EMI Introduction

A knowledge of the fundamental concepts of EMI will aid the designer in selecting the gasket inherently best suited to a specific design.
To choose a most effective EMI shielding gasket for products such as telecommunications equipment, handset device, laptop PC, PC related, automotive and medical electronics, often you have three options: conductive fabric over foam (Aluminum foil over foam), conductive elastomer, or beryllium-copper (BeCu) strips (fingerstock). Depending on the product’s needs, these solutions provide varying EMI protection, intricacy of forms, and environmental protection.


As designing EMI shielding into products, some factors must be considered:

* Attenuation level. Most commercial applications typically require 60 to 100 dB but can go as high as 120 dB.
1. EMI Gasket of Conductive fabric over foam -Typical EMI shielding effectiveness is around 80 to 115 dB.( 10kHz to 10GHz frequency range)
2. EMI Gasket of Conductive elastomers - Typical EMI shielding effectiveness is around 40 to 120 dB.( 10kHz to 10GHz frequency range)
3. EMI Gasket of BeCu Strips (Fingerstock) - Typical EMI shielding effectiveness is around 75 to 120 dB.( 10kHz to 10GHz frequency range)
* Compression. Most commercial applications require low closure force. Compression force has the greatest effect on conductive elastomer shielding characteristics. Since they can be loaded with relatively low- to high-conductivity filler materials, conductive elastomers supply the widest range of shielding effectiveness.
BeCu strips and conductive fabric-over-foam gaskets are not affected as much by compression forces. As a result, they offer a narrower range of shielding capabilities.
* Mechanical durability.
* Form, referring to the complexity of the form or pattern in which the gasket fits.
* Galvanic compatibility between the gasketing conductive material and substrate metal. This avoids creating a galvanic cell, which can lead to corrosion.
* Environmental sealing from water, dust, and similar external substances.

Other selection considerations include cost, service life (cycles, actuations), tolerances, and mounting methods such as fastener types and adhesives.


We can supply any quantity and any kind of Copper Beryllium Finger Strips and Industrial Enclosure Shielding from stock.would you please inform us how many you need and your target price, then we will confirm ASAP. We are sincerely hope to do business with you and establish long term business relationship with your respectable company.

Look forward to hearing from you soon.

Best regards,

Sam Xu
Contact me:
MSN: xubiao_1996@hotmail.com
GMAIL: samjiefu@gmail.com
SKPYE:jiefu1996


Beryllium Copper Finger Strips and Industrial Enclosure Shielding