78084099

Series:	ECCOSORB®
Part Status:	Active
Type:	Absorbing Sheet
Shape:	Sheet
Width:	24.016" (610.00mm)
Length:	24.016" (610.00mm)
Material:	Polyurethane Foam
Operating Temperature:	--

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RFI and EMI – Contacts, Fingerstock and Gaskets

Radio Frequency Interference (RFI) and Electromagnetic Interference (EMI) form a class of electronic interference that is radiated from the environment or deliberately generated, often unintentionally. This type of interference can have serious adverse effects on the performance and communication systems of all types of electronic equipment including aircraft, medical, military and navigation systems. Contacts, fingerstock and gaskets form a key part of the defence against this type of interference, and this article will detail their application field and working principle.

Contacts

Contacts provide a physical barrier between objects by providing complete electrical isolation across different metal surfaces. The contacts must be sufficiently reliable to form a robust, effective seal against moisture, dust, and other contaminants. Furthermore, they must be able to withstand relatively high electrical voltages without breakdown, making them ideal for use in RFI and EMI applications. Contacts are available in a variety of shapes and sizes, and are typically made of either metal or plastic.In RFI and EMI applications, contacts are often incorporated into cable assemblies or integrated into devices to provide the necessary shielding from radio frequency interference. The contacts are arranged in such a way as to form a physical barrier between components, thus preventing the interference from entering the device or cable assembly and causing malfunctions.

Fingerstock

Fingerstock is another type of contact used in RFI and EMI applications. Fingerstock is usually made of brass or stainless steel, and is used in conjunction with contacts to provide additional shielding from outside interference. As the name suggests, fingerstock consists of a number of small fingers which are fitted into grooves in the contact to ensure a reliable connection and effective seal against outside interference.The use of fingerstock to provide additional shielding has several advantages, including improved shielding performance, increased flexibility and easier installation. Furthermore, the use of fingerstock also provides improved EMI shielding in higher frequencies, thus making it suitable for use in a variety of applications.

Gaskets

Gaskets are another type of contact commonly used in RFI and EMI applications. Gaskets are typically made from a variety of materials, including rubber and EPDM, and offer a robust seal against outside interference. Unlike contacts and fingerstock, gaskets are usually self-aligning, meaning that they will form a reliable seal regardless of the orientation or size of the components in the assembly.Gaskets offer improved electrical shielding performance in both low and high frequency applications, and are suitable for use in a variety of situations. For example, gaskets can be used in door seals to prevent RF leakage from entering the area, or in RF shielding enclosures to keep interference out.

Conclusion

In conclusion, contacts, fingerstock and gaskets are essential components for effective RF and EMI shielding. They provide a physical barrier between devices by providing electrical isolation, and also offer improved shielding performance at a variety of frequencies. As such, they are an invaluable tool in the defense against RFI and EMI interference.

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