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Preparation and evaluation of composite electromagnetic wave absorbers made of aluminum fine particles dispersed in polystyrene medium
Author(s) -
Asano Norizumi,
Wada Yoichi,
Sakai Kenji,
Yoshikado Shinzo
Publication year - 2010
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.10169
Subject(s) - polystyrene , materials science , composite number , composite material , diamagnetism , electromagnetic radiation , aluminium , permittivity , optics , magnetic field , dielectric , optoelectronics , polymer , physics , quantum mechanics
We developed composite electromagnetic wave absorbers consisting of dispersed aluminum fine particles in a polystyrene medium and evaluated their properties in order to realize single‐layer electromagnetic wave absorbers with good absorption in the gigahertz region. Polystyrene particles with two diameters (approximately 200 μm and 1 μm) and fine aluminum particles were mixed by mechanical milling. The mixture was heated above the melting point of polystyrene and then cooled naturally in air. The frequency characteristics of the complex relative permeability and the complex relative permittivity were calculated from the values of the scattering parameters of a coaxial line loaded with a sample of a toroidal‐core shape. Both the diamagnetism and the magnetic loss increased in proportion to the volume mixing ratios of aluminum particles up to approximately 34 vol for samples made of polystyrene particles with approximately 200 μm or 1μm diameter. The diamagnetism was almost frequency‐independent and the magnetic loss decreased with increasing frequency for all samples. These results were in agreement with qualitative theoretical prediction. © 2009 Wiley Periodicals, Inc. Electron Comm Jpn, 93(1): 30– 40, 2010; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/ecj.10169