21164176

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Radio frequency interference (RFI) and electromagnetic interference (EMI) are major issues for many of today’s modern electronic systems. RFI and EMI interfere with the functioning of a device, resulting in poor performance, decreased signal-to-noise ratio, or decreased RAM or data availability. In order to minimize the adverse effects of RFI and EMI, shielding and absorbing materials have been developed to protect sensitive electronic components and systems.

The common 21164176 application field and working principles of shielding and absorbing materials are similar. Shielding materials are usually made of conductors that are able to block, divert, or absorb electromagnetic energy. The energy is diverted either to ground or to another conductor in a circuit, thus preventing it from reaching the sensitive electronic components. Shielding materials are typically made of metals, such as copper, aluminum, steel, or other conductive materials, such as foam or fabrics.

The application of shielding materials can be found in many different areas. Telecommunications systems, electrical power systems, and electronic equipment use shielding materials to protect sensitive components, systems, and wiring from radiation-induced and electro-magnetic interference.

Absorbing materials, also known as absorbers, use materials which have high electrical impedances. This mechanism is used for absorbing incident electromagnetic waves, which results in subduing the amplitude of the reflected wave and thus blocking the incident radiation or signal from being received by the components or systems. Absorbing materials are capable of reducing or eliminating completely the unwanted signals from the surrounding environment. Absorbing materials are usually made of materials such as rubber, plastic, foam, fabrics, and other high impedance materials.

Absorbing materials are also widely used in many applications and include such products as engine noise dampening liners and acoustic dampening foams used in electronic equipment. In addition, absorbers are used to reduce the noise in automobiles and reduce interference to radios and other communication systems.

Shielding and absorbing materials can be used in combination for optimal performance. The combination of these materials can block RFI and EMI interference and protect sensitive electronic systems and components. The most advantageous applications are those that are designed to provide optimal shielding from RFI and EMI, as well as maximum signal performance for electrical and electronic systems.

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