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Contour maps of reflection loss of the paraffin composites containing 5 wt % (a), 10 wt % (b), 12 wt % (c), and 15 wt % (d) Co/C@PPy and the calculated curves of tm according λ/4 model, respectively. The testing frequency range is from 2 to 18 GHz. (white line: region of −10 dB).
