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RFI and EMI shielding, along with absorbing materials, are two vital components in the industry of communications. RFI, which stands for Radio Frequency Interference, is a spectrum of extremely high frequency electromagnetic (EM) energy which is generated as a consequence of electrical equipment or other sources of EM emanations. EMI, on the other hand, stands for Electro Magnetic Interference, which is generated from the same sources as RFI. The term RFI is generally used to describe electronic signals with frequencies above 300 kHz to 100 GHz, while EMI is used to describe electronic signals with frequencies below 300 kHz. In addition, RFI and EMI are both considered to be a form of electromagnetic radiation and encompass both electrical signals and magnetic fields.

Fortunately, there are solutions to reduce RFI and EMI impacts which can be achieved through the use of shielding and absorbing materials. Shielding refers to constructing an enclosure of some type around a source of interference in order to restrict or prevent its emanations from entering other systems, components, and the like. Typically, shielding consists of material containing metallic surfaces or conductive layers, such as aluminum, steel, or certain alloys, which reflect or absorb the energy created. Such materials must be properly installed around the source of the interference and maintained in proper working condition in order for the shielding to be effective. In addition, shielding can also be passive or active, meaning that it either passively blocks out signals or actively blocks signals and re-emits them in another direction.

In addition to shielding material, there are also materials specifically designed to absorb energy in order to reduce or mitigate defects caused by intermodulation. An example of such a material is damping compound, which is a type of polymeric substance that absorbs EM energy due to its physical structure. Damping compound works by altering the transmission paths of EM energy and reducing the energy\'s effect on circuits. This material is usually recommended when shielding is not possible or not convenient.

The use of shielding and absorbing materials is essential in order to reduce the impact of RFI and EMI on electrical and electronic devices. Although there are numerous products and techniques available for this purpose, proper design and installation is still required. Additionally, all materials used must be correctly maintained in order for them to be effective.

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