Physics – Condensed Matter – Materials Science
Scientific paper
2011-05-30
JMMM Volume 323, Issue 22, November 2011, Pages 2782-2785
Physics
Condensed Matter
Materials Science
9 pages, 6 figures; accepted for the Journal of Magnetism and Magnetic Materials
Scientific paper
10.1016/j.jmmm.2011.05.052
We report the analysis of measurements of the complex magnetic permeability ($\mu_r$) and dielectric permittivity ($\epsilon_r$) spectra of a rubber radar absorbing material (RAM) with various MnZn ferrite volume fractions. The transmission/reflection measurements were carried out in a vector network analyzer. Optimum conditions for the maximum microwave absorption were determined by substituting the complex permeability and permittivity in the impedance matching equation. Both the MnZn ferrite content and the RAM thickness effects on the microwave absorption properties, in the frequency range of 2 to 18 GHz, were evaluated. The results show that the complex permeability and permittivity spectra of the RAM increase directly with the ferrite volume fraction. Reflection loss calculations by the impedance matching degree (reflection coefficient) show the dependence of this parameter on both thickness and composition of RAM.
Dantas Christine C.
Gama Adriana M.
Rezende Mirabel C.
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