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Method of reducing EMC emissions using combination of absorber and gasket materials.

IP.com Disclosure Number: IPCOM000198616D
Publication Date: 2010-Aug-10
Document File: 2 page(s) / 20K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for utilizing a combination of electromagnetic interference (EMI) absorption material and conductive gaskets to further reduce radiated emissions. Using this combination allows for better EMC performance over a larger range of frequencies and provides a higher level of attenuation.

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Method of reducing EMC emissions using combination of absorber and gasket materials.

The use of hot-swap modules in server enclosures requires some method of reducing or eliminating gaps around the perimeter of the modules which allow radiated electromagnetic compatibility (EMC) emissions (also known as noise) to escape from the main enclosure, which acts as a faraday cage. This is typically accomplished through the use of conductive fabric over foam gaskets or metal springs between the module and enclosure. The amount of noise attenuation obtained through these typical methods is limited and can vary depending on a number of factors such as gasket compression/contact force, surface contamination/oxidation, and frequency of the noise source. As data transfer speeds increase and allowable radiated emissions stay level or even decrease, the need for additional methods of attenuation becomes apparent.

The method disclosed here utilizes a combination of electromagnetic interference (EMI) absorption material and conductive gaskets to further reduce radiated emissions. Using this combination allows for better EMC performance over a larger range of frequencies and provides a higher level of attenuation.

This concept is associated with electronic computing devices that, as result of their operations, internally generate electromagnetic noise. This noise has to be contained within the device but in general, government agencies realize that a portion of such noise will leak out from the intentional and non-intentional gaps of the main enclosure. The total allowed amount of the radio frequency (RF) leakage at different points in the electromagnetic spectrum is well defined and regulated.

In order to meet such regulations or lower the amount of EMI, certain techniques have been used in the past. For example,...