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RF Interference and Electromagnetic Interference (RFI and EMI) are two of the most severe challenges facing any electrical system. RFI is caused by electrostatic and radiating fields while EMI is caused by short-circuiting and arcing due to improper contact and shielding. Here, we discuss the application fields and working principles of contact, fingerstock, and gaskets in RFI and EMI.

Contacts

Contacts are an essential component in any electrical system, designed to connect two conductors in order to ensure an efficient flow of electricity. In RFI and EMI, contacts not only provide electrical connections, but they also transfer electromagnetic energy into the system. Due to its small size, contacts are susceptible to induced noise due to the capacitive nature of electromagnetic fields.

This induced-noise is counteracted using a contact fingers and contact springs. The contact finger is a metallic component designed to make contact with the other component and form a conductive path that all the electric current will flow through. The contact spring is also made of metal and is designed to absorb energy from incoming waves and dissipate it, reducing the level of disruption caused by the waves.

Fingerstock

Fingerstock is a term used to describe a flexible metal ribbon used to connect two conductive components together. Generally, fingerstock consists of a flexible metalized polyester film which is bonded to a conductive material such as copper or brass. The flexible ribbon is designed to flex and move with the movement of the components, allowing for a reliable contact between the two. By using fingerstock, a conductive connection can be formed without causing any damage to the components.

In RFI and EMI, fingerstock is used to couple the electronics or components of a system together. The flexible metallic ribbon helps reduce the amount of energy transfer within the system by reducing the capacitive effect of the electromagnetic waves, thus reducing the induced-noise. Furthermore, fingerstock also increases the reliability and performance of the system by reducing unwanted contact bounce (the momentary reconnection of two contacts).

Gaskets

Gaskets are components which are used to provide a physical and electrical seal between two components and/or surfaces. They are typically made of rubber, silicone, or non-conductive plastic. Gaskets are used in RFI and EMI to electrically isolate two components and to provide a physical barrier against electromagnetic radiation. This reduces the potential for interference between the two components and helps limit the amount of conducting energy between them.

Gaskets are also used to provide a physical barrier against heat and moisture, both of which can affect the performance of any electrical system. By using gaskets, the system is more protected from the environment, allowing it to perform optimally. Furthermore, gaskets can also be used to reduce unwanted vibration, noise, and shock.

In conclusion, contact, fingerstock, and gaskets are all essential components of RFI and EMI. They are used to reduce interference, improve performance, and protect the system from the outside environment. Although each component has its own unique purpose, they all work together to keep electrical systems safe and efficient.