Design of Composite Electromagnetic Wave Absorber Made of Soft Magnetic Materials Dispersed and Isolated in Polystyrene Resin

Abstract:

Composite electromagnetic wave absorbers made of a soft magnetic material (permalloy or sendust) and polystyrene resin were investigated [1]. The volume mixture ratio of magnetic material was varied in the range from 18 vol% to 75 vol%. The composites with the low volume mixture ratio of soft magnetic material absorbed more than 99 % of electromagnetic wave power in the frequency range from 1 GHz to 10 GHz. The values of the real part
r’ of the relative complex permeability
r * for both magnetic materials were less than unity at frequencies above approximately 6 GHz as the volume mixture ratio of magnetic material increased. This result suggests the possible realization of an electromagnetic wave absorber that can operate above 10 GHz.

• Periodical: Key Engineering Materials (Volume 388)
• Pages: 257-260
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.388.257
• Online since: September 2008
• Authors: Kenji Sakai, Yoichi Wada, Shinzo Yoshikado
• Keywords: Complex Permeability, Composite Electromagnetic Wave Absorber, Permalloy, Polystyrene Resin, Sendust

References

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