Evaluation of composite electromagnetic wave absorber made of polystyrene resin and permalloy or sendust

Kenji Sakai, Shinzo Yoshikado

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The frequency dependences of the complex permeability μr*, complex permittivity εr*, 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 μr* increased with increasing mixture ratio of magnetic materials. The frequency dependence of μr* 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.

Original languageEnglish
Pages (from-to)239-242
Number of pages4
JournalKey Engineering Materials
Volume350
DOIs
Publication statusPublished - Jan 1 2007
Externally publishedYes

Keywords

  • Complex permeability
  • Composite electromagnetic wave absorbers
  • Permalloy
  • Polystyrene resin
  • Sendust

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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