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An Introductory Look At EMI Shielding

By Ronald Cook


Electricity is an important topic in education. However, basic education does not adequately cover the all important concept of EMI shielding. With many applications in industry, its theoretical bit is only fully covered in science oriented courses offered in higher learning.

An area that has a significant number of communication towers is bound to have vast amounts of electromagnetic waves in the air around it. These waves are scientifically known to interfere with the performance of electronics. When an electronic appliance malfunctions as a result of this, the causative effect is called electromagnetic interference.

To counter the effects of the radiation, some companies specialize in the manufacture of shields that keep the disruptive waves at bay. Many facets of modern technology hugely benefit from this. One important area that manufacturers focus on is the transmission of electronic media. Modern television cabling systems are designed to withstand the effects of this form of radiation.

Without protection, you would not be able to view clear pictures on your TV set. The application of the technology can also be felt in the medical industry. The machines used in hospitals ought to be shielded so as to prevent deaths due to mechanical failure.

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.

Nowadays, electronic appliances typically come enclosed in plastic. Despite the fact that plastic is permeable to radiation, plastic encased appliances have metallic coatings in their interiors. Most coatings are made using copper and nickel. For evenness and proper conduction, the metals are usually ground into small bits then sprayed on the encasing.

Another great application of the concept can be found in microwaves. Their doors have protective screens built around the window. Microwaves typically have wavelengths of 12 centimeters. By applying Faradays law, the protective screen and metal encasing in a microwave confines the dangerous rays within its enclosure and at the same time keeps interference out.

In radio wave transmission, the security and safety of data is of the essence. Many modern passports have biometric chips that store data and transmit it through radio waves. Since identity theft always posses a great concern for authorities, protective measures always ought to be put in place when manufacturing chips.

When it comes to the computing industry, data loss is always a major concern. Hackers like to target computers with lax security so as to gain access to crucial information. However, modern specifications include the provision of keyboard shields that can stop the passive emission of data entered using keyboards. Due to the prohibitive costs involved, this kind of protection is mostly found in military grade computers.

There are several companies that manufacture protective equipment. They mostly feature their innovations online. You should have an easy time finding a product that is suitable for your household or business.




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