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:
Nov. 17, 1992
Filed:
Jun. 28, 1991
Alexander Metsler, Newton, MA (US);
Digital Equipment Corporation, Maynard, MA (US);
Abstract
An integrated electromagnetic and radio frequency interference (EMI/RFI) shielding apparatus contains EMI/RFI produced by a computer system. In particular the apparatus isolates input/output (I/O) connectors of the computer system from EMI/RFI produced by noisy components of the system. The shielding apparatus comprises a printed circuit board (PCB) partitioned into two electromagnetically isolated zones separated by a non-conducting void. Components that are EMI/RFI producers, such as the CPU and clock, are mounted in a first zone, and components which need to be isolated, such as input/output connectors are mounted in a second zone. The various conducting layers in the PCB are arranged and filtered to inhibit EMI/RFI propagation to the I/O connectors. Additionally, the I/O connectors are isolated from EMI/RFI by a secondary EMI/RFI shield.