Patent ID: 8636220

Claim:
A personal identification device comprising: a planar radio frequency identification element, the element including a flexible core having opposing first and second major opposing outer sides and formed from at least one strip of a flexible, porous polymer sheet material, and a planar radio frequency transponder assembly permanently and integrally fixed with at least an inner major side of the flexible, porous polymer sheet material, the at least one porous polymer sheet material core strip varying in thickness in the element, the at least one flexible, porous polymer sheet material core strip being thinned over the planar radio frequency transponder assembly in comparison to thicknesses of the at least one flexible, porous polymer sheet material core strip adjoining the planar radio frequency transponder assembly; and carrier means configured for holding the planar radio frequency identification element and for releasably securing the planar radio frequency identification element to a user to be identified by the planar radio frequency identification element.