Complex permeability and permittivity variation of radar absorbing materials based on MnZn ferrite in microwave frequencies
AUTOR(ES)
Gama, Adriana Medeiros, Rezende, Mirabel Cerqueira
FONTE
Mat. Res.
DATA DE PUBLICAÇÃO
21/05/2013
RESUMO
The complex dielectric permittivity (ε) and magnetic permeability (µ) of Radar Absorbing Materials (RAM) based on magnetic particles (MnZn ferrite particles) embedded in a dielectric matrix (silicon rubber) have been studied in the frequency range of 2 to 18 GHz. The relative permeability and permittivity of MnZn ferrite-silicon composites for various mass fractions are measured by the transmission/reflection method using a vector network analyzer. The concentration dependence of permittivity and permeability on the evaluated frequency range is analyzed. In a general way, the results show ε' parameter presenting more significant variation among the evaluated parameters (ε", µ", µ'). The comparison of dielectric and magnetic loss tangents (ε"/ε' and µ"/µ', respectively) shows more clearly the variation of both parameters (ε and µ) according to the frequency. It is also observed that higher MnZn ferrite content fractions favor both dielectric and magnetic loss tangents.
Documentos Relacionados
- Reflectivity of Hybrid Microwave Absorbers Based on NiZn Ferrite and Carbon Black
- A microwave method for complex permittivity extraction of thin materials
- Radar absorbing materials based on titanium thin film obtained by sputtering technique
- Nanostructured composites based on carbon nanotubes and epoxy resin for use as radar absorbing materials
- Síntese e caracterização da ferrita de MnZn obtida pelo método dos citratos precursores