Time-modulated 1-bit amplitude-coded metasurface for space-frequency beam shaping

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.