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US 12,628,321 B2Granted
Electromagnetic absorbing composites
Assignee3M Innovative Properties Company
InventorsAdam D. Miller, Dipankar Ghosh
Life of this patent
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Abstract
A composite comprising a polymeric matrix and EM absorbers dispersed within the polymeric matrix. Each EM absorber comprises a ceramic particle having a surface, and a magnetic coating on at least a portion of the surface of the ceramic particle. The EM absorbers function as dielectric and magnetic absorbers in the 1-100 GHz frequency range. The composite can be used as an electromagnetic shielding article to mitigate electromagnetic interference in, for example, high speed, high frequency (HSHF) consumer electronics.
Claims18
A composite comprising:
- a polymeric matrix;
- and
- EM absorbers dispersed within the polymeric matrix, each EM absorber comprising a ceramic particle having a spherical surface and an average particle diameter ranging from 0.1 μm to 50 μm, and a magnetic coating on at least a portion of the spherical surface of the ceramic particle,
- wherein the ceramic particle comprises copper(II) oxide, a metal nitride, a metal carbide, a metal sulfide, a metal silicide, a metal boride, a multiferroic compound, or combinations thereof, and
- wherein the EM absorbers function as dielectric and magnetic absorbers in the 1-100 GHz frequency range.
2 more elements
Dependencies are inferred from the claim text.