Multiple synergistic losses in the absorption of electromagnetic waves by three-dimensional cross-linked carbon fiber

FeCo/Graphene Nanocomposites for Applications as Electromagnetic Wave-Absorbing Materials

“…In general, if the magnetic loss mode of the absorber is dominated by the eddy current loss, then the following relationship is satisfied false( μ false′ false) − 2 μ ″ f − 1 = 2 π μ 0 d 2 σ where d is the thickness of the sample and μ 0 is the vacuum permeability. It can be seen that when the eddy current loss is dominated by the magnetic loss, 2π μ 0 d 2 σ is a fixed value that does not change with frequency. ,, The variation of ( μ ′) −2 μ ″ f –1 with frequency is shown in Figure g. It can be seen that the ( μ ′) −2 μ ″ f –1 values of different samples show an obvious downward trend in the 2–10 GHz band, and there are large fluctuations, indicating that the loss mode of the samples in the 2–10 GHz band is dominated by natural resonance loss.…”

“…It can be seen that when the eddy current loss is dominated by the magnetic loss, 2πμ 0 d 2 σ is a fixed value that does not change with frequency. 22,41,43 The variation of (μ′) −2 μ″f −1 with frequency is shown in Figure 5g. It can be seen that the (μ′) −2 μ″f −1 values of different samples show an obvious downward trend in the 2−10 GHz band, and there are large fluctuations, indicating that the loss mode of the samples in the 2−10 GHz band is dominated by natural resonance loss.…”

Lightweight electromagnetic wave absorbent composites with Fe3O4 nanocrystals uniformly decorated on the surface of carbon spheres

“…This has been demonstrated in our previous work by the study of graphite defects in carbon-based materials. 19…”

“…This has been demonstrated in our previous work by the study of graphite defects in carbon-based materials. 19 The electromagnetic wave absorbent properties of materials can be evaluated by calculating the reflection loss (RL) values based on transmission line theory from eqns. 1-3: [40][41][42][43] RLðdBÞ ¼ 20 log…”

“…[8][9][10][11] Conventional electromagnetic wave absorbent materials can be divided into magnetic loss and dielectric loss materials. Dielectric loss materials such as TiO 2 , 2,12,13 ZnO, 10,14,15 ZnS, 16 CuO, 17,18 and carbon materials 9,[19][20][21][22] have good electromagnetic wave loss capabilities due to their high dielectric loss tangent values. However, the high dielectric constants of single dielectric loss materials often lead to impedance mismatches, limiting their development as electromagnetic wave absorbent materials.…”