Electromagnetic shield to prevent surreptitious access to contactless smartcards
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United States of America Patent
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Sep 19, 2000
Grant Date -
N/A
app pub date -
Jan 15, 1998
filing date -
Jan 15, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An Electromagnetic Shield for Smartcards provides shielding of contactless smartcards or RFID tags from electromagnetic radiation which imparts energy to power the contactless smartcards or RFID tags and thus preventing surreptitious, wireless exchanges of digital data with a remote transceiver. The electromagnetic shield is made of a soft magnetic alloy with a very high initial and maximum magnetic permeability, which has been fully hydrogen annealed to develop optimum magnetic shielding properties. In the preferred embodiment, this magnetic shielding material is sandwiched between two plastic reinforcing shells which allow very thin shielding materials to be used with little regard for their resistance to permanent deformation. The relatively high intrinsic electrical conductivity of the magnetic shielding material sufficiently simulates a Faraday cage to further shield a contactless smartcard/RFID tag from electric fields as well. Four embodiments for contactless smartcards as well as one for a military identification tag and one for a pill shaped RFID tag are presented.
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