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A multimode, broadband and all-inkjet-printed absorber using characteristic mode analysis.

Dace Zha, Jianxiong Dong, Zhaowang Cao

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    This study presents a novel broadband microwave absorber fabricated using inkjet printing on a PET substrate. The designed absorber achieves over 90% absorption across a wide frequency range, demonstrating a practical fabrication method.

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    Area of Science:

    • Electromagnetics
    • Materials Science
    • Microwave Engineering

    Background:

    • Microwave absorbers are crucial for reducing electromagnetic interference and enhancing signal integrity.
    • Developing cost-effective and versatile fabrication methods for microwave absorbers remains an active research area.

    Purpose of the Study:

    • To demonstrate a multimode and broadband absorber fabricated using a commercial direct-to-garment (DTG) inkjet printer on a PET substrate.
    • To present a design procedure for such absorbers guided by characteristic mode theory.
    • To validate the absorber's performance through simulation and experimental measurements.

    Main Methods:

    • Analysis of modal behaviors using characteristic mode theory to guide the design.
    • Fabrication of the absorber directly on a PET substrate using a DTG inkjet printer.
    • Simulation and experimental measurement of the absorber's microwave absorption performance.

    Main Results:

    • The designed absorber exhibits two resonant modes at approximately 1.83 GHz and 4.28 GHz.
    • Achieved broadband microwave absorption efficiency over 90% from 1.0 GHz to 4.5 GHz.
    • Demonstrated a fractional bandwidth of 127.3% with a total thickness of 0.0883λL.

    Conclusions:

    • The proposed inkjet printing method is a viable and effective technique for fabricating broadband microwave absorbers.
    • The design approach based on characteristic mode theory is validated for creating multimode absorbers.
    • The method shows potential for application in other microwave and millimeter-wave devices.