78134077

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Radio frequency interference (RFI) and electromagnetic interference (EMI) are two of the most common sources of electromagnetic energy in today\'s modern world. Both of these forms of energy can adversely affect a wide variety of electronic equipment and components, including satellite communications, cell phones, radios, computers, and other electronic systems. In order to reduce the impact of RFI and EMI on electronic components, shielding and absorbing materials are often used. The 78134077 Application Field and Working principle provides an overview of the various types of materials that can be used for shielding and absorption, as well as the working principles for each type of material.

Copper Sheet and Wire Shielding

Copper sheet and wire shielding is one of the most common materials used in RFI and EMI protection. Since copper is a highly conductive metal, it can effectively shield electronic components from electromagnetic interference. Copper is used not only as shielding, but also as an absorber for EMI. One common technique for applying copper shielding is to place sheets of copper around electronic components, forming a Faraday cage to block out external interference. Another technique is wrapping components with finely-wound copper wire, which provides both shielding from externally-generated interference and electrostatic shielding from internal interference.

Amorphous Metal Ribbon Shielding

Amorphous metal ribbon shielding is an advanced form of RFI and EMI shielding. It is made up of an amorphous metal alloy which consists of thin ribbons of extremely conductive and corrosion-resistant metal. This material has a very high permeability, which makes it very useful for shielding electronic components from both external and internal interference. Due to its high permeability, amorphous metal ribbon shielding can reject RFI and EMI up to 80 dB of attenuation. Amorphous metals are also highly temperature-resistant, which makes them ideal for environments with extreme temperatures, such as inside electronic circuit boards.

Ferrites and Ferrite Cores

Ferrites are soft magnetic materials which are often used in RFI and EMI protection. They can be used either as a shield or as an absorber. When used as a shield, ferrites are placed around electronic components to block external interference. As an absorber, ferrites can be used to absorb the EMI from internal sources, such as power supplies and printed circuit boards. Ferrites come in various shapes and sizes, and are often used in conjunction with finely-wound copper wire or amorphous metal ribbon shielding.

Electromagnetic Absorbing Foam

Electromagnetic absorption foam is also known as EMI absorbing foam. It is a porous material that absorbs both RFI and EMI. It is often used to line the walls of shield rooms, Faraday cages, and other enclosures that are used to shield electronic components from external interference. Electromagnetic absorbing foam is also used to absorb EMI from internally-generated interference sources, such as power supplies, switching circuits, and printed circuit boards.

Shielding Gaskets

Shielding gaskets are used to provide a conductive barrier between two surfaces. They come in different shapes and sizes, and are often used in conjunction with other shielding materials. Shielding gaskets are made from conductive material such as mixtures of rubber, foam, and either copper or aluminum. They are typically placed between two metal surfaces, such as the top and bottom of a circuit board, to create a Faraday cage. Shielding gaskets can also be used to seal gaps around cables and other openings to prevent electromagnetic leakage.

Working Principle of Shielding and Absorbing Materials

The working principle of shielding and absorbing materials is based on the concept of a Faraday cage. A Faraday cage is an enclosed space that acts as a shield against the transmission of electromagnetic energy. The walls of a Faraday cage are made of conductive materials, such as copper or amorphous metal, that allows the external interference to pass around the exterior of the cage. As the external interference passes around the exterior of the cage, the conductive materials act as a shield, and the interference is dissipated. The same principle applies to absorbing materials – they absorb the external interference, preventing it from entering the interior of the cage.

RFI and EMI protection is an essential part of modern electronics, and shielding and absorbing materials are some of the most effective techniques that can be used. By understanding how these materials work, engineers can more effectively protect their components from external interference. The 78134077 Application Field and Working principle provides an overview of the various types of material used for RFI and EMI protection, as well as the working principles for each type of material.

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