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Proceedings Paper

Wideband fractal antennas for holographic imaging and rectenna applications
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Paper Abstract

At Pacific Northwest National Laboratory, wideband antenna arrays have been successfully used to reconstruct three-dimensional images at microwave and millimeter-wave frequencies. Applications of this technology have included portal monitoring, through-wall imaging, and weapons detection. Fractal antennas have been shown to have wideband characteristics due to their self-similar nature (that is, their geometry is replicated at different scales). They further have advantages in providing good characteristics in a compact configuration. We discuss the application of fractal antennas for holographic imaging. Simulation results will be presented. Rectennas are a specific class of antennas in which a received signal drives a nonlinear junction and is retransmitted at either a harmonic frequency or a demodulated frequency. Applications include tagging and tracking objects with a uniquely-responding antenna. It is of interest to consider fractal rectenna because the self-similarity of fractal antennas tends to make them have similar resonance behavior at multiples of the primary resonance. Thus, fractal antennas can be suited for applications in which a signal is reradiated at a harmonic frequency. Simulations will be discussed with this application in mind.

Paper Details

Date Published: 18 April 2008
PDF: 5 pages
Proc. SPIE 6948, Passive Millimeter-Wave Imaging Technology XI, 69480B (18 April 2008); doi: 10.1117/12.778265
Show Author Affiliations
Kyle J. Bunch, Pacific Northwest National Lab. (United States)
Douglas L. McMakin, Pacific Northwest National Lab. (United States)
David M. Sheen, Pacific Northwest National Lab. (United States)

Published in SPIE Proceedings Vol. 6948:
Passive Millimeter-Wave Imaging Technology XI
Roger Appleby; David A. Wikner, Editor(s)

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