Frontiers in Materials (Oct 2021)

Frequency-Diverse Holographic Metasurface Antenna for Near-Field Microwave Computational Imaging

  • Jiaqi Han,
  • Jiaqi Han,
  • Long Li,
  • Long Li,
  • Shuncheng Tian,
  • Xiangjin Ma,
  • Qiang Feng,
  • Qiang Feng,
  • Haixia Liu,
  • Haixia Liu,
  • Yu Zhao,
  • Yu Zhao,
  • Guisheng Liao

DOI
https://doi.org/10.3389/fmats.2021.766889
Journal volume & issue
Vol. 8

Abstract

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This article presents a holographic metasurface antenna with stochastically distributed surface impedance, which produces randomly frequency-diverse radiation patterns. Low mutual coherence electric field patterns generated by the holographic metasurface antenna can cover the K-band from 18 to 26 GHz with 0.1 GHz intervals. By utilizing the frequency-diverse holographic metasurface (FDHM) antenna, we build a near-field microwave computational imaging system based on reflected signals in the frequency domain. A standard horn antenna is adopted to acquire frequency domain signals radiated from the proposed FDHM antenna. A detail imaging restoration process is presented, and the desired targets are correctly reconstructed using the 81 frequency-diverse patterns through full-wave simulation studies. Compressed sensing technique and iterative shrinkage/thresholding algorithms are applied for the imaging reconstruction. The achieved compressive ratio of this computational imaging system on the physical layer is 30:1.

Keywords