How is EMI transmitted ?
The source of EMI can be both natural and man-made. EMI can be transmitted through two main modes of action one is conducted means and other is radiated. Conducted types involve noise that passes through a conductor into or out of a device, while radiated noise is received or transmitted wirelessly. At lower frequency , unwanted noise travel through conducted means. At higher frequency noise travel through radiated means. Sometimes it is also possible that EMI occurred through radiated means appear to happen through conducted means.
Two Main Modes of EMI Transmission are:
- Conducted means of EMI
- Radiated Means of EM
Conducted means of EMI
Interference transferred from a source to a receiver along a direct path is called conducted EMI. Conducted EMI is caused by physical contact. This method requires a physical conduction between source and receiver so it transfers electromagnetic emissions to connected equipment. Common paths for conducted emissions include power cables and electrical interconnection cabling. Conducted EMI also occur through parasitic capacitance.
Radiated Means of EMI
Radiated EMI requires no physical contact. Radiated EMI travels through the air instead. These emissions happen when devices produce intentional or unintentional electromagnetic energy in the form of an electrical field. Damage from EMI-radiated emissions occurs through induction. Radiated emissions spread outward, sometimes traveling long distances. Depending on their proximity and severity, they can have unwanted impacts on receiving devices located within the vicinity. These electrical emissions can also interfere with the source device operation if they overwhelm the circuitry.
Electromagnetic Interference
Electromagnetic Interference(EMI) is the interference caused in an electrical path or electrical device due to an external source such as lightning, solar storms, and solar flares. Have you ever experienced some unwanted noise, while communicating through mobile phones? This unwanted noise is caused because of Electromagnetic Interference. In this article we are going to learn what is electromagnetic interference with Some Examples Next we will go through how it evolves, its effect, its properties of electromagnetic Interference, advantages and disadvantages of electromagnetic interference. So it is basically an unwanted noise in the electric circuit by an outside source.
Electromagnetic Interference is also called as radio frequency interference as it is also a subset of electrical noise on the EMI spectrum and it disrupts the radio frequency system.
Table of Content
- What is Electromagnetic Interference (EMI)?
- Cause and Effect
- Characteristics
- EMI Coupling Mechanisms
- How is EMI transmitted ?
- Techniques to Control EMI
- Advantages and Disadvantages
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