Wideband fractal antennas for holographic imaging and rectenna applications

Kyle J. Bunch; Douglas L. McMakin; David M. Sheen

doi:10.1117/12.778265

18 April 2008 Wideband fractal antennas for holographic imaging and rectenna applications

Kyle J. Bunch, Douglas L. McMakin, David M. Sheen

Proceedings Volume 6948, Passive Millimeter-Wave Imaging Technology XI; 69480B (2008) https://doi.org/10.1117/12.778265
Event: SPIE Defense and Security Symposium, 2008, Orlando, Florida, United States

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.

Citation Download Citation

Kyle J. Bunch, Douglas L. McMakin, and David M. Sheen "Wideband fractal antennas for holographic imaging and rectenna applications", Proc. SPIE 6948, Passive Millimeter-Wave Imaging Technology XI, 69480B (18 April 2008); https://doi.org/10.1117/12.778265

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