EMI and its Effects

Electromagnetic interference—commonly know as EMI—is the disruption of electronic operations and electronic devices electronic from emissions. EMI travels in waves, and has the capacity to interrupt electronic operations and communications across a wide berth of industries. These interruptions cause devices to malfunction, which can yield very dangerous results. To limit the effects of EMI, shielding gaskets can be used to surround a material that emits electromagnetic radiation waves. Almost all electronic components emit EMI, from a simple television remote to a complex space rover, and so they must be shielded from unwanted interruption. It is vital to thoroughly shield all electronic components, in order to mitigate the ill effects of EMI.

Interference is commonly found in older radio technologies that are not thoroughly shielded. It is common to hear disturbances in AM radios and analogue amplitude modulation. These devices cannot filter out unwanted in-band signals. Newer systems are designed to be more selective, and can block certain signals while accepting others. This quality helps improve overall levels of resistance to EMI.

In 1982 the United States passed a law allowing the Federal Communications Commission to regulate the EMI emissions from consumer devices. Toaster ovens, remote controls, heating pads, and all common electric goods were all subject to tighter emission regulations. Most countries have legal requirements that mandate the quantity of emission from devices, so that they do not interfere with other equipment. The best way to shield household items is with different types of shielding gaskets.  There are currently international standards for radio emission that are governed by the International Special Committee for Radio Interference (CISPR).  This organization is comprised of an international committee tasked with monitoring international EMI emissions. The International Electrotechnical Commissions sets worldwide standards for radiated emission across domestic, commercial and industrial sectors.

The space and military sectors are highly concerned with shielding components from EMI. If large enough, EMI emissions can blow up circuits and block antenna signals. In this sector, communications are vital for keeping people alive. If an EMI emission blocked a signal during a satellite launch or military operation, it could end in catastrophic failure and loss of lives. Shielding Gaskets are designed with opening and apertures that provide ventilation to the component, but do not allow emissions to escape into the environment. Most materials used for EMI are metal, and have come in a wide variety of electrical conductivity, permeability, and shapes.

For more information on EMI, its effects, and shielding gaskets, it is best to contact a local manufacture of shielding material.

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