29100015 RF/IF and RFID

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Overview of RFI and EMI - Contacts, Fingerstock and Gaskets

Noise, or Radio Frequency Interference (RFI) and Electromagnetic Interference (EMI), is interference that affects electrical signals. This type of interference can be caused by a variety of sources, including physical contacts, gaps between conductors, and physical spaces (gaskets). In order to reduce the effects of RFI and EMI, it is important to consider the type of contact material, fingerstock, and gasket that are used in a design.

Contacts

Contacts are devices that are used to make or break an electrical connection. These devices can be found in a variety of applications, including telecommunications, electrical and electronic systems, automotive, and industrial systems. The type of contact material used in these applications can greatly affect the noise emitted by the system. In order to reduce the amount of noise generated, it is important to choose a contact material that is designed to be resistant to RFI and EMI.

For example, a carbon material may be used in applications that require a high degree of corrosion resistance, while gold-plated contacts are often used in applications that demand superior durability and high signal integrity. Nickel-plated contacts are often preferred for applications that require good conductivity. Silver-plated contacts are preferred for applications that need superior electrical and thermal characteristics. Additionally, ceramic is often used as a contact material in applications that need superior RFI and EMI capabilities.

Fingerstock

Fingerstock is a type of thin metal that is used in contact assemblies. It is often used to form electrical contacts between two wires or between two wires and another component. Fingerstock materials are generally manufactured from nickel alloys because of their superior resistance to corrosion and oxidation. The thickness of the fingerstock material can vary, and the type of material used will depend on the application. For example, fingerstock materials used for data and signal transmission will generally be thinner than those used for high-current applications.

The type of fingerstock used will also affect the performance of the application. For example, if a higher degree of RFI and EMI protection is required, the fingerstock material can be made from a material with higher shielding properties. Additionally, the fingerstock can also be treated to reduce its susceptibility to corrosion or oxidation.

Gaskets

Gaskets are another important factor to consider when designing a contact assembly. Gaskets are used to fill in gaps between components and help to reduce the amount of noise generated. The type of gasket material used can vary depending on the application. For example, silicone may be used in applications that require a high degree of durability, while foam may be used in applications that require superior RFI and EMI characteristics.

In addition to the type of material used, it is also important to consider the type of gasket seal that is used in the application. For example, an O-ring seal may be used in an application that requires a high degree of reliability and vibration resistance. In applications that require superior RFI and EMI protection, a porous gasket may be used to absorb the electrical noise.

Conclusion

RFI and EMI are important considerations when designing contact assemblies. The type of contact material, fingerstock, and gasket materials used in the design can have a significant effect on the amount of noise generated. Therefore, it is important to select the materials and components that are best suited for the application. Additionally, understanding the type of contact materials and gaskets that can provide the best protection against noise is essential to ensuring the performance of the application.

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