کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8154903 | 1524802 | 2016 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
X-band microwave absorbing characteristics of multicomponent composites with magnetodielectric fillers
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We have studied the microwave absorbing performance in the X-band (8-12.4Â GHz) of epoxy composites filled with magnetic and dielectric oxides and multiwalled carbon nanotubes. To this end, pure cobalt-substituted Ba-hexaferrite and calcium titanate were synthesized with the hydrothermal method in the form of nanosized powder. Moreover, the produced powders were characterized in regard of their structural, morphological and static magnetic properties. For the electromagnetic investigation, composite samples were also prepared with various thicknesses up to 4Â mm and two basic filler compositions; namely 30Â wt% of BaCoFe11O19 and 30Â wt% of the mixture BaCoFe11O19/CaTiO3/carbon nanotubes. The magnetic composites show strong but narrowband reflection losses up to 27.5Â dB, whereas the magnetodielectric composites with maximum losses of 15.8Â dB possess wider bandwidth of operation, due to improved impedance matching. Furthermore, the characteristic frequency of the maximum losses for these quarter-wavelength absorbers was verified to be in inverse proportion to the layer thickness. These findings are supported by reflectance measurements of the samples both in waveguide and free-space.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 419, 1 December 2016, Pages 386-393
Journal: Journal of Magnetism and Magnetic Materials - Volume 419, 1 December 2016, Pages 386-393
نویسندگان
Seyyed Salman Seyyed Afghahi, Mojtaba Jafarian, Charalampos A. Stergiou,