Cycle-dependent interface engineering in carbon/alumina composites: Bridging low-frequency absorption and curved structure radar signature prediction

The development of low frequency electromagnetic wave absorbers has become critically imperative for next generation radar stealth technologies, particularly given the inherent limitations of conventional planar-structured absorbers in achieving effective absorption across a wide frequency range. By systematically adjusting the number of Al₂O₃ sol impregnation and thermal treatment cycles in carbon fiber felts, a high-performance absorber, CA-5 (C/Al₂O₃-5), was developed, demonstrating efficient low-frequency absorption centered at 2.00 GHz. The material exhibited outstanding low-frequency electromagnetic wave absorption performance, indicating its promising potential for practical implementation in radar reconnaissance systems. This research introduced an innovative modification to the traditional Radar Cross Section (RCS) simulation model by integrating a curved surface approach. This enhancement offered a more precise and adaptable framework for modeling RCS, particularly in the context of complex electromagnetic wave interactions with low-frequency, curved absorbing materials. The findings offered valuable insights for both theoretical research and practical applications in the field of radar technology.