24296218

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Radio Frequency Interference (RFI) and Electromagnetic Interference (EMI) have become increasingly important and discussed topics within the electronics industry. Many products and systems are susceptible to interference from electromagnetic sources, or even the same system interfering with itself, which can cause system performance to be degraded or even fail completely. RFI and EMI-Shielding and Absorbing materials can be used to mitigate these effects and provide an efficient and cost-effective solution for protecting systems from interference.The 24296218 application field and working principle of RFI and EMI-Shielding and Absorbing materials involves two distinct strategies for providing effective shielding. The first is to block the electromagnetic energy before it reaches the components, circuits, or systems to which it can cause interference. The second is to reduce or absorb the energy after it has entered an area and prevent it from propagating further.The two strategies combined form a comprehensive shielding requirement, which is typically implemented using metal screens, barriers, or cages, designed to enclose a component, device, or system, and provide directed shielding. The most common barrier material for this type of shielding application is copper, aluminum, or stainless-steel mesh. The size of the mesh holes and the number of layers used will depend on the requirements of the design for the frequency range and types of radiation spectrum that must be blocked or absorbed.For internally mounted components or systems, signal cables or PCB track can be used to form the bulk of the shielding. In this type of installation, the cables/track are surrounded by a foil, such as copper, aluminum, or steel. The choice of material and the thickness of the foil, as well as the number of layers used, depend on the frequency range and type of radiation.In general, EMI/RFI absorbing materials are suitable for controlling low-frequency energy, typically below 1MHz. These materials are either in sheet form, such as absorber foam or pads, or added to PCBs in their component form, for example, clips and slots. The performance and effectiveness of this type of shielding system is usually higher than that of the barrier type, but however, it requires more space and thickness to be effective and thus is not always suitable for all designs.The 24296218 application field and working principle of these materials is also based on reducing the interference that propagates within and outside a system due to power supply, coaxial cables, and other antennas. There are several types of absorbers available for different frequencies and application requirements. Typically, absorbers are made using metallic materials such as copper, aluminum, steel, and combinations of these metals. The metal absorbs the interference energy and creates an impedance discontinuity that resists the propagation of the interference.RFI and EMI-shielding and absorbing materials play an increasingly important role in controlling and mitigating interference in electronic systems. They are used to provide protection from both externally sourced interference, as well as from internally sourced interference, thus ensuring reliable operation of electronic systems and devices.

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