Abstract
Magnetized (PANI-coated Fe3O4) epoxy resin was synthesized to produce $X$ -band microwave absorbing structures (MASs) with tuning thickness and fillers ratio. The structure and crystallinity of materials were checked by SEM and X-ray diffraction. It was found that the thickness, amount, and ratio of magnetized PANI-coated Fe3O4 affect the microwave absorption properties. Single layer MAS with 3 mm showed a reflection loss (RL) of −54 dB at 8.73 GHz and −41 dB at 9.52 GHz. However, a double-layer absorber based on 0.9 mm of the matching layer of PANI and the absorbing layer of magnetized (PANI-coated Fe3O4) epoxy resin composite with a thickness of 1.8 mm show a minimum RL value of −38 dB at 9.82 GHz and an absorption bandwidth of about 3.55 GHz with RL below −10 dB. In addition, by rising thicknesses the RL peak shift to lower frequency. A materials prepared with thin double-layer structure have a high absorption performances and broader bandwidth in $X$ -band.
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