Gravity-induced Sedimentation Behavior and Broadband Absorption/Surface Wave Attenuation of Magnetodielectric Absorbents

ZHAO Junfeng; WU Jinxin; CHEN Zhihong

doi:10.19554/j.cnki.1001-3563.2026.13.037

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (13) : 343-358. DOI: 10.19554/j.cnki.1001-3563.2026.13.037

Gravity-induced Sedimentation Behavior and Broadband Absorption/Surface Wave Attenuation of Magnetodielectric Absorbents

ZHAO Junfeng, WU Jinxin, CHEN Zhihong^*

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Abstract

The work aims to design composite microwave absorbing materials based on gravity-induced sedimentation and develop novel systems with strong absorption and surface wave attenuation. The gravity-induced sedimentation of high-dielectric carbon fiber (CF) and low-frequency FeSiAl alloy powders in epoxy resin was exploited to regulate dispersion, forming gradients in density and electromagnetic parameters. An external shape gradient was further introduced to achieve broadband absorption and surface wave attenuation. The gravity-induced sedimentation behavior and broadband electromagnetic performance of CF and FeSiAl absorbents were investigated, and a FeSiAl/CF composite absorber system was constructed. Under various conditions, the gradient achieved a density variation of 1.0-2.0 g/cm³ from surface to bottom. In the 0.1-2 GHz range, the real permittivity varied from 5.27 to 67.06, imaginary permittivity from 0.95 to 10.64, real permeability from 1.07 to 5.25, and peak imaginary permeability from 0.24 to 1.70. The effective absorption bandwidth was significantly broadened, and the surface wave attenuation rate increased by 38.4%-148% compared to uniform absorbers. In conclusion, constructing internal electromagnetic gradients via gravity-induced sedimentation markedly enhances both absorption and surface wave attenuation of the FeSiAl/CF composite system.

Key words

composite microwave absorbing materials / gravity-induced sedimentation / broadband absorption / surface wave attenuation

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ZHAO Junfeng, WU Jinxin, CHEN Zhihong. Gravity-induced Sedimentation Behavior and Broadband Absorption/Surface Wave Attenuation of Magnetodielectric Absorbents[J]. Packaging Engineering. 2026, 47(13): 343-358 https://doi.org/10.19554/j.cnki.1001-3563.2026.13.037

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