27091173

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RFI and EMI - Shielding and Absorbing Materials are devices that are commonly used in to protect electronic equipment from the radiation from high-frequency electromagnetic fields. Radio Frequency Interference (RFI) and ElectroMagnetic Interference (EMI) can have deleterious effects on many different types of electronic devices, resulting in degraded functioning and reliability. By shielding sensitive components from both inbound and outbound signals, it is possible to mitigate these issues.

The 27091173 application field is centered on the two aspects of RF and EMI shielding and absorbing materials – the shielding portion provides for the physical protection of the component, whereas the absorbing portion focuses on using specialized materials to dissipate and disperse the radiation.

For the physical shielding aspect, this can involve either a metallic shield (typically aluminum, copper, silver, or steel) or a non-metallic shield (such as a plastic/rubber/ceramic coating). Shielding involves increasing the impedance between the source and the victim so that the desired signal is attenuated by the RF/EMI shielding material. These shielding materials can come in coaxial cables, laminates, films, single foils, or absorbers, depending on the requirements.

The absorber type of material is perhaps even more important than the actual physical shielding for ultimately managing and mitigating the effects of interference. Specialized materials, such as spongy foam, carbon-filled vinyl, or metallic foils, are used to absorb the incoming signals. The materials used will depend on the wavelength of the signal being shielded, as different materials are more absorbent at different frequencies. For instance, certain materials absorb higher frequencies more readily, while others are better suited to lower frequencies.

Finally, the 27091173 working principle of RF and EMI shielding and absorbing materials is to provide a physical barrier between the source and the victim of the interference. By creating this barrier, the interference is blocked from entering the system or component. In addition, absorptive materials are also applied to absorb and dissipate any inbound interference.

By providing proper RFI and EMI shielding and absorbing materials, the effects of interference can be greatly reduced, which is critical in ensuring the proper functioning and reliability of electronic components. Additionally, these materials can also be useful in reducing interference with other nearby devices, creating a more harmonious environment for all those involved.

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