Motorola Corporation

Robert D Fraser

Ronald Dee Fuller

Mark D Mosher

David M Workinger

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.

Radio frequency absorbing shield and method

An electrostatic RF absorbant circuit carrier assembly production method including the steps of forming a polymeric support structure having a base and surrounding walls which form an internal cavity from plastic, disposing a plurality of conductor paths within the cavity, forming a polymeric cover having wall members integrally fashioned into a surface thereof, for making contact with conductor paths within the cavity, depositing a layer of surface material on the cover and the cover wall members, said surface material comprising:

Method for making electrostatic RF absorbant circuit carrier assembly

An electrostatic RF absorbant circuit carrier assembly (200) is described as having a plastic support structure (100) which consists of an integrally fashioned base (180) and surrounding sidewalls (170) which together form an internal cavity (185). A plurality of conductor paths (125,165) are disposed within the cavity (185). The assembly (200) is completed by a polymeric cover (110) having a surface integrally fashioned to comprise wall members (145) for making contact with conductive paths (165) within the cavity (185). In order to facilitate RF isolation and electrostatic dissipation, the cover (110) is layered with a surface material comprising:

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Tempe, AZ, United States of America

Robert D Fraser