Browse Prior Art Database

Enclosure Design with Embedded Electromagnetic Compatibility Skirt

IP.com Disclosure Number: IPCOM000111243D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Meyer, KW: AUTHOR [+5]

Abstract

Disclosed is a design characterized by a printed circuit card which is shielded for Electromagnetic Interference (EMI) on one or more sides by conductive metal surfaces and shielded on the remaining sides by a series of conductive metal apertures which form the remaining sides of the EMI enclosure.

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Enclosure Design with Embedded Electromagnetic Compatibility Skirt

      Disclosed is a design characterized by a printed circuit card
which is shielded for Electromagnetic Interference (EMI) on one or
more sides by conductive metal surfaces and shielded on the remaining
sides by a series of conductive metal apertures which form the
remaining sides of the EMI enclosure.

      In the Figure, one conductive aperture is formed by the
following conductive path.  The path goes down 'A' to the shield,
across the shield to 'B'.  From 'B', it travels through the printed
circuit card back to 'A'.  This path may be DC or AC coupled but must
provide good conductivity at the EMI frequencies of interest.  The
rectangular aperture thus formed greatly attenuates EMI signals that
would pass through the plane of the aperture.  A continuous series of
apertures is formed around the parameter of the package having the
conductive stack fasteners as common sides to the apertures.  These
apertures reject EMI while passing cooling air flow.