Figure 1

Double-layer structure of ferrite/carbon black composites with (a) 1 mm ferrite/1 mm carbon black (F1/CB1), (b) 2 mm ferrite/1 mm carbon black (F2/CB1) and (c) 1 mm carbon black/1 mm ferrite (CB1/F1) and (d) 1 mm carbon black/ 2 mm ferrite (CB1/F2) thickness. In the diagrams, ML and AL are abbreviations for matching and absorbing layers, respectively.