A multimode metamaterial for a compact and robust dualband wireless power transfer system

Area of Science:

• Electrical Engineering
• Materials Science
• Electromagnetics

Background:

• Growing demand for flexible charging solutions has driven research into compact wireless power transfer (WPT) systems.
• Existing dual-band WPT systems offer simultaneous power and signal transfer, while stacked metasurfaces have been explored for single-band near-field WPT.
• Advancements are needed to enhance the performance and robustness of dual-band WPT systems.

Purpose of the Study:

• To propose a novel multimode self-resonance-enhanced wideband metasurface for robust dual-band WPT.
• To significantly improve the performance of both power and signal transfer bands in a WPT system.
• To demonstrate a compact WPT system with enhanced efficiency and figure of merit (FoM).

Main Methods:

• Design and fabrication of a compact, wideband metasurface for dual-band WPT.
• Integration of the metasurface into transmitter (Tx) and receiver (Rx) modules, each measuring 15 mm × 15 mm.
• Experimental measurement of WPT efficiency and figure of merit (FoM) at different frequencies and modes.

Main Results:

• The proposed metasurface improved WPT efficiency from 0.04% up to 39% in optimal conditions.
• Measured FoM reached 2.09 at 390 MHz and 2.16 at 770 MHz in balanced mode.
• The FoM achieved up to 4.34 in the lower frequency mode, demonstrating significant performance gains.

Conclusions:

• The novel multimode metasurface enables robust and high-performance dual-band WPT.
• The compact size and improved efficiency offer significant advantages over existing WPT technologies.
• This research paves the way for more versatile and efficient wireless charging solutions for portable devices.