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RFI and EMI - Shielding and Absorbing Materials

Radio Frequency Interference (RFI) and Electromagnetic Interference (EMI) are two types of disturbances that can cause interference in electronic equipment. RFI is caused by radiating antennae and EMI is typically caused by power lines, arc welders, generators, motors, and other high-power devices. Both of these types of interference can be very damaging to sensitive electronic equipment. Therefore, it is important to use effective shielding and absorbing materials to protect the equipment from these disturbances.

The most commonly used materials for shielding and absorbing RFI and EMI are metallic materials. These materials absorb and dissipate the energy of the interference waves, so that only a small amount is allowed to reach the equipment. Some of the most effective materials are copper, aluminum, steel, and tin alloys. Paints and plating can also be used for this purpose, as they can help to reflect the waves back away from the equipment.

Aside from shielding and absorbing materials, there are also a number of other techniques that can be used to protect sensitive equipment from RFI and EMI. Some of these methods involve using antennas to help deflect away signals from potential sources of interference. Antennae can also be tuned to detect the more powerful interference signals, allowing them to be attenuated or blocked. There are also filters that are designed to remove certain types of noise from the circuit. Finally, some components can be designed to prevent RFI and EMI from entering the equipment.

In summary, RFI and EMI are two common types of interference that can potentially cause harm to sensitive electronic equipment. To protect this equipment, it is important to use effective shielding and absorbing materials to reduce the amount of these interference waves that enter the equipment. There are also a number of other methods that can be used to reduce interference, such as antennas, filters, and components that are designed to prevent RFI and EMI from entering the equipment.

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