Ultra-wideband radar stealth through magneto-electric synergy by building cortaderia selloana-like structured composite

This study presents a novel electromagnetic wave absorber with exceptional ultra-broadband performance, fabricated by in-situ coating flocculent polyaniline onto flake BaFe 12 O 19 (BaM). The optimally synthesized BaM component provides significant magnetic loss primarily through ferromagnetic resonance. Concurrently, the polyaniline coating contributes substantial dielectric loss via conduction loss, interface polarization, and dipole polarization. Critically, the composite's unique Cortaderia selloana -like hierarchical structure significantly enhances electromagnetic wave dissipation by promoting multiple scattering and prolonging the propagation path within the material. After meticulous optimization, the composite achieves an outstanding minimum reflection loss of −67.36 dB and an ultra-wide effective absorption bandwidth of 8.32 GHz at a remarkably low filler loading of only 30 wt%. Furthermore, practical radar cross-section simulations demonstrate a significant reduction of −20.55 dBm 2 , coupled with a narrowed detectable angle, confirming the composite's excellent potential for broadband radar stealth applications by making targets significantly harder to detect and identify.