Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10639939 | Materials Science and Engineering: B | 2005 | 5 Pages |
Abstract
BaTiO3-polyaniline composites with different mixture ratios, 75/25, 50/50 and 25/75, have been prepared in polyurethane resin, keeping pigment to volume concentration (PVC) constant as â¼25 in all the samples. For this, BaTiO3 powder by oxide route and polyaniline by chemical oxidation route have been synthesized. The complex permittivity (εâ²râjεâ³r) and reflection loss (dB) of the composites have been measured at different microwave frequencies in X-band (8.2-12.4 GHz) employing vector network analyzer model PNA E8364B and software module 85071. Reflection loss (dB) has been calculated for different thicknesses of the composites using measured values of εâ²r and εâ³r. It is found that the absorption properties of the composite improve with increasing % of polyaniline. A maximum reflection loss of â15 dB (97% power absorption) at 10 GHz with a bandwidth of 3 GHz (full frequency width at half of the peak response) has been achieved. Materials can find applications in suppression of electromagnetic interference (EMI), and reduction of radar signature.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
S.M. Abbas, A.K. Dixit, R. Chatterjee, T.C. Goel,