Akademik Veri Yönetim Sistemi
Brazilian Journal of Physics, cilt.54, sa.2, 2024 (SCI-Expanded, Scopus)
In this study, production of metamaterial-based polymer matrix composites was carried out for radar absorbing material. Metamaterial-based absorbers can be used in the stealth technology due to their negative index of refraction, broadband electromagnetic absorption. Electromagnetic metamaterials show negative magnetic permeability and electric permittivity. Splits on the loops (rings) can create high capacitances and can decrease the resonance frequency. Usually, split-ring loops are fabricated by coating thin conductive and nonmagnetic copper paths on a thin polymer. Thick carbon nanotube split-ring loops are embedded into polymer matrix instead of coating. This can have high radar absorption capacity, low density, and high strength. Positive moulds were fabricated by additive manufacturing. Replica method was used for the fabrication of metamaterial-based composites. Absorbance, conductivity, and mechanical properties were investigated. Distribution of the iron powders is uniform in the matrix. Increasing iron powder content increased the Young’s modulus of the composites. Iron addition increased the hardness and slightly decreased the impact energy. Increasing carbon nanotube content of the matrix increased the hardness and impact energy. Increasing carbon nanotube contents increased the insertion loss and absorbance. Maximum absorbance and insertion loss values were in the circular split-ring design. Insertion loss and absorbance values of the re-entrant and star shaped designs were lower.