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Area of Science:

  • Metamaterials and Metasurfaces
  • Electromagnetic Wave Manipulation
  • Terahertz (THz) Communication

Background:

  • Two-dimensional (2D) metamaterials control electromagnetic (EM) waves, with time-modulated phase-coded metasurfaces enabling spatial and frequency manipulation.
  • Current phase-coded metasurfaces face integration challenges above 100 GHz for next-generation wireless systems.

Purpose of the Study:

  • To propose and validate space-time 1-bit amplitude-coded metasurfaces for complex EM wave control.
  • To overcome limitations of phase-coded metasurfaces in high-frequency wireless communication.

Main Methods:

  • Implementation of graphene-based meta-atoms for reconfigurable 1-bit amplitude-coding via bias voltage.
  • Demonstration of beam steering with low sidelobe patterns through controlled amplitude and phase distributions.

Main Results:

  • Successful validation of space-time amplitude-coded metasurfaces for beam shaping.
  • Achieved desired effective amplitude and phase distributions for beam steering applications.

Conclusions:

  • The proposed amplitude-coded metasurfaces offer a viable solution for intelligent control in wireless communication.
  • This approach is expected to expand digital coding metasurface applications, especially in THz wireless systems.