Microwave absorbing properties and structural design of microwave absorbers based on polyaniline and polyaniline/magnetite nanocomposite

Double layer absorbers with enhanced microwave absorbing properties wore designed based on polyaniline and polyaniline/magnetite composite with a total thickness of 1 mm. The double-layer microwave absorbers have better microwave absorbing properties than those of single-layer microwave absorbers, and the microwave absorbing properties of the double-layer structure are influenced by the coupling interactions between the absorbing layer and matching layer. When the absorbing layer is PANl with a thickness of 0.4 min, and the matching layer is PANI/Fe3O4 composite with a thickness of 0.6 min, the minimum reflection loss (R-L) reaches -42 dB at 29.27 GHz and the absorption bandwidth with R-L below -10 dB is about 11.8 GHz. While when PANl and PANI/Fe3O4 composite are acted as matching layer and absorbing layer, respectively, with the same thickness of 0.5 mm, a minimum R-L value of -54 dB is observed at 33.72 GHz and the absorption bandwidth is about 11.28 GHz ranging from 27.24 to 38.52 GHz with the R-L value below 10 dB. Crown Copyright (C) 2014 Published by Elsevier B.V. All rights reserved.