RFI and EMI - Shielding and Absorbing Materials

Electromagnetic interference (EMI) and radio frequency interference (RFI) are two different types of electronic noise that can disrupt and/or degrade the performance of sensitive electronic equipment. EMI is usually caused by higher frequency electromagnetic fields, while RFI most often results from lower frequency electromagnetic fields. To prevent or limit the interference generated by these electromagnetic fields, shielding and absorbing materials are often used.

Types of Shielding and Absorbing Materials

There are a variety of shielding and absorbing materials that can be used to effectively attenuate EMI and RFI radiation. Common types of shielding and absorbing materials include:

• Conductive Foam
• Conductive Fabric
• Coiled Copper Wire
• Aluminum Foil
• Metalized Plastic Film
• Metal Mesh

Additionally, a wide range of radio frequency absorbing materials can be used to reduce the amount of interference generated by electromagnetic fields, including ferrite, carbon loaded foam, and various types of ferrite absorbers.

98100327 Application Field & Working Principle

98100327 is a type of shielding and absorbing material specifically designed for attenuating EMI and RFI. The material is made from a copper-nickel composite with a nickel-graphite shielding layer sandwiched between two copper layers. This composition allows 98100327 to attenuate EMI and RFI radiation by dissipating it as heat. The material is used in a variety of applications including aircraft, medical devices, and other sensitive electronic equipment.

The working principle of 98100327 is based on the Faraday cage effect. This effect states that an electromagnetic wave incident on a conducting shield will be partially reflected and partially absorbed, depending on the frequency, angle, and distance of the wave. For 98100327, the nickel-graphite shielding layer absorbs the higher frequency components of an electromagnetic wave, while the copper layers act as a Faraday cage, reflecting and diffracting away the lower frequency components. This combination of absorption and reflection results in a significant attenuation of the incident radiation.

Conclusion

EMI and RFI shielding and absorbing materials, such as 98100327, are designed to protect sensitive electronic equipment from electromagnetic interference. These materials work by dissipating electromagnetic radiation as heat or reflecting it away using the Faraday cage effect. Shielding and absorbing materials are essential for ensuring that sensitive electronic equipment operates correctly and without disruption.