Effect of Sendust Particle Size on Absorption Characteristics of Composite Electromagnetic Wave Absorber

Kenji Sakai; Yoichi Wada; Yuuki Sato; Shinzo Yoshikado

doi:10.4028/www.scientific.net/KEM.421-422.451

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Nanocomposite SPEEK/Titania Nanosheets (TNS) Proton Exchange Membranes for Fuel Cell Applications
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Effect of Sendust Particle Size on Absorption Characteristics of Composite Electromagnetic Wave Absorber
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Effect of Sendust Particle Size on Absorption Characteristics of Composite Electromagnetic Wave Absorber

Abstract:

The effects of the particle size of sendust, which is an alloy of Al 5%, Si 10%, and Fe 85%, on the absorption characteristics of composite electromagnetic wave absorbers made of polystyrene resin and sendust were investigated in the frequency range from 1 to 40 GHz. The size of sendust particles was varied between approximately 5 and 20 m. A metal-backed single-layer absorber made of 20 m sendust particles absorbed more than 99% of electromagnetic wave power at frequencies above 20 GHz. Meanwhile, a composite made of 5 m particles exhibited a return loss of less than −20 dB in the frequency range of not only several GHz but also above 30 GHz. In addition, the relative complex permeability r* was shown to be controlled by adjusting the particle size of sendust, and an electromagnetic wave absorber with a flexible design was proposed.