文摘
The aim of the presented study is to characterize the electromagnetic and absorption properties of cobalt-titanium-substituted barium hexaferrites BaCo x Ti xFe 12−2xO19 (x = 0.0, 0.1, 0.3, 0.5, 0.7 and 0.9), synthesized by ceramic method, in 12.4–40 GHz frequency range. A vector network analyser was employed to investigate the complex permittivity and permeability. Doping of impurity ions has resulted in an increase in imaginary permittivity and permeability. Conductivity analysis has been done to understand its influence over the absorption properties. Reflection loss and transmission loss values have been determined experimentally on the ferrite pellets, and percentage absorption was calculated theoretically. Absorption analysis shows that all ferrites are observed to have 60 to 76 % average absorption in this frequency range. Samples x = 0.3 and x = 0.7 have achieved absorption peaks of 97.37 and 90.45 %, respectively, at 36.22 GHz frequency. A.C. conductivity, impedance and attenuation constant calculations have been made in order to support the observed trends in the studied properties. The entire absorption analysis of these ferrites suggests their application as a single-layer absorber in reducing the electromagnetic pollution and shaping of antenna patterns.