Composite electromagnetic wave absorber made of soft magnetic material and polystyrene resin and control of permeability and permittivity

Kenji Sakai, Norizumi Asano, Yoichi Wada, Shinzo Yoshikado

Research output: Contribution to journalArticle

18 Citations (Scopus)


The frequency dependences of the relative complex permeability μr *, the relative complex permittivity ε{lunate}r * and the absorption characteristics for composite electromagnetic wave absorbers made of polystyrene resin and sendust particles or permalloy particles were investigated in the frequency range from 1 to 40 GHz. The size of sendust particles was varied between approximately 5 and 20 μm and the particle size dependence of μr * was observed. The value of μr * was shown to be controlled by adjusting the particle size of sendust, and an electromagnetic wave absorber with a flexible design was proposed. A metal-backed single-layer absorber made of sendust particles or permalloy particles absorbed more than 99% of electromagnetic wave power at frequencies above 20 GHz. In addition, a composite made of 5 μm particles exhibited a return loss of less than -20 dB in the frequency range of not only several GHz but also above 30 GHz.

Original languageEnglish
Pages (from-to)347-353
Number of pages7
JournalJournal of the European Ceramic Society
Issue number2
Publication statusPublished - Jan 2010
Externally publishedYes



  • Composites
  • Electromagnetic wave absorber
  • Hot pressing
  • Magnetic properties
  • Soft magnets

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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