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Rational design of thickness-gradient BC-derived carbon nanofiber/Sr2FeReO6 bilayers for ultrathin broadband Ka-band microwave absorption

Sadok MehrezDepartment of Mechanical Engineering, College of Engineering at Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj, 11942, Saudi ArabiaMohamad Reda A. RefaaiDepartment of Mechanical Engineering, College of Engineering at Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj, 11942, Saudi ArabiaErkin KholiyarovDepartment of Information Technology and Exact Sciences, Termez University of Economics and Service, Termez, Uzbekistan

2026en

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ABI

Annotatsiya

An ultrathin Ka-band bilayer microwave absorber was designed by integrating a BC-derived carbon nanofiber/Sr 2 FeReO 6 (BC-SFReO) composite as the incident layer with Sr 2 FeReO 6 as the magnetic-loss layer. The electromagnetic properties of the individual single-layer composites were experimentally measured and incorporated as constitutive inputs into a MATLAB-based transmission-line model to determine the optimum thickness distribution. The interconnected carbon nanofiber network promoted uniform anchoring of Sr 2 FeReO 6 nanoparticles and generated abundant carbon/perovskite interfaces, thereby enhancing interfacial polarization and dielectric dissipation. The numerical optimization identified a total thickness of 0.70 mm, for which the bilayer exhibited a predicted minimum reflection loss of −48.7 dB at 29.7 GHz and an effective absorption bandwidth of 12.6 GHz, covering nearly the entire Ka-band. These results demonstrate the potential of experimentally informed thickness-gradient design for lightweight biomass-derived microwave absorbers, while the fabrication and direct experimental validation of the optimized bilayer remain to be addressed in future work.

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DOI: 10.1016/j.vacuum.2026.115791

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