VO₂-based ultra-reconfigurable intelligent reflective surface for 5G applications.

Area of Science:

• Materials Science
• Electrical Engineering
• Telecommunications

Background:

• Increasing demand for wireless capacity necessitates innovative solutions.
• Current radio platforms and signal generation power consumption limit advancements.
• Reconfigurable Intelligent Surfaces (RIS) offer a promising avenue for wireless communication enhancement.

Purpose of the Study:

• To propose and investigate an Ultra-Reconfigurable Intelligent Surface (URIS) platform.
• To leverage the metal-to-insulator transition property of Vanadium Dioxide (VO2) for dynamic surface reconfiguration.
• To assess the feasibility of the proposed URIS for 5G applications.

Main Methods:

• Fabrication of a URIS platform using a VO2 layer on a micro-heater matrix.
• Utilizing electronic switching of micro-heaters to induce localized heating and phase transition in VO2.
• Numerical investigation of heat-activated switching and RF reflection characteristics at 32 GHz.
• Design of a reflectarray with 40x40 μm heating pixels for ~100x100 μm spatial resolution.

Main Results:

• Achieved dynamic control over the reflective surface shape with high speed.
• Demonstrated a large phase range of approximately 300°.
• Observed approximate RF losses of -2 dB at 32 GHz.
• Validated the heat-activated switching and RF reflection properties of the VO2-based URIS.

Conclusions:

• The proposed VO2-based URIS platform offers a novel solution for ultra-reconfigurable reflectarrays and other Intelligent Reflecting Surfaces (IRS).
• This technology has the potential to significantly enhance wireless communication capacity and performance.
• The device is suitable for various wide spectral range RF applications, including 5G.