home > EMI shielding material
EMI Theory
Electronic devices operating normally in their intended environment, without conducting or radiating excessive amounts of electromagnetic energy, or being susceptible to such energy from internal or external sources, are in the state of electromagnetic compatibility, or EMC. Electromagnetic interference, EMI, is radiated or conducted energy that adversely affects circuit performance, and thus disrupts a device’s EMC. Many types of electronic circuits radiate or are susceptible to EMI and must be shielded to ensure proper performance. Establishing basic electromagnetic compatibility in any electronic device generally requires two distinct approaches. The first approach is to reduce EMI generated from internal sources. It is the best accomplished by designing an electronic circuit or device so that it inherently generates less EMI. Residual EMI may then be suppressed or contained within the enclosure by appropriate filtering and shielding methods. Filtering cables at the point where they enter or leave the enclosure will reduce conducted emissions. Radiated EMI may be eliminated or reduced by the use of shielded enclosures and shielding materials. The second method for establishing EMC in a device is to improve its immunity (or reduce its susceptibility) to interference from external EMI sources.
Here you will find everything you need, to solve all your EMI shielding issues. Products including: 1. EMI Shielding gasket (Conductive fabric over foam, Conductive elastomer, BeCu Strips), 2. EMI shielding/conductive tape (Copper foil tape, Aluminum foil tape, conductive fabric tape), 3. EMI shielding adhesive (Conductive adhesive). Our technical engineers will work together with you from the design phase through final production.
Here you will find everything you need, to solve all your EMI shielding issues. Products including: 1. EMI Shielding gasket (Conductive fabric over foam, Conductive elastomer, BeCu Strips), 2. EMI shielding/conductive tape (Copper foil tape, Aluminum foil tape, conductive fabric tape), 3. EMI shielding adhesive (Conductive adhesive). Our technical engineers will work together with you from the design phase through final production.
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:
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.
EMI shielding material：EMI gaskets shielding、EMI gasket、fabric tape、aluminum foil tape、copper foil tape
EMI gaskets shielding
EMI gaskets shielding are used to provide an electrically conductive seal for electronic equipment openings and housing covers to prevent or restrict electromagnetic interference. EMI Gaskets have good performance after strictly testing. It is an efficient way using our gaskets and fabric tapes into any electronics to avoid the electromagnetic interference. EMI gasket
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:Fabric tape
Fabric tape/Electrically-Conductive Adhesive Transfer Tapes are designed to help you save time in a variety of specialized electronics assembly operations – from attaching EMI shields and gaskets to grounding and bonding flexible circuits and PCBs – while improving the performance and reliability of your finished products.Aluminum foil tape
Aluminum Foil Tapes are an economical EMI shielding solution for a variety of commercial uses. The tapes are available in copper, aluminum, or tinned copper foil backed with QuanYi’s highly conductive pressure-sensitive adhesive. Standard length rolls and die-cut custom shapes can be ordered.Copper foil tape
Copper Foil Tapes are an economical EMI shielding solution for a variety of commercial uses. The tapes are available in copper, aluminum, or tinned copper foil backed with our highly conductive pressure-sensitive adhesive. Standard length rolls and die-cut custom shapes can be ordered. Copper foil tapes are recommended for electro-static shielding, cable wrapping, and stained glass work.