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Radio Frequency Interference (RFI) and Electro Magnetic Interference (EMI) are major forms of electromagnetic radiation emitted by electrical circuits, appliances, or devices. When these forms of radiation enter a system, they interfere with radio reception, circuit noise and even the performance of electrical equipment. In order to reduce and control the interference, radio frequency shielding and absorbent materials are used to reduce or eliminate RFI and EMI.

The most common type of RF shielding material used is metal. Metals have the ability of reflecting radio waves and shielding power supplies, communications systems, electrical circuits, and sensors from electromagnetic interference. These materials are also effective in attenuating noise from high-frequency signals by reflecting the energy away from the source, thus allowing for improved radio reception. This type of shielding is also known as "Faraday" shielding. Examples of metal used for RF shielding include aluminium foil, copper, silver, nickel, brass, and steel.

In addition to metallic shielding materials, there are several other types of RF shielding materials, such as carbon, ceramics, and plastics. These materials are used for specific applications, such as absorbing high-frequency signals. Carbon based materials are useful for damping frequencies, and can often be found in the form of a carbon-loaded sheet or fabric. Ceramics are typically used as thermal insulation, and are effective in absorbing energy, usually from high-frequency signals. Plastics can be effective in reducing EMI, and are mainly used in areas where conductive materials are not suitable. These materials are often chosen for their insulation properties and ability to be formed into complex shapes.

Shielding materials are not the only way to reduce the levels of RFI and EMI. Absorptive materials are also frequently used in order to reduce or absorb the interference. These materials are designed to absorb energy, usually from high-frequency signals. Examples of absorptive materials include ferrite beads, absorptive paints, absorptive shields, and absorptive coatings. These materials are often used in order to reduce signal generation, and can be found in the form of sheets, foams, tapes, and fibers.

By combining RF shielding and absorbent materials, an effective and efficient barrier can be created to reduce the effects of RFI and EMI. The use of absorptive and shielding materials is essential for any electrical system in order to ensure that it is functioning correctly and that the electromagnetic radiation is at acceptable levels. This combination of materials is important for electromagnetic interference mitigation, and can contribute to improved performance and reliability of electrical equipment.

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