Polymer composites with electromagnetic interference mitigation properties

Abstract

Polymer composites that are suitable for use as electromagnetic interference mitigaters include a lossy polymeric matrix, ceramic particles dispersed within the polymeric matrix, and conductive particles dispersed within the polymeric matrix. The lossy polymeric matrix may be a fluorocarbon-based polymer matrix, or an epoxy-based polymer matrix. The ceramic particles may be metal oxide particles, especially copper oxide (CuO) particles. The conductive particles may be carbon black. Other electromagnetic interference mitigating polymer matrices include a lossy polymeric matrix and copper oxide (CuO) particles dispersed within the polymeric matrix.

What is claimed is: 
     
         1 . A composite for mitigating electromagnetic interference, comprising:
 a lossy polymeric matrix having a dielectric loss tangent of from 0.005 to 0.50; and   a mixture of ceramic particles and conductive particles dispersed within the polymeric matrix, the ceramic particles comprising copper oxide (CuO) particles; wherein:   the lossy polymeric matrix comprises epoxy-based polymeric matrix, and the conductive particles comprise carbon black; or   the lossy polymeric matrix is selected from the group consisting of epoxy-based polymeric matrix prepared from one or more bisphenol-A-based epoxy resins, one or more bisphenol-F-based epoxy resins, one or more phenol novolac-based epoxy resins, or a combination thereof.   
     
     
         2 . The composite of  claim 1 , wherein the composite mitigates electromagnetic interference in the 100 MegaHertz-100 GigaHertz range. 
     
     
         3 . The composite of  claim 1 , wherein the composite mitigates electromagnetic interference in the 1-20 GigaHertz range. 
     
     
         4 . The composite of  claim 1 , wherein the dielectric loss tangent of the lossy polymeric matrix is from 0.01 to 0.30. 
     
     
         5 . A composite for mitigating electromagnetic interference, comprising:
 a lossy polymeric matrix; and   copper oxide (CuO) particles dispersed within the polymeric matrix, wherein the lossy polymeric matrix is selected from the group consisting of an epoxy-based polymeric matrix prepared from one or more bisphenol-A-based epoxy resins, one or more bisphenol-F-based epoxy resins, one or more phenol novolac-based epoxy resins, or a combination thereof.   
     
     
         6 . The composite of  claim 5 , wherein the composite mitigates electromagnetic interference in the 100 MegaHertz-100 GigaHertz range. 
     
     
         7 . The composite of  claim 5 , wherein the composite mitigates electromagnetic interference in the 1-20 GigaHertz range. 
     
     
         8 . The composite of  claim 5 , wherein the lossy polymeric matrix has a dielectric loss tangent of from 0.005 to 0.50. 
     
     
         9 . The composite of  claim 5 , wherein the lossy polymeric matrix has a dielectric loss tangent of from 0.01 to 0.30.