Electromagnetic identification system

Details Electromagnetic identification system Electromagnetic identification system

G - Physics

08

B

340/124.3

G08B 13/24 (2006.01) G06K 19/06 (2006.01)

Patent

CA 1301882

ABSTRACT OF THE DISCLOSURE A tag for use with an electromagnetic identification system includes a magnetic control component 1, having alternating regions 10, 20 of, respectively, high and medium coercivity material, and an element 30 of magnetically soft material. The element 30 may be polarised so as to deactivate the tag by, for example, selectively demagnetising the regions 20 of medium coercivity, such as by exposing the tag to an alternating magnetic field having an initial field strength which is intermediate between the coercivity of the regions 10, 20, which may be formed as a striped coating or from a number of discrete magnetic components.

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