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Introduction

RFI and EMI shielding and absorbing materials are essential components of many electronics systems. In particular, they are used to protect telecommunications systems, medical and military equipment, and other sensitive equipment from electromagnetic interference (EMI). The 3M CN4490 2” X 4”-25 application field and working principle provide an important example of the use of RF and EMI shielding and absorbing materials in electronic systems.

3M CN4490 2” X 4”-25 Application Field

The 3M CN4490 2” X 4”-25 is specifically designed to shield against EMI and RFI in cellular and wireless applications. It is also used in a variety of commercial and industrial applications, including aircraft, the automotive industry, and the military. This shielding material is most effective when placed around antennas, grounding systems, or components that are sensitive to EMI. It can be used in conjunction with other RF absorbents, such as additional RF shields, ferrites, and RF absorber layers.

3M CN4490 2” X 4”-25 Working Principle

The 3M CN4490 2” X 4”-25 provides effective shielding from EMI and RFI due to its composite structure, which consists of layers of absorber materials glued together to form a semi-rigid construction. The shielding material is comprised of a core layer of 3M EMI Absorbers as well as layers of 3M EMI Shielding Foil, which is applied on either side of the core layer. The 3M EMI Absorbers and 3M EMI Shielding Foil are both designed to absorb and reflect RF and EMI.When RF or EMI waves come into contact with the shielding material, they are absorbed by the absorbers and reflected by the shielding. The shielding material is designed to be effective at frequencies ranging from 30 MHz up to 1 GHz, and is capable of providing up to 45 dB shielding effectiveness. This makes it ideal for cellular and wireless applications, as well as applications that require intense shielding.

Conclusion

The 3M CN4490 2” X 4”-25 is an important example of the advantages of RF and EMI shielding and absorbing materials. It is suitable for applications where intense shielding is required, making it an ideal choice for cellular and wireless applications, the automotive industry, the military, and aircraft. Additionally, its composite structure of absorber materials and shielding foil provides excellent shielding performance across a wide frequency range.

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