Radio frequency absorbing shield and method
First Claim
Patent Images
1. A method for preparing a plastic containing insulating metal powder particles, said method comprising steps of:
- placing the metal powder particles in a mixing container;
adding a solution comprising a monomer dissolved in a solvent to the metal powder particles to form a mixture;
stirring the mixture to provide an even consistency;
baking the mixture to remove solvents;
stirring the mixture to break the surface of the mixture;
polymerizing the monomer;
grinding the mixture to form a powder; and
including the powder in a plastic matrix.
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Abstract
A method for insulating metal powder particles comprises steps of placing the metal powder particles in a mixing container and adding a monomer in solution to the metal powder particles to form a mixture. The mixture is then stirred to provide an even consistency and is baked to remove solvents. The mixture is then stirred and the monomer is polymerized by exposing the monomer coated carbonyl iron particles to moist gas. The mixture is then ground to form a powder. The powder is suitable for incorporation into plastic resins for subsequent casting to form radio frequency shields having high DC resistance.
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Citations
20 Claims
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1. A method for preparing a plastic containing insulating metal powder particles, said method comprising steps of:
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placing the metal powder particles in a mixing container; adding a solution comprising a monomer dissolved in a solvent to the metal powder particles to form a mixture; stirring the mixture to provide an even consistency; baking the mixture to remove solvents; stirring the mixture to break the surface of the mixture; polymerizing the monomer; grinding the mixture to form a powder; and including the powder in a plastic matrix. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for radio frequency shielding comprising an insulating molded plastic, said molded plastic including in combination:
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a resin; and insulated metallic particles. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. In a communications apparatus comprising a receiving antenna, a transmitting antenna and a shield separating said receiving antenna from electromagnetic energy radiated from said transmitting antenna, said shield comprising:
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insulated metal particles, wherein said insulated metal particles include an insulating coating; and a plastic matrix including said insulated metal particles. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification