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Radio frequency interference (RFI) and electromagnetic interference (EMI) are common phenomena in communication, electronics and military applications. While RFI is generally considered harmless, EMI is often harmful and can reduce the performance of sensitive electronic devices. Contacts, finger-stock and gaskets are three types of shielding materials that are used to protect against RFI and EMI.

Contacts

Contacts are made of metal and are designed to provide low electrical resistance and high reliability for RFI and EMI protection. These contacts can be divided into two categories: fine pitch contacts and wide pitch contacts. Fine pitch contacts can be used in tight configurations to provide more efficient shielding while wide pitch contacts are designed for wide-area applications. The contact materials usually consist of copper alloys, such as copper-nickel and nickel-plated copper. Contacts provide the ability to control the flow of current and act as a source of shielding against RFI and EMI.

Fingerstock

Fingerstocks are used to provide high reliability and excellent shielding properties. The fingerstock material is usually made of plastic or other flexible materials. Fingerstocks are typically used in high-frequency applications, such as portable and laptop computers, networking equipment, cellular phones and other electronics products. Fingerstocks provide excellent shielding properties due to their unique design; they are designed to provide low-resistance pathways that prevent the flow of high-frequency signals.

Gaskets

Gaskets are a type of shielding material that are used in conjunction with contacts and fingerstock materials. Gaskets are designed to provide a hermetic seal that prevents the leakage of energy. Gaskets are made of either a metallic or non-metallic material, such as rubber, plastic or foam. Gaskets’ unique design allows them to provide a more effective seal than other types of shielding materials.

In conclusion, contacts, finger-stocks and gaskets are all used for shielding materials used to protect against RFI and EMI. The selection of the right shielding material is important to ensure maximum shielding efficiency and to protect against the detrimental effects of RFI and EMI.