Broadband wireless communication with space-time-varying polarization-converting metasurface

Area of Science:

• Metasurface technology
• Wireless communication systems
• Electromagnetics

Background:

• Conventional transmitters face limitations in bandwidth for wireless communication.
• Reconfigurable metasurfaces offer digital information encoding without complex radio-frequency chains.
• Existing metasurfaces often exhibit narrow operational bandwidths.

Purpose of the Study:

• To propose a broadband metasurface-based wireless communication system.
• To enable active adaptation to multiple users in diverse directions.
• To enhance regional signals and minimize signal leakage.

Main Methods:

• Joint modulation of digital signals in the time domain.
• Dynamic control of wave scattering in the space domain using metasurfaces.
• Real-time generation of highly directive beams for customized user support.

Main Results:

• Demonstrated a stable wireless communication service across a broad band (3.7-5.1 GHz).
• Successfully recovered transmitted color images at user terminals, enabled by time-varying spatial modulation.
• Achieved real-time, customized signal enhancement for desired user directions.

Conclusions:

• The proposed broadband metasurface system overcomes bandwidth limitations of conventional approaches.
• This technology offers significant potential for next-generation communication and radar systems.
• Key features include regional signal enhancement, user adaptability, and large channel capacity.