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RFI and EMI - Contacts, Fingerstock and Gaskets

Radio Frequency Interference (RFI) and Electro Magnetic Interference (EMI) are the two main categories of interference that can have a negative impact on a system or equipment. RFI is caused by interfering signals generated from a variety of sources outside of the device, while EMI is caused by signals generated within the system itself. RFI and EMI can cause interference, interference-related errors, malfunction, and degraded performance. RFI and EMI can be greatly reduced by using shielding solutions that encase electronic components or systems, such as contacts, fingerstock and gaskets. Contacts, fingerstock and gaskets all provide a measure of attenuation for RF interference, by having the shielding material come into contact with the electronic components and by forming a barrier between the components and the rest of the environment. Contacts, fingerstock and gaskets are effective against the two most basic types of EMI/RFI: conducted emissions and radiated emissions. Conducted emissions are electric currents that are conducted onto other circuits. This is prevented by putting conducting materials between the device and the environment, or by using contacts with high levels of attenuation. Radiation emissions originate from the device itself or its components. This is countered by installing a Faraday cage, with the shielding and isolation gasket material arranged in such a way as to inhibit the escape of this type of radiation. In addition to EMI/RFI attenuation, contacts, fingerstock and gaskets also provide a reliable and low resistance connection between the electronic components and the device. This is accomplished by using the contacts to make contact with the components and the gaskets to prevent arcing and ensure a secure connection. In addition to providing reliable electrical connections, gaskets also provide structural strength and rigidity to the device. Contact materials generally come in two basic types: ferrous and non-ferrous. Ferrous contact materials are usually composed of steel, stainless steel, nickel or copper. The layers of these materials are designed to provide robust contact surfaces that reduce contact resistance and increase the electrical conductivity. Non-ferrous contact materials are made from conductive plastics, carbon or glass epoxy. These materials are often used in high-reliability applications and provide good electrical insulation as well as low contact resistance. Fingerstock is typically composed of metal-based shielding material, such as copper, stainless steel or nickel. It is available in various forms, including continuous and molded shapes, and can be used in a variety of applications, such as shielding cables, internal components or internal electronics. The metal shielding provides high levels of attenuation, protecting against both conducted and radiated emissions. Gaskets are commonly used for environmental sealing of electronic components. They provide mechanical and electrical protection to the components or devices, and also help keep contaminants out of the assembly. They are normally composed of a foam material that is resilient enough to withstand compression and provide sealing and insulation. Gaskets can also be made from rubber or plastic, with different materials providing different levels of sealing or insulation performance. In conclusion, contacts, fingerstock and gaskets are used for providing shielding and noise isolation solutions to RF interference and EMI applications. The different materials used for these components all provide reliable and low resistance connections, as well as efficient levels of attenuation for both conducted and radiated emissions. By using these components, it is possible to protect sensitive electronic components or systems from interference and improve the overall performance of the equipment.

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