Electromagnetic Characterization of Co-Ti-Doped Ba-M Ferrite-Based Frequency-Tunable Microwave Absorber in 12.4–40 GHz

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• 作者：Sukhleen Bindra Narang ; Kunal Pubby
• 关键词：Barium hexaferrite ; K band ; Ka band ; Electromagnetic properties ; Absorption ; Attenuation constant
• 刊名：Journal of Superconductivity and Novel Magnetism
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：30
• 期：2
• 页码：511-520
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Strongly Correlated Systems, Superconductivity; Magnetism, Magnetic Materials; Condensed Matter Physics; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1557-1947
• 卷排序：30

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.