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EMI Shielding Effects: How to Solve Different Types of Disruptions in an Electrical System

Date Added: November 24, 2009 11:22:08 PM
Category: "E": EMI Shielding

Electromagnetic Interference or EMI is known to affect the proper functioning of a certain electronic system. With this fact, households and businesses are not exempted knowing that many rely upon the existence of electronic appliances. While there are protective shielding types made for the electrical component, there are still possibilities of acquiring disturbances. These ones are known as EMI shielding effects.

EMI shielding effects are actually produced because of the set-up of the EMI shield. The shield often has apertures or openings where disturbances may actually get inside the electronic system. The openings cannot be removed from the system however just to solve the effects since these are virtual to proper ventilation inside the gadget. And to some extent, the shield serves its own purpose for the gadget.

EMI shielding effect in low and high frequencies

Two of the most talked about shielding effects are high and low frequencies in the electrical system. These two results can be dealt with accordingly depending on the EMI shields used in the process. As for low frequencies, one must look for an EMI shield that has a soft magnetic material. This material will be important in order to form a protective layer for the system. High levels of permeability as well as thickness should also be thought of to solve low frequency effects of an EMI shield.

In order to solve high frequency EMI shielding effects, it is advised that a thinner conductor or shield material should be employed. These ones should also be lower in terms of permeability. Such a choice is founded on the fact that a less permeable material can result to better shielding since it induces the so-called eddy current on the protective layer.
EMI shielding effect in terms of conduction

When conductive EMI shielding effects are being considered, the use of a thinner protective layer is said to be highly favored in terms of power line frequencies. For magnetic absorption considerations however, thicker materials should be employed in the process of designing the EMI shield. Of course, it should always be taken note of that the use of magnetic materials in conductive shields will be highly appreciated.

But much more than considering the thickness or the thinness of the material, the overall design of the shield should be regarded. The design should primarily be made in such a way that the apertures will minimize the shielding effects. Current flow should always be thought of so that EMI will not cause damage to the entire system.


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