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Large Metasurface Aperture for Millimeter Wave Computational Imaging at the Human-Scale.

J N Gollub1,2, O Yurduseven1,2, K P Trofatter1,2

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We developed a compact holographic imaging system using frequency-diverse metasurfaces for millimeter-wave imaging. This system reconstructs detailed images of subjects by analyzing diverse field patterns, overcoming computational challenges for large apertures.

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Area of Science:

  • Millimeter-wave imaging
  • Metasurface technology
  • Computational imaging

Background:

  • Holographic imaging systems often face challenges with size and computational complexity.
  • Metasurfaces offer novel ways to manipulate electromagnetic waves at millimeter wavelengths.

Purpose of the Study:

  • To demonstrate a low-profile holographic imaging system at millimeter wavelengths.
  • To reconstruct diffraction-limited images of human-sized subjects using frequency-diverse metasurfaces.

Main Methods:

  • Utilized an aperture composed of frequency-diverse metasurfaces.
  • Employed a single microwave source swept over a frequency band (17.5-26.5 GHz).
  • Switched between transmit and receive metasurface panels, measuring spatially diverse field patterns.

Main Results:

  • Successfully reconstructed diffraction-limited images of human-sized subjects.
  • Developed computational methods and calibration approaches to address scaling challenges.
  • Enabled rapid and accurate imaging performance for electrically large, coherent apertures.

Conclusions:

  • The demonstrated system offers a viable low-profile solution for millimeter-wave holographic imaging.
  • Advanced computational techniques are crucial for high-fidelity image reconstruction in such systems.
  • This approach overcomes inherent scaling challenges in computational imaging.