Evaluation of Composite Electromagnetic Wave Absorber made of Polystyrene Resin and Permalloy or Sendust

Kenji Sakai; Shinzo Yoshikado

doi:10.4028/www.scientific.net/KEM.350.239

Paper Titles

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Effect of SnO₂ Addition on Electrical Degradation of ZnO Varistors
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Evaluation of Laminated Thin-Film ZnO Varistor by PLD
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Magnetic and Dielectric Properties of a Metal/ Cr₂O₃/Cr₂O_3-x/Cr₂O₃/Semiconductor Capacitor Using Magneto-Electric Materials
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Material Design for High Strength NTC Thermistor Ceramics
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Cathodoluminescence of Single Phase ZnAl₂O₄ and Diffusion Layer Synthesized by Coupling of ZnO and α-Al₂O₃
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Evaluation of Composite Electromagnetic Wave Absorber made of Polystyrene Resin and Permalloy or Sendust
p.239

High Frequency Dielectric Permittivity Measurement of Dielectric Layer of MLCC Using Non-Contact Probe
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 350Evaluation of Composite Electromagnetic Wave...

Evaluation of Composite Electromagnetic Wave Absorber made of Polystyrene Resin and Permalloy or Sendust

Abstract:

The frequency dependences of the complex permeability μ r*, complex permittivity ε r*, and return loss were investigated for composite electromagnetic wave absorbers made of soft magnetic materials (permalloy or sendust) and polystyrene resin. For permalloy, two types of particle shape were used: grain-type or flake-type. The volume mixture ratio of magnetic materials was varied in the range from 40 % to 70 %. The values of the real part μ ’ and imaginary part μ ” of μ r * increased with increasing mixture ratio of magnetic materials. The frequency dependence of μ r * for flake-type permalloy composite was similar to that for sendust composite. All absorbers showed the absorption of electromagnetic waves in the frequency range above 1 GHz.