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A Brief Analysis Of EMI Shielding

By Ronald Cook


Electricity is certainly a crucial topic in education. EMI shielding, an important education concept, only gets covered minutely in many syllabuses. With a myriad of practical applications centered on it, the only time it gets fully covered during the course of study is when one enrolls as an undergraduate for a science based course.

Electromagnetic waves are predominantly present in the air, especially in areas with communication masts. When in the air, they often interfere with the correct operation of certain types of equipment. This disturbance is what is often referred to as electromagnetic interference.

Some companies have a specialty in manufacturing shields that help lock out disruptive waves from equipment. Many technological products rely on this type of protection to function correctly. Among the areas that manufacturers like to keep an eye on is the transmission equipment for electronic media. These days, television cables come with shields that help prevent the possibility of interference through radiation.

Without protective measures, you would have a hard time viewing clear pictures on your TV. The medical sector is also heavily reliant on the technology. Medical machines always ought to stay shielded if mechanical failure that may cause deaths is to be avoided.

Metal is the main material used to shield circuits. It may come in the form of sheet metal, metal foam or a metal screen. In practice, the holes in a protective mesh ought to be smaller than the wavelength of the radiation it is supposed to counter. If this condition is not met, a considerable amount of disruptive energy may pass through, leading to the improper functioning of electronic equipment.

These days, almost all electronic products are enclosed in plastic. Whereas plastic can allow radiation to pass through, the ones used in electronics are usually coated with metallic ink on the inside. Nickel and copper are the most used metals for this purpose. To provide an even coating for conduction, they are usually broken down into small particles before being sprayed on the plastic.

Microwaves also rely on shields to function appropriately. A microwave usually has a protective screen on its door. The wavelength of its radiation is 12 centimeters. By considering the application of the Faraday law on the flow of electromagnetic waves, the radiation that a microwave generates is confined within its metallic encasing and protective screen while outside interference is locked out.

During the transmission of radio frequency, shielding technology enables companies to prevent the theft of data stored on chips. This is a common application in biometric passports. With cases of identity theft on the rise, this is undoubtedly a great innovation.

The loss of data is also a great concern when it comes to using computers. Intruders often target weakly protected computers while on the prowl for sensitive information. However, keyboard shields are known to prevent data from being passively emitted when keyed in using keyboards. As a result of the high price of implementing the technology, it is often confined to the military.

There are numerous firms that manufacture electromagnetic shields. They can be easily found online. With time, you should get a product that suits your business or home.




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