Electromagnetic wave absorption enhancement of double-layer structural absorbers based on carbon nanofibers and hollow Co2Y hexaferrite microfibers

摘要: Abstract Novel double-layer microwave absorbers possessing excellent absorption performances have been designed based on carbon nanofibers (CNFs) and hollow Ba2Co2Fe12O22 microfibers (Co2Y MFs). The electromagnetic wave absorbing characteristics of with different layer thicknesses compositions are investigated over the 2–18 GHz range. Efficient coupling synergistic effects between matching lead to a better impedance in turn improve absorption. optimized structures exhibit far superior properties stronger intensity wider effective bandwidth compared corresponding single-layer ones. When (1.15 mm thickness) is filled 5 wt% CNFs (0.85 mm) 67 wt% Co2Y MFs, minimum reflection loss (RL) value of −85.5 dB achieved at 16.1 GHz RL less than −10 dB obtained 10.4–18 GHz. Conversely, as (1.75 mm) MFs (0.25 mm) CNFs, reaches −68.7 dB at 14.8 GHz frequency range values below −10 up 10 GHz (from 8 18 GHz). Moreover, position, peaks for can be readily tuned by adjusting stacking order, thickness each total absorber thickness, showing good potential practical application.