3022202 RF/IF and RFID

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RFI and EMI - Contacts, Fingerstock and Gaskets

Radio frequency interference (RFI) and electromagnetic interference (EMI) are terms used to describe the transmission of electronic disturbances, such as electrical surges, static electricity and radio waves, which can interfere with electronic devices when not properly shielded. Contacts, fingerstock, and gaskets, are three of the key components of RFI and EMI shielding products, used to provide an electromagnetic barrier between the source and receiver of the interfering signal.

Contacts are mechanical components that provide electrical connection between two components. In RFI and EMI shielding products, contacts are used to provide a ground point to the equipment, and are also used as the interface between the shielding material and the signals being carried by the cables or connectors. The contacts are typically made of conductive metal, such as aluminum or copper, and are coated with a protective insulation material to prevent corrosion and shorts.

Fingerstock is a segmented flexible metallic barrier used as an anti-fingerstock. This is used to fill the gap between components and circuit boards to provide a consistently low resistance shield. It is a lightweight and corrosion resistant metal product composed of small sections that are wrapped around components and conductive cables to effectively reduce electro-magnetic interference. The fingerstock is a low-cost alternative to expensive shielding materials and provides optimal protection across a wide range of frequencies.

Gaskets are used to form an airtight seal between two surfaces that are not physically connected. In RFI and EMI shielding applications, the gaskets are typically made of a conductive material such as silicone, neoprene or EPDM, which are designed to provide an effective barrier against the passage of EMI from a transmitting source to a receiving medium. Gaskets can also be used in combination with conductive paint or fingerstock to further enhance the shielding effect.

The use of contacts, fingerstock, and gaskets play an important role in the protection of electronic systems from RFI and EMI. By providing an effective barrier between components, the shielding products can ensure that signals are not interfered with, allowing for more reliable and efficient operation of electronic devices. As technology evolves and EMF levels increase, the use of shielding components is becoming increasingly important in order to effectively protect against EMI and ensure a safe and productive electronic environment.

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