Flexible microwave absorbers based on barium hexaferrite, carbon black, and nitrile rubber for 2-12GHz applications

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[1] [1,Vinayasree, S.
[2] Soloman, M.A.
[3] Sunny, Vijutha
[4] Mohanan, P.
[5] Kurian, Philip
[6] Joy, P.A.
[7] Anantharaman, M.R.
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Anantharaman, M.R. (mraiyer@yahoo.com) | 1600年 / American Institute of Physics Inc.卷 / 116期
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Flexile single layer electromagnetic wave absorbers were designed by incorporating appropriate amounts of carbon black in a nitrile butadiene rubber matrix along with an optimized amount of magnetic counterpart; namely; barium hexaferrite for applications in S; C; and X-bands. Effective dielectric permittivity and magnetic permeability were measured using cavity perturbation method in the frequency range of 2-12 GHz. The microwave absorbing characteristics of the composites were studied in the S; and X-bands employing a model in which an electromagnetic wave is incident normally on a metal terminated single layer. Reflection loss exceeding -20dB is obtained for all the samples in a wide frequency range of 2-12 GHz when an appropriate absorber thickness between 5 and 9mm is chosen. The impact of carbon black is clearly observed in the optimized composites on the mechanical strength; thickness; band width of absorption; dielectric properties; and absorptivity. © 2014 AIP Publishing LLC;
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