ELECTROMAGNETIC FIELD ABSORBING COMPOSITION
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United States of America Patent
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Sep 1, 2016
app pub date -
Oct 8, 2014
filing date -
Oct 11, 2013
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Abstract
An electromagnetic radiation absorbing composition is described, comprising a magnetic filler material taking the form of a metallic flake, and a non-conductive binder, wherein the magnetic filler is present in the range of from 1 to 5 volume % of dried volume. The use of a magnetic filler material according to embodiments of the invention is able to provide relatively narrow-band attenuation spectra with good repeatability. The strong coupling that can be achieved between flakes in a flaked filler give desirable polarisation and magnetic properties, while maintaining a relatively low filling fraction. Embodiments may incorporate a flake comprising a permalloy, and of an average size in the range 1 to 100 microns.
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