High-Efficiency Microwave Wireless Power Transmission via Reflective Phase Gradient Metasurfaces and Surface Wave...

Area of Science:

• Electrical Engineering
• Electromagnetics
• Materials Science

Background:

• Microwave Wireless Power Transfer (MWPT) is vital for remote and emergency power.
• Conventional MWPT systems face challenges with low efficiency, complex design, and manufacturing.

Purpose of the Study:

• To introduce an efficient microwave energy receiver design using Reflective Phase Gradient Metasurfaces (R-PGMs).
• To overcome limitations of traditional antenna arrays in MWPT systems.

Main Methods:

• Utilized R-PGMs for plane wave-to-surface wave conversion.
• Employed surface wave energy convergence with a circular array.
• Optimized R-PGM parameters for a 60° phase gradient.
• Integrated components into a hybrid antenna array with a matched output port.

Main Results:

• Achieved 85.32% microwave-to-surface wave conversion efficiency in simulations.
• Demonstrated 68.26% collection efficiency and 64.68% peak energy collection efficiency experimentally at 5.8 GHz.
• Attained 42% RF-to-DC conversion efficiency.
• Significantly simplified system design by eliminating complex combining networks.

Conclusions:

• The R-PGM-based design offers a simplified and highly efficient solution for MWPT.
• This technology enhances energy capture and conversion for off-grid and emergency power applications.