Electromagnetic Interference

What is Electromagnetic Interference (EMI)?

Electromagnetic Interference is unwanted interference caused in an electrical path or electrical device due to an external source. Electromagnetic Interference causes degradation in the performance of electrical devices. EMI is the coupling of signals from one system to another. This external source can be both natural and man-made source. Electromagnetic Interference is also known as Radio frequency interference. Electromagnetic Interference is caused in an electrical circuit when an electric current is disrupted by an external source. This usually occurs when the electronic device is exposed to the electromagnetic field , also because of electricity and magnetism it occurs. It is a transient disturbance which occurs at the place where source emits the short duration of pulse energy ....

Cause and Effect of Electromagnetic Interference

There are some list of Cause and Effect of Electromagnetic Interference given below :...

Classification of Electromagnetic Interference

There are different types of Electromagnetic Interference based on the sources from which is generated. Some of its types are:...

Characteristics of Electromagnetic Interference

EMI usually come from high-power radio, electrical sources. Even mobile phone, which we use regularly is also one of the source of EMI. EMI occurs when received energy causes the receptor to act in abnormal manner. It is one of the reason of poor performance of electrical devices. Electromagnetic Interference is classified into further types on the basis of transmittance and devices in which it occurs. Electromagnetic Interference causes unwanted noise inside devices or sometimes causes malfunctioning of system. The transfer of energy between different system occur through radiation and conduction. EMI is the result of electromagnetic emissions. There are three elements involved in EMI which are source, coupling medium and receiver. Source is the emitter part, and receiver is the victim part. So this replaces the current and then radiates the RF spectrum respectively....

EMI Coupling Mechanisms

The EMI can be coupled from source to receiver in different ways. EMI coupling mechanisms describe the way EMI travels from source to receiver or victim device. The coupling path differs in each EMI coupling mechanism, and it is important to understand EMI traveling paths. Electromagnetic disturbances are transmitted from source to the receiver/victim through a variety of means, such as a common conducting path, mutual inductance or capacitance, or air or vacuum. EMI coupling mechanism can classified into four types, i.e.,...

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....

Techniques to Control Electromagnetic Interference

There are some technique available to reduce the effect of EMI or for controlling EMI. Some of them are:...

Advantages and Disadvantages of Electromagnetic Interference

There are some list of Advantages and disadvantages of Electromagnetic Interference given below :...

Applications of Electromagnetic Interference

EMI has various application in security , medical , aerospace industry and in vehicular control system. Some of its application are listed below :...

Conclusion

From above discussion it is concluded that EMI is threat to human development. It is necessary to prevent unnecessary occurrence of unwanted noise as it can cause loss of signal, malfunction of device, changed behavior of devices. The best way to prevent EMI is to use good quality electronics equipment. EMI Shielding in electronic devices and equipment is the use of manufacturing techniques and materials to protect signals from being disrupted by external electromagnetic signals as well as preventing generated signals from interfering with surrounding components. There are three techniques of controlling Electromagnetic Interference grounding, shielding and filtering. Electromagnetic shielding is one of most famous method for reducing the effect of EMI and thus stops the phenomenon that results into the radiation of electrical signals into the places which there presence is undesirable....

FAQs on Electromagnetic Interference

How does EMI occur ?...