3M CN3490 3/4" X 4"-100

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RFI and EMI - Shielding and Absorbing Materials have different applications in controlling the transmission of electromagnetic radiation. The 3M CN3490 3/4” X 4”-100 is one such product used for this purpose. This article explores the application field and working principle of this product.The 3M CN3490 3/4” X 4”-100 is a broad-band absorber designed to virtually eliminate the effect of radio frequency interference (RFI) and electromagnetic interference (EMI) on electronic systems. The absorber is lightweight and conformable, other characteristics making it suitable for applications where space is at a premium. The product is thus typically used for products within the automotive, consumer electronics, communications and medical industries.The 3M CN3490 3/4” X 4”-100 uses a two-layer material composition (a foam solution on the inner layer and removable adhesive on the outer layer) that helps reduce ambient noise levels. The foam core acts to absorb frequencies across the board, while the adhesive coating isolates those frequencies from the source, virtually eliminating distortion. This type of absorber can be used in both small and large rooms, can be installed within minutes and ensures superior performance in eliminating EMI and RFI signals.In terms of its functioning, the absorber works primarily by blocking and absorbing the incoming electrical signals whilst minimizing signal reflections. This is achieved through the absorber’s high-quality absorption layer, which is typically designed to reduce the level of interference and absorb emitted frequencies in the range of 800 MHz to 2.5 GHz. Additionally, absorbers also perform a degree of thermal insulation, thus reducing the potential of overheating at specific components.At the same time, this product also helps to protect sensitive equipment against electro-magnetic interference. The absorber’s physical and electrical characteristics that are primarily used to achieve this end are the controlled impedance and ESD characteristics. The absorber provides an effective barrier between the source of the interference and the connected equipment, blocking signals from crossing over and thus preventing disruption.Overall, the 3M CN3490 3/4” X 4”-100 can be seen as an effective solution for controlling EMI and RFI within any electronic system. It helps block and absorbe incoming electrical signals, stopping them crossing over to sensitive equipment whilst providing a degree of insulation too. In addition, the product is lightweight, conformable and easy to install, making it an ideal choice for areas of limited space.

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