24499173

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Radio Frequency Interference (RFI) and Electro-Magnetic Interference (EMI) are two external sources of electromagnetic waves that can interfere with the operation of radio and other electronic transmission and communication equipment. Shielding and absorbing materials are designed to protect electronic devices from the harmful effects of these external electro-magnetic waves. 24499173 shielding and absorbing materials are used for applications in a wide variety of industries, ranging from commercial and industrial applications to military and medical applications.

The two main types of shielding and absorbing materials used to protect electronic equipment from RFI and EMI interference are metallic shields and absorbers. Metallic shields are designed to reflect the electro-magnetic waves, preventing them from reaching the electronic equipment. Absorbers are made from special absorbing materials that can absorb the electromagnetic waves before they can reach the electronic components of the device. In addition to shielding and absorbing materials, other components such as ferrite cores, metal enclosures, and angled connectors are also used to protect electronic systems from interference.

Metallic shields act as physical barriers, reflecting the electro-magnetic waves away from the equipment. Metals such as aluminum, copper, and steel are commonly used as shielding materials because they are good at reflecting electro-magnetic energy. Copper is the most common shielding material due to its high electrical conductivity and its ability to reflect most frequency ranges. Aluminum and steel are often used for applications with higher frequencies and where more corrosion protection is needed. Shielding materials can come in a variety of shapes and sizes, including sheets, foils, and tubes.

The main type of absorber material used is foam. The foam is usually made from polyurethane, which has a closed-cell structure that is effective at reflecting and dissipating electro-magnetic energy. The foam is usually applied to the inside of metallic enclosures such as boxes, chambers, and cabinets to help insulate the electronic equipment from the outside electro-magnetic radiation. Other common absorber materials include rubber, elastomers, fabrics, and glass wool.

In addition to shielding and absorbing materials, other components such as ferrite cores and metal enclosures can also be utilized to protect electronic systems from interference. Ferrite cores are small cylinders made from ferrite that can be used to absorb electro-magnetic energy by transforming it into heat. Metal enclosures are also used to provide an electrical barrier between the outside environment and the internals of the device, effectively blocking electro-magnetic energy from reaching the components.

24499173 application field and working principle of shielding and absorbing materials can help protect electronic systems and components from the harmful effects of both RFI and EMI interference. Shielding materials act as physical barriers to prevent electro-magnetic energy from reaching the electronic components of a device, while absorbers dissipate and reflect the energy before it can reach the internals. Other components such as ferrite cores, metal enclosures, and angled connectors can also be used to further protect electronic systems from interference.

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