Electromagnetic interference

In this paper the main motive is to study the Electromagnetic Interference which is very prominent field in today´s life. Electromagnetic interference also called radio frequency interference (RFI) is a disturbance that affects an electrical circuit due to either electromagnetic conduction or electromagnetic radiation emitted from an external source. EMI problems have been increasing with the proliferation of mobile electronic systems, wireless communication systems, and computer networks. The electromagnetic spectrum is becoming increasingly crowded. After this the reasons are elaborated; why electromagnetic interference takes place and how it affects the system. The presence of electrical field contributes to the surrounding levels of electrical and electromagnetic noise and interference. The increasing demand and dependence on the use of electromagnetic transmission systems for information technology applications has enabled revolutionary communications capabilities to include cordless communication devices, wireless networking, and satellite communication systems. As the number of these devices increases, there is an increase in electromagnetic radiation within the segments of the electromagnetic spectrum in which these systems operate. These emissions have the potential to interfere with the normal operation of electronic communication links and systems. The electromagnetic energy disrupting the normal operation or function of electronic devices is known as environmental interference (El). The source of El can be categorized as environmental (naturally occurring), incidental or intentional. The effects of El can be significant regardless of their source, however, engineering design and other considerations that can be used to limit the impact and disruption of El on electronic, communication and information systems. As we are aware of the bad impacts of Electromagnetic Interference so main concentration will be on Negative Effects of EMI. In the end of this pa- - per different methods for reducing the EMI and selecting the best one will be discussed.