Improvement of Electromagnetic Wave Absorption Ability by Reducing Impedance Oscillation Characteristics
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概要
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Improvement of the electromagnetic wave absorption ability was examined from the electromagnetic point of view. The oscillation behavior in relation to incident impedance derived from a hyperbolic tangent function can be reduced by increasing the imaginary part, i.e., loss value, of permeability and/or permittivity owing to its mathematical characteristics. It was demonstrated that the electromagnetic wave absorption ability was obviously enhanced by inserting the lossy magnetic layer between the electromagnetic wave absorber and a reflector. The absorption ability was improved further by pilling the polyurethane foam plate having lower permittivity to provide -9.6 dB (ca. 89% absorption) for the frequency range above 0.75 GHz with a total absorber thickness of 15.15 mm.
- 2012-01-25
著者
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Machida Ken-ichi
Department Of Applied Chemistry Faculty Of Engineering Osaka University
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Itoh Masahiro
Department Of Anatomy Tokyo Medical University
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Sasada Masaaki
EM-Techno Co., Ltd., Toyonaka, Osaka 561-0827, Japan
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Terada Masao
Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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Machida Ken-ichi
Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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Itoh Masahiro
Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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