Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8153110 | Journal of Magnetism and Magnetic Materials | 2018 | 23 Pages |
Abstract
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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Pawandeep Kaur, Shalini Bahel, S. Bindra Narang,