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Microwave Absorbing Properties of Fe-Si-Al Alloy Flaky Powder-Rubber Composites  

Lee Kyung-Sub (R&D Center, Chang Sung Corporation)
Yoon Yeo-Choon (R&D Center, Chang Sung Corporation)
Choi Gwang-Bo (R&D Center, Chang Sung Corporation)
Kim Sung-Soo (Department of Material Engineering, Chungbuk University)
Lee Jun-Young (School of Applied Chemistry and Chemical Engineering, Sung Kyun Kwan University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.16, no.2, 2005 , pp. 228-234 More about this Journal
Abstract
A magnetic composite as noise absorber of quasi-microwave band was developed. The Fe-Si-Al alloy powder were forged by attrition mill to get flaky shape. The magnetic composite sheet was fabricated in which powders are dispersed in polymer and aligned in the direction perpendicular to electromagnetic wave propagation. The permittivity of magnetic composite is increased as forging time increasing, while the permeability is decreased slightly. The maximum attenuation peak of reflection loss is shifted to lower fiequency range as milling time increasing, and the value of maximum attenuation peak is to get smaller gradually. From these result, we could designed a noise absorber sheet (t=1.0 mm) for quasi-microwave band, which is impedance matched at 1.4 GHz with respect to -8.2 dB reflection 1055.
Keywords
Microwave Absorber; Magnetic Composite; Material Characteristics; Reflection Loss;
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