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

TitleFlexible microwave absorbers based on barium hexaferrite, carbon black, and nitrile rubber for 2-12 GHz applications
Publication TypeJournal Article
Year of Publication2014
AuthorsVinayasree, S, Soloman, MA, Sunny, V, Mohanan, P, Kurian, P, Joy, PAlias, Anantharaman, MR
JournalJournal of Applied Physics
Volume116
Issue2
Pagination024902
Date PublishedJUL
ISSN0021-8979
Abstract

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, C, and X-bands employing a model in which an electromagnetic wave is incident normally on a metal terminated single layer. Reflection loss exceeding -20 dB is obtained for all the samples in a wide frequency range of 2-12 GHz when an appropriate absorber thickness between 5 and 9 mm 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. (C) 2014 AIP Publishing LLC.

DOI10.1063/1.4886382
Type of Journal (Indian or Foreign)Foreign
Impact Factor (IF)2.32
Divison category: 
Physical and Materials Chemistry