Fabrication of CoFe/C@polypyrrole composites with efficient electromagnetic wave absorption properties

• CoFe/C@PPy composites were synthesized via a two-step process, combining magnetic CoFe/C fibers with a conductive polypyrrole coating. • The optimized composite achieves a minimum reflection loss of −45.6 dB at 14.64 GHz and an effective absorption bandwidth of 5.12 GHz at a low filling rate of 10%. • Synergistic effects of magnetic loss from CoFe/C and dielectric loss from PPy enhance impedance matching and EMW dissipation. • CST simulations and RCS analysis confirm practical radar stealth application with up to 37.5 dBm2 RCS reduction.