64009161

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Part Status:	Active

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RFI and EMI - Shielding and Absorbing Materials

Radio frequency interference (RFI) and electromagnetic interference (EMI) are two types of electromagnetic radiation originating from sources such as radio and television transmitters, radar equipment, electronic devices, and other electrical appliances. Shielding materials can help reduce the level of interference, especially in RF-sensitive applications.Radio frequency interference (RFI) is radio frequency energy generated by unintended radio transmitters and other devices. Examples of RFI may include wireless devices such as cordless phones, wireless routers and wireless gaming systems. The interference from these devices can affect the performance of other electronic equipment in the area.Electromagnetic interference (EMI) is a form of electromagnetic radiation caused by the coupling between different circuits or other sources. Sources of EMI can be external such as power lines, radio transmitters, and other sources of electrical noise, or they may be generated internally from the electronic circuit itself.The most common way to reduce electromagnetic interference (EMI) is the use of shielding and absorbing materials. Shielding materials absorb, dissipate, deflect, clip or reflect electromagnetic radiation, reducing the level of interference. In addition, shielding provides a physical barrier between the equipment and the source of the interference.Examples of shielding materials include metallic foils, conductive coatings, and ground planes. The choice of material and its dimension depends on the frequency of the EMI. Aluminum or copper foils are mainly used in lower frequency applications, while high-frequency applications typically require the use of specialized metallic or organic multi-layer boards.Absorbing materials are specifically designed to absorb EMI energy, preventing the radiation from radiating into the environment. Absorbing materials absorb the energy of the incident radiation, and then dissipate it as heat. Polyurethane foam is often used in high frequency applications as an absorbing material, while carbon impregnated materials can be used in lower frequency applications.The 6400-9161 application field is an example of a high frequency application, and therefore the use of shielding and absorbing materials is essential to minimize the level of interference and to ensure reliable operation of the device. This application requires the use of multi-layer designs with metal foils and materials such as carbon impregnated plastics and polyurethane foam. With the proper selection of materials and the correct design, it is possible to achieve significant shielding effectiveness in this application.

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