A tag which uses radio frequency waves transmitted from a scanning device
in order to identify an item to which the tag is attached or with which
the tag is associated. The tag includes a first insulating layer having a
top surface and a bottom surface, and resonant circuits formed on the
first insulating layer. Each of the resonant circuits are formed on one of
the top surface and the bottom surface of the first insulating layer and
have a resonant frequency associated therewith. Each of the resonant
circuits include capacitance and inductance elements. The capacitance and
inductance elements include an inwardly spiralled coil connected to an
outwardly spiralled coil. The tag is associated with a binary number
established by a pattern of ones and zeros depending on each circuits'
resonance or nonresonance, respectively.
