Wideband and Narrowband Microwave Characteristics of Co/Ti-Substituted M-Type Ca-Hexagonal Ferrite
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- 作者：Charanjeet Singh ; S. Bindra Narang
- 关键词：Ferrites ; microwave shielding effectiveness ; microwave absorption
- 刊名：Journal of Electronic Materials
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：46
- 期：2
- 页码：866-871
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials; Electronics and Microelectronics, Instrumentation; Solid State Physics;
- 出版者：Springer US
- ISSN：1543-186X
- 卷排序：46
文摘
Polycrystalline M-type CaCoxTixFe(12−2x)O19 (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) hexagonal ferrite compositions, with substitution of Co2+ and Ti4+ ions, have been synthesized by a two-route ceramic method. Vector network analysis was used to measure various microwave and electromagnetic parameters from 8.2 GHz to 12.4 GHz. The microwave shielding effectiveness (SE) due to absorption (SEA) and reflection (SER) was investigated based on S-parameters for the near field, and intrinsic parameters, accompanied by AC conductivity and skin depth, for the far field. The shielding effectiveness was primarily governed by absorption (SEA), and substitution of Co2+ and Ti4+ ions resulted in near- and far-field SEA of 54.85 dB at 10.49 GHz and 63.43 dB at 1.15 (Ω m)−0.5, respectively, for the composition with x = 0.6. The AC conductivity exhibited a monotonic increase with frequency, whereas the skin depth decreased with frequency for all the compositions. The composition with x = 0.6 exhibited a 20-dB wide absorption bandwidth (WAB) of 3.67 GHz and 3.66 GHz for near and far field, respectively. The composition with x = 0.3 showed a 10-dB narrow absorption bandwidth (NAB) of 80 MHz for the far field.