Recently, there has been considerable interest in the area of Radio Frequency Identification (RFID) and Radio
Frequency Tagging (RFTAG). This emerging area of interest can be applied for inventory control (commercial) as well
as friend/foe identification (military) to name but a few. The current technology can be broken down into two main
groups, namely passive and active RFID tags. Utilization of Space-Filling Curve (SFC) geometries, such as the Peano
and Hilbert curves, has been recently investigated for use in completely passive RFID applications [1, 2]. In this work,
we give an overview of our work on the space-filling curves and the potential for utilizing the electrically small,
resonant characteristics of these curves for use in RFID technologies with an emphasis on the challenging issues
involved when attempting to tag conductive objects. In particular, we investigate the possible use of these tags in
conjunction with high impedance ground-planes made of Hilbert or Peano curve inclusions [3, 4] to develop electrically
small RFID tags that may also radiate efficiently, within close proximity of large conductive objects [5].
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