Device for shielding a transponder, method for producing a...

Details Device for shielding a transponder, method for producing a... Device for shielding a transponder, method for producing a...

2006-05-30

2006-05-30

Phan, Tho (Department: 2821)

Communications: radio wave antennas

Antennas

With electrical shield

C343S788000, C340S572500

Reexamination Certificate

active

07053854

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.

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