3M CN3490 3" X 3"-25

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RFI and EMI - Shielding and Absorbing MaterialsRadio frequency (RF) electromagnetic interference (EMI) shielding is a process of protecting electronic equipment from being affected by electromagnetic radiation. It is accomplished by placing an electromagnetic absorbing or shielding material around the device or system. These materials typically consist of sheets of metal foil, metalized film, or fabrics, which absorb and attenuate the interfering RF radiation. When combined with an electrical ground connection, these materials create an effective Faraday shield, isolating the device from the source of interference.3M CN3490 3" x 3"-25 material is an example of an RF and EMI shielding and absorbing material. It is composed of a highly conductive aluminum coating bonded to a woven fiberglass substrate. The material has a wide range of uses, from shielding against high-frequency EMI, to absorbing dynamic and static charges generated in high-voltage systems.The main function of CN3490 is to absorb high-frequency RF energy emitted by electronic components. The metalized layer on the material acts as an effective RF barrier, blocking out the radio energy before it can reach the device. This barrier also provides a path for static charges or electric currents to flow away from the device, reducing the effects of EMI on the system. In addition, the material also acts as an effective EMI absorber, absorbing and dissipating the RF energy before it has a chance to interfere with the system.The working principle behind CN3490 is based on the same principles of Faraday shielding. When an electrical current passes through CN3490 material, electrons are created in response to the electric field. These electrons move in a circular motion, creating a protective barrier which shields the system from high-frequency radiation. The electric current also produces an opposite charge, which is attracted to the metalised layer, resulting in an absorption of the RF energy.In addition to its RF shielding and absorption capabilities, 3M CN3490 is also flame retarded, making it an excellent choice for high-voltage equipment and wiring applications. It is also very flexible and can be cut to custom shapes and sizes to fit most applications, making it a versatile material for a wide range of uses.The 3M CN3490 is an all-purpose EMI shielding and absorbing material that offers protection from high-frequency RF radiation. By creating an effective Faraday shield and providing an efficient static and electric current path, the material can effectively shield and absorb RF energy, while also providing flame-resistance and flexibility for versatile applications.

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