کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8153110 | 1524761 | 2018 | 23 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Broad-band microwave absorption of Sr0.85La0.15(MnZr)xFe12-2xO19 hexagonal ferrite in 18-40â¯GHz frequency range
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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
In this research, electro-magnetic (EM) absorption was investigated for M-type strontium hexaferrite with chemical composition, Sr0.85La0.15(MnZr)xFe12-2xO19 (xâ¯=â¯0, 0.25, 0.50, 0.75, 1.0) at microwave frequencies. Complex permittivity (Éâ²-jÉâ²â²) and complex permeability (µⲠ- jµâ²â²) was measured using transmission and reflection (T/R) based waveguide method in the K-band (18-26.5â¯GHz) and Ka-band (26.5-40â¯GHz) frequency range. The variation of reflection loss (RL) with sample thickness, frequency and substitution has been analyzed. The matching thickness of the synthesized ferrite was successfully predicted from quarter-wavelength (λ/4) mechanism which helps to optimize the minimum reflection loss (RL) in the material. In K-band, the minimum reflection loss (RL) of â47.8â¯dB was obtained for composition xâ¯=â¯1.0 with â10â¯dB (90%) bandwidth of 7.97â¯GHz and â20â¯dB (99%) bandwidth of 5.6â¯GHz at sample thickness 1.1â¯mm. In Ka-band, the maximum absorption with minimum RL of â29.9â¯dB with â10â¯dB bandwidth of 8.72â¯GHz was obtained for composition xâ¯=â¯0.50 at 0.85â¯mm sample thickness. These synthesized ferrites find application as thin sheet of microwave absorber with broad bandwidth for EMI (electromagnetic interference) shielding and radar camouflaging.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 460, 15 August 2018, Pages 489-494
Journal: Journal of Magnetism and Magnetic Materials - Volume 460, 15 August 2018, Pages 489-494
نویسندگان
Pawandeep Kaur, Shalini Bahel, S. Bindra Narang,