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RFI and EMI - Shielding and Absorbing Materials

The purpose of shielding and absorbing materials is to reduce or minimize the effects of unwanted electromagnetic interference (EMI)or radio frequency interference (RFI). These materials that are used in the construction of electronic circuits, equipment, enclosures and components can be divided into two main categories: shielding and absorbing materials.

Shielding materials are used to reduce the amount of energy entering or leaving a device. The shielding material absorbs the energy by providing a conductive path from the source of interference to a ground. The absorbing material absorbs energy without providing a conductive path, thereby reducing the strength of the field at the source location.

Shielding materials are widely used in the application fields such as radio and television broadcasting, computer, military, aerospace, and automotive industries. The working principle of a shielding material is to absorb or reflect the EM signals away from the device, thus minimizing the effects of unwanted electromagnetic interference. The most common type of shielding material is a conducting material which is designed to redirect the EM signal away from the device or component. The conducting material is then connected to a ground to provide a complete shield.

Absorbing materials work on the principle of effectively absorbing the EM signals before it reaches the device. Absorbing materials are able to absorb the energy of the EM signals that pass through it, resulting in a decrease in signal strength. This can be achieved by increasing the impedance of the absorbing material or by creating a physically dense material that will attenuate the signal.

Absorbing materials are typically used in small, enclosed areas to reduce EMI, such as within electronic components, mobile phones, laptops and other portable electronic devices. The most commonly used type of absorbing material is made of a foam or a solid rubber material such as neoprene or silicone rubber, which are designed to absorb EM signals.

In conclusion, shielding and absorbing materials are important in the application field to reduce or minimize the effects of unwanted electromagnetic interference. Shielding materials Redirect the EM signal away from the device, while absorbing materials absorb the energy of EM signals before it reaches the device.

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