Patent ID: 6304169
Filing Date: 2001-10-16
Classification: G06K

Abstract:
A tag which uses radio frequency waves transmitted from a scanning device in order to identify an item to which said tag is attached or with which said tag is associated, comprising:a first insulating layer having a top surface and a bottom surface;a plurality of resonant circuits formed on said first insulating layer, each of said plurality of resonant circuits formed on one of the top surface and the bottom surface of said first insulating layer and having a resonant frequency associated therewith, each of said plurality of resonant circuits including capacitance and inductance elements, said capacitance and inductance elements comprising an inwardly spiralled coil connected to an outwardly spiralled coil, each combination of the inwardly and the outwardly spiralled coils disposed on the same one of the top surface and bottom surface of said first insulating layer, wherein, in operation, each of said inwardly spiralled coil and said outwardly spiralled coil are coplanar with one another; andwherein said tag is associated with a binary number established by a pattern of ones and zeros depending on each circuits' resonance or nonresonance, respectively.