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Electromagnetic and mechanical properties of laser-induced graphene/aramid fabric composite and the design of a high-efficiency broadband radar absorbing structure
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DOI：10.1016/j.compositesa.2026.110168.png)
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Abstract
En 中文
To achieve conventionally difficult-to-achieve enhanced permittivity beneficial for stealth applications, a high-dielectric material was readily fabricated via single-step direct-writing of laser-induced graphene (LIG) onto an entire aramid fabric. Variations in the permittivity and mechanical performance arising from the laser treatment were evaluated. With the progressive LIG conversion, the complex permittivity varied accordingly, demonstrating that high-dielectric materials with controllable properties can be readily fabricated by adjusting the laser power in a single-step process. Meanwhile, the mechanical properties generally deteriorated, with the greatest decreases in tensile strength and stiffness, reaching 35% and 28%, respectively, indicating a trade-off between electromagnetic absorption and structural performance. We designed a 4.8 mm-thick double-layer broadband radar absorbing structure (RAS) incorporating an LIG/aramid fabric-based high-dielectric layer. It achieved a 6.8 GHz bandwidth (≤−10 dB) across C, X, and Ku-bands, with high-efficiency absorption (≤−20 dB) over 3.6 GHz around the X-band, indicating excellent margin for robust absorption under varied incidence. Experimentally, it exhibited polarization-insensitive behavior and stable absorption under high-oblique incidence. Simulations under multi-reflection conditions confirmed effective radar cross section (RCS) reduction. These results demonstrate the potential of an LIG/aramid fabric-based material system for next-generation stealth composites.
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