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Conformal high-efficiency ultra-thin flexible rectifying metasurface with a simple structure.

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    |January 29, 2025
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    This study introduces a flexible metasurface for efficient wireless power transfer, demonstrating high efficiency across various conditions. The design is polarization-insensitive and works at wide angles, simplifying wireless charging systems.

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    Area of Science:

    • Electromagnetics and Metamaterials
    • Wireless Power Transfer
    • Flexible Electronics

    Background:

    • Wireless power transfer (WPT) systems require efficient rectifying antennas (rectennas) to convert electromagnetic energy to DC power.
    • Existing rectennas often struggle with polarization sensitivity, limited acceptance angles, and bulky structures, hindering practical applications.
    • Metasurfaces offer a promising platform for designing advanced electromagnetic devices with tailored properties.

    Purpose of the Study:

    • To propose and demonstrate a conformal, high-efficiency, ultra-thin, and flexible rectifying metasurface (RMS) for wireless power transfer.
    • To achieve polarization insensitivity and wide-angle incidence capabilities in the RMS.
    • To simplify the RMS structure and power combining network for improved system integration.

    Main Methods:

    • Designed a rotationally symmetric RMS unit with double rings and cross-shaped elements, incorporating diodes for rectification.
    • Achieved polarization insensitivity by placing diodes in the gap of the cross-shaped structure.
    • Optimized the "double ring and cross" structure dimensions for impedance matching, eliminating the need for a separate matching network.
    • Integrated diodes and inductors for inter-unit connection and DC pathway formation.
    • Fabricated a 6x6 unit RMS on a 0.6 mm flexible polyimide substrate.

    Main Results:

    • The fabricated RMS achieved a system efficiency exceeding 66.26% at 5.8 GHz under various polarizations.
    • System efficiency remained above 50.42% for incident angles from 0° to 30°.
    • An efficiency of 68.18% was recorded at an incident power density of 0.796 mW/cm².
    • Even when conformed to a cylindrical radius of 100 mm, the system efficiency stayed above 35.44%.

    Conclusions:

    • The proposed conformal RMS offers a simple, high-efficiency solution for wireless power transfer.
    • The design's polarization insensitivity and wide-angle capabilities enhance its practicality for diverse WPT applications.
    • The ultra-thin and flexible nature of the RMS enables integration into various surfaces and form factors.