High-Efficiency Wireless-Power-Transfer System Using Fully Rollable Tx/Rx Coils and Metasurface Screen.

Area of Science:

• Electrical Engineering
• Materials Science
• Electromagnetics

Background:

• Wireless power transfer (WPT) systems face challenges in efficiency and range.
• Existing WPT solutions often lack flexibility and reconfigurability.
• Metasurfaces (MS) offer potential for electromagnetic field manipulation.

Purpose of the Study:

• To develop a high-efficiency, reconfigurable WPT system.
• To investigate the use of metasurface (MS) screens for enhancing WPT performance.
• To demonstrate a flexible WPT system with rollable components.

Main Methods:

• Integration of fully rollable transmitter (Tx) and receiver (Rx) coils.
• Placement of metasurface (MS) screens between Tx and Rx coils.
• Operation at a frequency of 6.78 MHz.
• System performance evaluation at various power-transfer distances (PTD) and with multiple MS screens.

Main Results:

• Significant enhancement in power-transfer efficiency (PTE) using MS screens across different PTDs.
• PTE increased from 13.32% to 32.49% at 40 cm with one MS screen.
• PTE increased from 5.42% to 42.25% at 50 cm with two MS screens.
• Demonstrated improved PTE and PTD, and maintained efficiency under misalignment conditions.

Conclusions:

• The proposed MS-based WPT system offers high efficiency and extended range.
• The reconfigurable and rollable nature of the system allows for flexible spatial deployment.
• Metasurface screens are effective in magnifying PTE and PTD, even in misaligned scenarios.