How an EMI Filter Works
Introduction Electromagnetic Interference (popularly known as EMI) can be defined as the interference caused due to the electric or magnetic field that affects (degrades or damages) the signal strength, the component, and the functionality of the electrical device. It encompasses RF (Radio Frequency) interference. EMI can be classified into two broad areas, namely Narrowband emission and Broadband emission. Narrowband emission is generally man-made whereas broadband emission may be either natural or man-made. As the name suggests, narrowband emission is only limited to a small area of the radio spectrum, while broadband emission affects a large area of the electromagnetic spectrum. Narrowband emission may be continuous or sporadic, whereas broadband emission is a one-time event that is random, sporadic, or continuous. Power lines generate hum sound (i.e., narrowband emission), while lightning strikes generate broadband emission. EMI Sources Electromagnetic inter...