Emi-shielding solutions for computer enclosures using combinations of two and three-dimensional shapes formed in sheet metal

Abstract

The present invention provides a configuration of a computer-chassis containment or other electromagnetic device method for manufacture in which a “one-hit” solution may be implemented to provide adequate electromagnetic interference shielding (EMC shielding) and is configured such that shielding gaskets, “spoons” or other excessive structures may be reduced or eliminated completely. Patterned sinusoidal “patterns” that are stamped, molded, cut, or extruded into one or more sides of a “box” provide sufficient EMI shielding, such that the need for gaskets is reduced or eliminated.

Description

REFERENCE TO PRIORITY DOCUMENTS[0001]The present application claims priority under 35 USC §120 to, and is a continuation-in-part of, co-pending U.S. application: Ser. No. 11 / 080,385, filed Mar. 15, 2005 and entitled Reduced cost and gasketting “one-hit” and other manufacturing EMI-shielding solutions for computer enclosures, which is incorporated by reference for all purposes.[0002]This application claims priority under 35 USC §119(e) to U.S. Provisional Patent Application Ser. No. 60 / 891,720 entitled Hybrid 2-D and 3-D Attenuation Shapes for Electronics Enclosures filed Feb. 27, 2007.BACKGROUND[0003]The following background section is, in part, reprinted from “Design Techniques for EMC—Part 4 Shielding” by Eur Ing Keith Armstrong, Cherry Clough Consultants, Associate of EMC-UK.[0004]A complete volumetric shield is often known as a “Faraday Cage”, although this can give the impression that a cage full of holes (like Mr Faraday's original) is acceptable, which it generally is not. Th...

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