Metal filaments for electromagnetic interference shielding

Details Metal filaments for electromagnetic interference shielding Metal filaments for electromagnetic interference shielding

1994-09-30

1998-10-27

Ledynh, Bot L.

Electricity: conductors and insulators

Anti-inductive structures

Conductor transposition

428408, H05K 900

Patent

active

058279970

ABSTRACT:
A material including filaments, which include a metal and an essentially coaxial core, each filament having a diameter less than 6 .mu.m, each core being essentially carbon, displays high effectiveness for shielding electromagnetic interference (EMI) when dispersed in a matrix to form a composite material. This matrix is selected from the group consisting of polymers, ceramics and polymer-ceramic combinations. This metal is selected from the group consisting of nickel, copper, cobalt, silver, gold, tin, zinc, nickel-based alloys, copper-based alloys, cobalt-based alloys, silver-based alloys, gold-based alloys, tin-based alloys and zinc-based alloys. The incorporation of 7 percent volume of this material in a matrix that is incapable of EMI shielding results in a composite that is substantially equal to copper in EMI shielding effectiveness at 1-2 GHz.

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