Design and Performance of CNT-PMI Foam-Based Loss-Gradient Foam Multilayer Structure for RCS Reduction

초록

In this study, a CNT-PMI foam-based Loss-gradient foam multilayer structure (LGF-MS) with different permittivities was designed by controlling the CNT content. The electromagnetic (EM) wave absorption performance of the proposed structure was analyzed. The LGF-MS was designed to gradually vary the permittivity, minimizing impedance mismatch and maximizing EM wave penetration into the structure. Return loss (RL) simulation confirmed that the LGF-MS achieved broadband EM wave absorption performance comparable to the alternating CNC-FRP and foam multilayer structure (ACF-MS). Furthermore, RCS simulation results for the wing box leading edge (LE) region showed RCS reductions of 92% and 95% relative to the PEC reference under HH and VV polarization conditions, respectively, which were higher than those of the ACF-MS (86% and 94%, respectively). Power loss distribution simulation confirmed EM wave penetration with gradual dissipation at low frequencies, and concentrated energy absorption in the frontal region at high frequencies. The proposed CNT-PMI foam-based LGF-MS demonstrates its feasibility as a viable RAS design approach for aircraft structural components requiring broadband RCS reduction.

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