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Radio frequency interference, also known as RFI, and electromagnetic interference, or EMI, are two distinct but related forms of interference that affect military and commercial systems. These forms of interference are caused by the transfer of energy from a radio frequency or electromagnetic source to other electronic components. This interference can cause faults in system operations, and even communication losses. Fortunately, there are certain products and solutions available for preventing, reducing, and managing RFI and EMI interference.One of the most important components of a successful RFI/EMI defense system is contacts, fingerstock, and gaskets. Contacts, especially those found on electronic circuits, act as a better conductor than air, which is essential for preventing and managing RFI and EMI interference. Fingerstock is a type of specialty stock, which helps to reduce EMI issues by providing improved electrical continuity between two contact points. Gaskets, which act as a barrier, are designed to prevent and reduce noise from external sources, as well as provide additional contact stability.The exact type of contact, fingerstock, and gaskets necessary depends on the application and specific environmental conditions. In order to achieve the best results, designers should take into account variables such as temperature, dust, moisture, and vibration when selecting the appropriate parts.The most common type of contact used in RFI/EMI defense systems is the gold-plated contact, also referred to as a “finger contact.” Gold plated contacts are typically used for high-reliability applications where the environment may contain moisture and dust. This type of contact is designed to reduce contact resistance and improve electrical performance. Gold plated contacts are also corrosion-resistant, which helps to ensure overall system reliability.Fingerstock is a specialized form of stock that is designed to reduce the EMI noise. Fingerstock is made of multiple layers of materials with different permittivity and conductivity ratings. The innermost layer of the material acts as an insulator, while the outer layers act as conductors. The various layers of the material act to create a series-type contact that reduces the EMI noise.Gaskets are also an essential component to a successful RFI/EMI defense system. Gaskets are typically made of a vinyl-based material and are designed to provide a positive seal that prevents external sources of noise from entering the system. Additionally, they can also act as a mechanical isolator to provide additional contact stability and prevent vibration-induced contact degradation.Overall, contacts, fingerstock, and gaskets are a vital component to the success of an RFI/EMI defense system. By utilizing these components, designers can ensure that their system runs reliably and safely. Furthermore, by selecting the appropriate parts for the application and environment, designers can reduce contact degradation, EMI noise, and system faults.

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