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Reflection loss curves of paraffin composites containing 15 wt % (a), 30 wt % (b), and 45 wt % (c) Co/C, respectively; reflection loss curves of paraffin composites containing 5 wt % (d), 10 wt % (e), 12 wt % (f), 15 wt % (g), and 30 wt % (h) Co/C@PPy, respectively; Reflection loss curves of paraffin composites containing 10 wt % (i) under the thickness of 2.0 mm and 2.5 mm. The testing frequency range is from 2 to 18 GHz.
