Multi-angle wideband radar wave incident experimental design of C_f/SiC_f orthogonally woven louver structures and synergistic multi-loss mechanisms

This paper utilizes a synergistic mechanism combining macro-scale impedance gradient and micro-component regulation to optimize surface impedance matching using silicon carbide fibers and carbon fibers. Orthogonally woven gradient samples were fabricated, achieving an effective absorption bandwidth of 7.82 GHz at a thickness of 3.6 mm with a minimum reflection loss of −21.75 dB. To precisely analyze the microscopic response mechanism of complex woven structures, a dual-polarization parameter inversion model based on generalized transmission line theory was established, enabling accurate extraction of electromagnetic parameters. A study on dielectric loss separation based on these parameters revealed that heterogeneous fibers form microscopic resistive-capacitive coupling networks at orthogonal weave nodes, significantly enhancing interfacial polarization effects. Quantitative loss analysis confirms that polarization relaxation loss accounts for 62.85% of total energy dissipation, exhibiting synergistic enhancement with conductive loss at resonance frequency. Furthermore, non-specular scattering and anisotropic electromagnetic response induced by the orthogonal weave texture endow the material with robust absorption characteristics below −8 dB across a broad angle range of 0°–70°. Compared to metal plates of equivalent dimensions, this material achieves significant radar cross-section reduction across the entire angular domain, offering novel insights for developing structurally integrated functional stealth materials.