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Broadband reflective wavefront manipulation enabled by a polarization-twisting design method.

Wu-Guang Zhao, Yantao Ao, Zhi Hao Jiang

    Optics Express
    |June 11, 2026
    PubMed
    Summary
    This summary is machine-generated.

    A simplified design for circularly polarized (CP) reflective wavefront-manipulation arrays uses rotational polarization-twisting (PT) meta-atoms. This approach optimizes PT efficiency, reducing design complexity for broadband CP control.

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    Area of Science:

    • Electromagnetics and Metamaterials
    • Antenna Engineering
    • Wavefront Manipulation

    Background:

    • Designing circularly polarized (CP) reflective wavefront-manipulation arrays typically involves complex dual-objective optimization for reflection magnitude and phase.
    • Existing methods face challenges in simplifying the design process for efficient polarization conversion.

    Purpose of the Study:

    • To present a simplified design approach for CP reflective wavefront-manipulation arrays.
    • To introduce a method utilizing rotational polarization-twisting (PT) meta-atoms for controllable CP reflection phase.
    • To reduce the complexity of meta-atom design by focusing on a single optimization objective.

    Main Methods:

    • Theoretical analysis of a PT meta-atom for efficient linear-to-orthogonal polarization conversion.
    • Development of a wideband PT meta-atom by combining complementary current modes.
    • Design and experimental validation of a Ka-band CP reflective array (RA) using 16x16 PT meta-atoms.

    Main Results:

    • The proposed PT meta-atom enables controllable CP reflection phase through physical rotation.
    • A wideband PT meta-atom demonstrated efficient polarization conversion.
    • The fabricated Ka-band CP RA achieved a 3-dB gain bandwidth of 38.6% (26.8–39.6 GHz), >40% 3-dB axial ratio bandwidth, and 40.1% maximum aperture efficiency.
    • The array maintained a low profile of 0.1λ₀.

    Conclusions:

    • The presented methodology offers a significantly simplified and practical approach for designing broadband CP reflective wavefront-manipulation arrays.
    • Optimizing PT efficiency as a single objective transforms a complex dual-objective problem, facilitating easier meta-atom design.
    • The experimental results validate the effectiveness of the proposed PT meta-atom concept for advanced antenna applications.