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The purpose of RFI and EMI - Contacts, Fingerstock and Gaskets are all around controlling electromagnetic interference and radio frequency interference. Radio Frequency Interference (RFI) is produced by the transmission and reception of RF energy. The best way to reduce this interference is shielding, a thin metallic layer, usually on the outside of a device, to absorb or reduce the passage of electromagnetic fields.

The purpose of Contacts, Fingerstock and Gaskets are to provide excellent shielding coverage of various enclosures and openings. Contacts consists of a snapped piece of metal that contacts or clips onto the metal enclosure. Fingerstock refers to a metal circular cut-from a coil into an ‘U’ shape. The stock should be applied over an uncovered edge or around an opening to provide the enclosure with a good level of shielding. Gaskets are make from a rubbery material and often with wire embedded. They are typically installed in small openings in multi-media cabinets or computing desks that were not included in the original design.

The application field for Contacts, Fingerstock and Gaskets can vary depending on the design. In one particular application they may be used in electrical enclosures to reduce EMI/RFI from entering or exiting. This could be for purposes such as research, engineering, and communication applications. For example, in automotive safety systems, these components can be used to meet specific interference emission requirements. There are a variety of compliance standards that can be considered here, such as the EN 55011 standards for Radiated Emissions, and EN 55026 for conducted transmissions.

When it comes to the working principle, Gaskets are designed to provide a waterproof closure as well as a low impedance contact for EMI/RFI signals. This can be done in two ways, either by compression or magnetic contact. When compression is used, a spring clip with a ferrite core is applied in the opening and then compressed to contact thin metal leads. Magnetic contact means the gasket is made up of two parts including a ferrite half and a copper half, which when in close proximity to each other, will magnetically contact one another and form a low impedance, EMI/RFI shielded joint.

In summary, Contacts, Fingerstock and Gaskets are commonly used to reduce electromagnetic interference and radio frequency interference. Designers of electronic devices and systems need to determine the best approach, depending on the application and the effectiveness required. Gaskets are best used to provide waterproof closure as well as a low impedance contact for EMI/RFI signals, and should be designed to meet the relevant compliance standards.

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