A radio frequency identification label is comprised of a tag circuit 310 electrically
coupled to a defined marker region 330 such that the information generated
by the tag circuit is dependent on the electronic properties of the marker region
330. The ID information conveyed to an external tag reader is thus a combination
of fixed data intrinic to the tag circuit 310 plus a portion of data that
is dependent on the electronic properties of the marker region. The marker region
330 can be comprised of various materials with complex structure, such as
woven cloth or printed electrically conductive inks, such that the ID code transmitted
by the label is thus more difficult to reproduce or to counterfeit. In addition,
the marker region 330 can also be arranged to have electrical coupling to
the object onto which the label is affixed, thus creating an electronic ID code
that is also dependent on the electronic properties of the tagged object itself.
