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The combination of RFI and EMI shielding and absorbing materials is a crucial aspect of electronic structure design. These materials help protect sensitive electronic components from electromagnetic radiation in a variety of applications. RFI and EMI shielding materials can be used to protect from radio-frequency interference (RFI), as well as electromagnetic interference (EMI). They are often found in circuit boards, wire harnesses, communication cables, and general electronic products. This article will go over the various types of RFI and EMI shielding and absorbing materials, their application fields, and their working principles.

Types of RFI and EMI Shielding and Absorbing Materials

RFI and EMI shielding and absorbing materials are typically divided into two categories: conductive and absorptive. Conductive materials are those that conduct electricity, usually coatings or fabrics made of metal alloys. They act as a shield against the electromagnetic radiation by “reflecting” or “redirecting” the radiation away from the sensitive electronic components. Alternately, absorptive materials block electromagnetic radiation by absorbing the energy before it can reach the sensitive components. These materials are made from Carbon black, graphite, magnetoresistive materials, and other compounds.

Application Fields

The primary application for RFI and EMI shielding and absorbing materials is in the protection of sensitive electronic components. These materials are commonly used in various applications such as Medical electronics, communication systems, data centers, radar systems, automotive systems, military systems, industrial systems, and aviation systems. In addition, shielding material can also be used to prevent the transmission of interference from one frequency to another. This is important in applications where multiple processors are operating in close proximity, as these components can be vulnerable to interference from one another.

Working Principle

Conductive shielding materials work by “reflecting” or “redirecting” the electromagnetic radiation away from the components. This is done by either a reflective coating (such as silver plating) or a conductive fabric. The reflective coating is composed of a metal or metal alloy. The conductive fabric is composed of a fabric substrate with a conductive material applied to it. The conductive material is usually made of metal alloys. Both of these methods create an effective “barrier” that prevents the interference from reaching the sensitive electronic components.

Absorptive shielding materials work by absorbing the electromagnetic radiation before it can reach the components. They contain a variety of compounds, such as carbon black, graphite, and Magnetoresistive materials, that absorb the energy of the electromagnetic radiation. This absorbed energy is then dissipated in the form of heat, preventing it from reaching the components.

Conclusion

RFI and EMI shielding and absorbing materials are an essential part of electronic structure design. They are used to protect sensitive electronic components from interference, allowing for the efficient operation of the device. These materials come in either conductive or absorptive varieties, and can be used in a variety of applications such as medical electronics, communication systems, data centers, radar systems, automotive systems, military systems, industrial systems, and aviation systems. Additionally, their working principles involve either the reflective or conductive properties of the material (in the case of conductive materials), or the absorption of electromagnetic radiation (in the case of absorptive materials).

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