Low cost electromagnetic energy absorbers manufactured from...

Communications: directive radio wave systems and devices (e.g. – Radio wave absorber – With particular geometric configuration

Reexamination Certificate

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C428S034900, C428S313500

Reexamination Certificate

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07136008

ABSTRACT:
Electromagnetic energy absorbing devices are formed of a conductive loaded resin-based material. The conductive loaded resin-based material comprises micron conductive powder(s), conductive fiber(s), or a combination of conductive powder and conductive fibers in a base resin host. The ratio of the weight of the conductive powder(s), conductive fiber(s), or a combination of conductive powder and conductive fibers to the weight of the base resin host is between about 0.20 and 0.40. The micron conductive powders are formed from non-metals, such as carbon, graphite, that may also be metallic plated, or the like, or from metals such as stainless steel, nickel, copper, silver, that may also be metallic plated, or the like, or from a combination of non-metal, plated, or in combination with, metal powders. The micron conductor fibers preferably are of nickel plated carbon fiber, stainless steel fiber, copper fiber, silver fiber, or the like.

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Co-pending U.S. Patent, filed Dec. 4, 2002, U.S. Appl. No. 10/309,429, “Low Cost Antennas Using Conductive Plastics or Conductive Composites,” assigned to the same assignee.

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