27066386

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The need for RFI and EMI shielding materials is an essential requirement in many industries. Shielding materials are used to reduce the interference caused by electromagnetic and radio-frequency (EMF/RF) interference, and they can range from simple metal boxes to multi-layer solutions that provide much higher levels of protection.

The most effective RFI and EMI shielding materials are those designed to effectively absorb and attenuate electromagnetic signals. Absorption is the process of converting energy from an electromagnetic signal into heat energy. Attenuation is the process of reducing the magnitude of an electromagnetic signal as it traverses the shield.

27066386 application field and working principle is based on the “conductive barrier effect.” In this, a thin layer of highly conductive material, such as copper, is placed between the area in which an electronics device is operating, and outside sources of interference, like strong electromagnetic fields. The material has an electrical resistance such that any EMF signals passing through it are converted into heat and dissipated away. This method is used to great effect in automotive and communications applications.

Another effective type of EMI and RFI shielding material is the use of multiple layers of metals bonded together. This allows for a greater amount of attenuation of the EMF signals passing through, and reduces the amount of interference drastically. The amount of metal and thickness of the shield can be modified to give a greater or lesser amount of EMF protection, depending on the application. Some of these multi-layer shields are called barrier tapes, and these can be cut, folded, and formed around the protected piece of technology.

Finally, another type of shielding material is a transmitting foil. This is a thin membrane of material, usually Mylar, with a conductive surface. This material is most commonly used to reduce signal attenuation over long distances. It is often used with antennae, and its purpose is to reflect the signal while also absorbing any outside signal interference.

No matter what type of RFI and EMI shielding material is used, it must be installed correctly in order to provide the correct level of protection. When installation is done properly, the interference from outside electromagnetic signals should be greatly reduced, allowing the electronics systems to function more efficiently.

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