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RFI and EMI - Shielding and Absorbing Materials

Radio Frequency Interference (RFI) and Electro-Magnetic Interference (EMI) are two completely different sources of radio frequency interference. RFI is caused by the radio frequency spectrum, while EMI is caused by electric current. In order to prevent electromagnetic and radio-frequency interference from entering an electronic device, special materials are required to provide the necessary shielding and absorption.Materials used to provide shielding and absorption come in many forms. Common materials include metal sheeting, metal mesh, and flexible fabrics. Each material type provides a different level of shielding and absorption, as well as different physical properties that make them suitable for different applications.

Metal sheeting is one of the most common materials used to provide shielding and absorption. This material is composed of thin sheets of metal that is cut, bent, and layered together to form a protective shield. It is most commonly used to protect sensitive electronic components from radio frequency interference. The material is also used in other applications such as radiation protection, thermal insulation, and electrostatic dissipative materials. Unfortunately, metal sheeting is not as effective in absorbing electromagnetic energy and can actually amplify some frequencies.

Metal mesh is a type of shielding and absorbing material that is composed of interwoven strands of metal. It is often used to cooperatively block magnetic fields and absorb incoming radiation. Like metal sheeting, it can be used in a variety of different applications, such as radiation attenuation, electrostatic dissipative materials, and thermal insulation. Metal mesh also performs better than metal sheeting when it comes to absorbing incoming radiation and is often more aesthetically pleasing.

Flexible fabrics are also a type of shielding and absorbing material. These materials are often composed of plastic or nylon that is interwoven with metal or other conductive fibers to provide protection from incoming electromagnetic energy. Flexible fabrics are often used in the construction of antennas, cables, and other equipment where protection from EMI is needed. They can also be used in medical imaging, wireless communication, and aerospace applications.

Regardless of the type of shielding and absorbing material, it is important to understand how different materials can protect against radio frequency interference or electromagnetic interference. Metal sheeting is generally more effective at providing protection against RFI, while metal mesh and flexible fabrics are better at providing absorption from electromagnetic radiation. Depending on the application, either type of material may be suitable for the job.

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