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Double square rings with different dimensions produce multiple absorption bands.

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    Researchers developed novel metamaterial absorbers with multiple absorption bands by adjusting double square ring dimensions. These millimeter-wave metamaterial absorbers offer flexible designs for various applications.

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    Area of Science:

    • Metamaterials
    • Electromagnetic Resonance
    • Microwave Engineering

    Background:

    • Traditional metamaterial absorbers often have fewer absorption bands than resonator units.
    • Electromagnetic resonance theory guides the design of novel absorption materials.

    Purpose of the Study:

    • To propose, fabricate, and measure three-millimeter-wave metamaterial absorbers (MWMAs) utilizing periodic double square ring (DSR) resonators.
    • To achieve multiple absorption bands (two, three, or four) by tuning DSR dimensions.
    • To investigate the physical mechanisms behind adjustable absorption bands.

    Main Methods:

    • Design and fabrication of MWMAs with DSRs.
    • Measurement of absorption spectra.
    • Analysis of electric field distributions at resonance frequencies.
    • Parametric studies on size and material effects.

    Main Results:

    • Successfully achieved multiple absorption bands (2, 3, and 4) by adjusting DSR dimensions.
    • Electric field analysis confirmed the complex interplay of LC, dipole, and surface responses in tunable absorption.
    • Demonstrated that absorption characteristics can be scaled across the spectrum via geometric control.

    Conclusions:

    • The proposed DSR-based MWMAs offer tunable multi-band absorption.
    • These absorbers exhibit potential for applications in electromagnetic devices, sensing, and functional materials due to their adaptable size, flexible design, and ease of fabrication.