Anantharaman, M R; Vinayasree, S; Soloman, M A; Vijutha, Sunny; Mohanan, P; Philip, Kurian(Elsevier, April 21, 2013)
[+]
[-]
Abstract:
Flexible and thin single layer microwave absorbers based on strontium ferrite–carbon black–nitrile rubber
composites have been fabricated employing a specific recipe and their reflection loss characteristics
were studied in the S (2–4 GHz) and X-bands (8–12 GHz). The incorporation of carbon black not only
reinforces the rubber by improving the mechanical properties of the composite but also modifies the
dielectric permittivity of the composite. Strontium ferrite when impregnated into a rubber matrix
imparts the required magnetic permeability to the composite. The combination of strontium ferrite
and carbon black can then be employed to tune the microwave absorption characteristics of the resulting
composite. The complex dielectric permittivity and permeability were measured by employing a cavity
perturbation technique. The microwave absorption characteristics of composites were modelled in that
an electromagnetic wave incident normally on the metal terminated single layer absorber. The influence
of filler volume fraction, frequency, absorber thickness on the bandwidth of absorption are discussed and
correlated