Two-layered electromagnetic wave-absorbing E-glass/epoxy plain weave composites containing carbon nanofibers and NiFe particles

Two-layered radar-absorbing structures (RASs) were investigated for the broadband absorbing characteristics for the X-band (8.2–12.4 GHz) and Ku-band (12.0–18.0 GHz). E-glass/epoxy plain weave composites containing carbon nanofibers (CNFs) and submicron NiFe particles were fabricated and their complex permittivities and permeabilities measured in the range 2–18 GHz. The surface and absorbing layers of two-layered RASs consisted of the low and high lossy materials, respectively. Six kinds of two-layered RASs were designed through the parametric studies. The three kinds of specimens with wide absorption characteristics were selected for the experimental performance evaluations, and their results showed very broad 10 dB absorbing bandwidths of 8.9–9.7 GHz with thicknesses 3.15–3.43 mm.