  A passive chipless Radio-frequency identification (RFID) tag based on
log-periodic (LP) dipole array is proposed, where the tailorable band-rejection
property of the LP aperture is utilized to realize large number of codes. The
proposed tag principle is successfully validated using measurements, where the
absence and presence of the band-rejection, is shown to carry the bit
information. Its fabrication simplicity is also demonstrated by its
implementation on a flexible substrate. Finally, two different tag formation
schemes, based on specific set of resonance suppressions, are discussed in
detailed.
