The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 25, 2003
Filed:
Dec. 14, 2001
Sergiu Radu, Fremont, CA (US);
Russel K. Brovald, Mountain View, CA (US);
Randall C. Luckenbihl, Pleasanton, CA (US);
Sun Microsystems, Inc., Palo Alto, CA (US);
Abstract
A method and apparatus for reducing electromagnetic radiation emanating from a computer enclosure are disclosed, for application to computer enclosure enclosing at least one source of electromagnetic radiation of a computer system, where the enclosure includes an unshielded opening in the computer enclosure through which an undesirable amount of electromagnetic radiation from the source is capable of passing to an exterior of the computer enclosure. The apparatus includes a system board mounted to a frame of the computer enclosure, and a riser card connected to the system board within the computer enclosure. The riser card is a PCB having at least one ground layer and a signal layer, and extends transversely from the system board. The riser card divides an interior space of the computer enclosure into two compartments, a source compartment containing the source of electromagnetic radiation, and an unshielded compartment having the unshielded opening in it. The ground layer of the riser card is positioned towards a side of the riser card facing the unshielded compartment. The apparatus further includes a sheet metal barrier attached to the frame of the computer enclosure and around a perimeter of the ground layer. The riser card and the sheet metal barrier together form an EMI shield between the source compartment and the unshielded compartment, whereby the undesirable amount of electromagnetic radiation from the source is prevented from passing to an exterior of the computer enclosure.