Composite microwave absorbers have been fabricated by Fe-filled carbon nanotubes (CNTs) and a W-type hexagonal ferrite. The microwave absorption of the absorbers can be tuned by matching the dielectric loss and the magnetic loss by changing the ratio of ferrite in the composites. The microwave absorbing properties of the absorber are evidently improved as compared with the absorber containing only CNTs or ferrite. The reflection loss of the composites with 40 wt% ferrite and 6.2 vol% CNTs at 2.0 mm thickness reached 21.9 dB at 8.5 GHz. The maximum absorption capability of 50.5 dB GHz was obtained at a ferrite concentration of 60 wt%. With the increase in the weight percentage of ferrite in the composites the resonance absorption peak shifted towards the lower frequency region.
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Gui et al. (2009) studied this question.
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