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Material survey for a millimeter-wave absorber using a 3D-printed mold.

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    Researchers developed advanced radio absorptive materials (RAMs) for millimeter-wave receivers. Adding specific carbon fibers to epoxy resin significantly improved performance under cryogenic conditions, achieving low reflectance across a broad frequency range.

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    Area of Science:

    • Materials Science
    • Electromagnetics
    • Cryogenics

    Background:

    • Radio absorptive materials (RAMs) are crucial for millimeter-wave receivers.
    • A previous study established a 3D-printed mold method for RAM production, offering material flexibility.
    • Cryogenic conditions are essential for certain sensitive receiver applications.

    Purpose of the Study:

    • To evaluate the performance of various absorptive materials integrated into a base epoxy resin (STYCAST-2850FT).
    • To assess the optical performance of the resultant RAMs under cryogenic conditions (77 K).
    • To identify optimal RAM formulations for millimeter-wave applications within a wide frequency range.

    Main Methods:

    • Incorporation of diverse absorptive materials into a STYCAST-2850FT epoxy base.
    • Fabrication of RAM samples using a previously established 3D-printed mold technique.
    • Measurement of RAM reflectance across a 20-300 GHz frequency range at 77 K.

    Main Results:

    • The addition of a specific type of carbon fiber yielded the best radio absorptive properties.
    • The optimized RAM exhibited a reflectance of 0.01%-3% at 77 K.
    • This performance was maintained across the tested 20-300 GHz frequency spectrum.

    Conclusions:

    • A specific carbon fiber-enhanced epoxy resin provides excellent radio absorptive properties at cryogenic temperatures.
    • The 3D-printed mold method allows for flexible material selection to optimize RAM performance.
    • These findings are significant for developing advanced millimeter-wave receivers operating under cryogenic conditions.