21148175

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Electromagnetic shielding (EMS) is used to protect electronic equipment from the effects of radio frequency (RF) and electromagnetic interference (EMI). This shielding is accomplished by absorbing and reflecting the energy emanating from the source of interference. A shielding material can be divided into two categories; RF shield materials that act to reflect the energy, and EMI shield materials that absorb the energy. This article will discuss the 21148175 application field and working principles of shielding and absorbing materials.The 21148175 application field covers a range of industries that require protection from RF and EMI radiation. Common shielding applications include military and aerospace, communications, medical, industrial, and consumer electronics. The components used for these applications can range from large metal housing structures to small metal tape or EMI/RF absorbing foam products.The effectiveness of shielding materials is largely determined by their conductivity and dielectric properties. Conductive materials such as aluminum, copper, and stainless steel are used to shield against high frequency energy sources. These materials are highly reflectiv, and can effectively block RF signals.For low frequency sources such as AM radio, ferrite or mu-metal materials are often used. These metals typically have a high electrical permeability, and act to absorb rather than reflect the incoming energy. This absorption limits the amount of energy that reaches the equipment, thereby reducing the radio interference.When it comes to EMI shields, the ability of the material to attenuate EMI radiation is key. Materials with a high resistivity, such as fiberglass or rubber, are used to absorb the incoming energy. The more resistant the material, the greater the attenuation.In addition, a combination of materials can be used to further enhance the effectiveness of the shielding. Common combinations include a conductive metal layer on one side and an absorptive material on the other. This configuration creates an effective barrier that blocks the interference from entering the equipment.The choice of materials and design of the shielding device must be carefully considered in order to ensure that the desired level of protection is achieved. Different materials offer varying levels of protection, and the overall effectiveness of the shield will be determined by the number of layers, the thickness of each layer, and the materials used. Additionally, the design must also take into account the environment in which the equipment will be installed in order to achieve the desired level of protection.In conclusion, shielding and absorbing materials are used to protect electronics from the effects of RF and EMI radiation. The choice of materials, design, and configuration of the shielding device must be carefully considered in order to achieve the desired level of protection. By using conductive materials that reflect high frequency signals, and absorptive materials that attenuate low frequency signals, an effective barrier can be created that will protect the equipment from radio interference.

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