the antenna structure of the transponder. The highly permeable material is subdivided into elongate shielding elements and free spaces arranged between the respective shielding elements such that when the substrate has been attached to the transponder, the shielding elements will be oriented parallel to a magnetic field induced in the antenna structure of the transponder, so as to suppress eddy currents which are generated by the electrically conductive surface in the antenna structure, when the transponder is being introduced in a magnetic field of a respective reading device.
14 Citations
60 Claims
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1-30. -30. (canceled)
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31. A method of producing a shielding for a transponder, which comprises at least a chip and an antenna structure with application-specific spatial dimensions, the shielding being formed on a substrate, said method comprising:
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applying ferromagnetic particles to an area of the substrate having at least the spatial dimensions of the antenna structure of the transponder;
orienting the ferromagnetic particles by a constant magnetic field in such a way that, when the substrate has been attached to the transponder, the particles will be oriented parallel to a magnetic field induced in the antenna structure of the transponder; and
fixing the oriented particles. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A unit for shielding a transponder, which comprises at least a chip and an antenna structure with application-specific spatial dimensions and which is attached to an electrically conductive surface, said unit comprising:
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a substrate having formed thereon a plurality of fixed ferromagnetic particles in an area having at least the spatial dimensions of the antenna structure of the transponder;
whereinthe respective ferromagnetic particles are oriented such that when the substrate has been attached to the transponder, the ferromagnetic particles will be oriented parallel to a magnetic field induced in the antenna structure of the transponder so as to suppress eddy currents which are generated by the electrically conductive surface in the antenna structure when the transponder is being introduced in a magnetic field of a respective reading device. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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60. A unit for shielding a transponder, which comprises at least a chip and an antenna structure with application-specific spatial dimensions and which is attached to an electrically conductive surface, said unit comprising:
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a film having formed thereon or therein a highly permeable material at least in an area having the spatial dimensions of the antenna structure of the transponder;
whereinthe highly permeable material is subdivided into elongate shielding elements and free spaces arranged between the respective shielding elements such that when the substrate has been attached to the transponder, the shielding elements will be oriented parallel to a magnetic field induced in the antenna structure of the transponder so as to suppress eddy currents which are generated by the electrically conductive surface in the antenna structure when the transponder is being introduced in a magnetic field of a respective reading device.
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Specification