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Fully planar high-order frequency selective surface with quasi-elliptical response using multimodal structure.

Zhenlin Li, Yin Li, Ruixiang Liao

    Optics Express
    |February 20, 2026
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    Summary
    This summary is machine-generated.

    We developed a planar high-order frequency selective surface (FSS) using multimode resonators (MMRs). This novel design achieves a quasi-elliptic bandpass response with high selectivity and low profile, demonstrating excellent filtering performance.

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    Area of Science:

    • Electromagnetics and Metamaterials
    • Microwave Engineering
    • Filter Design

    Background:

    • Frequency Selective Surfaces (FSS) are crucial for electromagnetic wave filtering.
    • Traditional FSS designs often face limitations in selectivity and profile height.
    • Achieving high-order filter responses with sharp roll-offs remains a design challenge.

    Purpose of the Study:

    • To propose and demonstrate a fully planar high-order FSS with a quasi-elliptic bandpass response.
    • To realize finite-frequency transmission zeros (TZs) near the passband edges for enhanced selectivity.
    • To investigate the use of multimode resonators (MMRs) and coupling-matrix theory for advanced filter design.

    Main Methods:

    • Design of a unit cell employing a resonator-dual-mode-resonator configuration.
    • Synthesis of cross-coupling paths guided by a coupling-matrix formulation to achieve transmission zeros.
    • Utilizing coupling-matrix theory to analyze operating mechanisms and predict performance.
    • Fabrication and measurement of a planar prototype.

    Main Results:

    • Experimental demonstration of a planar high-order FSS with a quasi-elliptic bandpass response.
    • Achieved finite-frequency transmission zeros near the passband edges, enhancing selectivity.
    • Measured performance shows four transmission poles and two transmission zeros, closely matching simulations.
    • Obtained a 3-dB fractional bandwidth (FBW) of 11.5% with a low profile of 0.14λ₀.

    Conclusions:

    • The proposed planar FSS based on MMRs offers high-order filtering with a quasi-elliptic response and high selectivity.
    • The design achieves a low profile and simple, low-cost fabrication.
    • Coupling-matrix theory provides an effective framework for understanding and optimizing such high-order FSS designs.