r' region. The frequency characteristics of the conventional ferrite-rubber EM absorber can be improved by combining with the negative permittivity property of the MFA composite. A frequency selective shielding can be achieved by the evanescent EM wave propagation in the layered MFA composite structure." />


An EM Absorber and Frequency Selective Shielding by Use of Metal Fiber Array Composites

Takanori TSUTAOKA  Kenichi HATAKEYAMA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E93-B   No.7   pp.1858-1861
Publication Date: 2010/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.1858
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Section on Advanced Electromagnetic Compatibility Technology in Conjunction with Main Topics of EMC'09/Kyoto)
Category: 
Keyword: 
metal fiber array composite,  negative permittivity,  EM absorber,  frequency selective shielding,  

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Summary: 
The construction of EM absorber and frequency selective shielding has been investigated by using two dimensional metal fiber array (MFA) composites. The MFA composite shows a resonant type frequency dispersion in the complex relative permittivity spectra (εr = εr' - jεr") having a negative εr' region. The frequency characteristics of the conventional ferrite-rubber EM absorber can be improved by combining with the negative permittivity property of the MFA composite. A frequency selective shielding can be achieved by the evanescent EM wave propagation in the layered MFA composite structure.