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

Kenji Sakai; Shinzo Yoshikado

doi:10.4028/0-87849-449-9.239

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

Kenji Sakai, Shinzo Yoshikado

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

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.

Original language	English
Pages (from-to)	239-242
Number of pages	4
Journal	Key Engineering Materials
Volume	350
DOIs	https://doi.org/10.4028/0-87849-449-9.239
Publication status	Published - Jan 1 2007
Externally published	Yes

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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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.",

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AU - Sakai, Kenji

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N2 - 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.

AB - 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.

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KW - Permalloy

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

Abstract

Keywords

ASJC Scopus subject areas

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