Chipless RFID tags do not contain a chip or electronic circuit,
and thus store information purely in the electromagnetic materials
which comprise the tag. Since the absence of an electronic circuit
makes it more difficult to store information in a compact area,
chipless RFID tags are generally limited to a data capacity of less
than 32 bits, although in some cases more bits are possible.
For many applications, such as identifying classes of objects, a
large ID string is not necessary. In this case, where only a few
dozen or a few hundred different IDs are required, a chipless RFID
tag can be used.
TagSense has significant experience with several patented classes
of chipless RFID tags including:
Magnetoelastic resonant materials (magnetostricitive alloys)
Harmonic magnetic materials
Multi-resonant LC planar structures