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RFI and EMI - Shielding and Absorbing Materials

38M3020AA1212 Applications Field and Working Principle

38M3020AA1212 is a type of Radio Frequency Interference (RFI) andEvanescent Mode Interference (EMI) shielding material. It is constructed by a  matrix of high-density porous polyolefin foam, combined with conductive fillers and compounded into a single layer film. This product is designed to provide excellent absorbefor shielding electrical signals thus preventing them from radiating and leaking from the electronics enclosure.

The purpose of the 38M3020AA1212 is to reduce RF and EMI  noise from leaving an electronics enclosure. It also filters out signal interferences from external sources, preventing the internal electronic components from being damaged or malfunctioning. Its shielding effectiveness is around 99.99%, which is higher than other common shielding materials such as metallized fabrics.

Working Principle

The 38M3020AA1212 works by using the principle of electromagnetic shielding. This is done by creating a conductive barrier between the source of the electromagnetic (EM) radiation and the receiving environment. The foam matrix of the 38M3020AA1212 material absorbs and reflects the EM radiation away, thus preventing it from entering the interior of the electronics enclosures.

The material is also equipped with a conductive filler, such as carbon black, metal flakes or graphite particles. These particles help to reduce the capacitance between the foam and its surroundings, thus improving the shielding effectiveness.  By allowing static charges to be dissipated, the conductive fillers help reduce electrical interference.

The 38M3020AA1212 has higher shielding effectiveness than other materials, due to its high-density porous foam matrix, which allows for the absorption of EM radiation over a broad frequency range. This means that more of the sometimes harmful signals are kept from entering the electronic enclosure. The absorbefrom this material are also highly advantageous, as they attenuate incoming high-frequency signals.

Application Fields

Due to its excellent shielding and absorbing properties, the 38M3020AA1212 is suitable for a range of applications where the prevention of EMI and RFI contamination is of utmost importance. It is widely used in many fields such as aerospace, military, automotive, telecommunications, medical electronics, and consumer electronics.

Specially engineered products have also been developed for use in areas where high temperature, humidity, and/or harsh chemicals need to be met. This type of material is designed specifically for use in high-stress environments such as power generation facilities, industrial heating and cooling systems, and nuclear power plants.

The 38M3020AA1212 can also be used to reduce the EM radiation emanating from an electronic device, by providing a conductive barrier between the device and the environment. It is also beneficial when used in conjunction with Radiation Barrier Enclosures (RBEs) to provide superior shielding performance in a range of applications.

Conclusion

The 38M3020AA1212 is a type of shielding and absorbing material used to prevent the emission of EM radiation. It is constructed with a high-density foam matrix, combined with conductive fillers, and is designed to provide superior shielding effectiveness over a broad frequency range. This material is ideal for applications where the protection of electronic components from external EMI and RFI interference is required. It is widely used in many areas such as aerospace, military, automotive, telecommunications, medical electronics and consumer electronics.

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