What is Electromagnetic Shielding?

What is Electromagnetic Shielding? We all know what electromagnetic is—it's the generation of magnetic energy from electrical energy, also known as electromagnetic signals, which can be used to transmit information. So, what do we need to know about electromagnetic shielding? Is it just about creating an iron box and grounding it to make an electromagnetic shielding room? What should we pay attention to? This article, provided by the electromagnetic shielding room manufacturer, Hengli Shielding, delves into the knowledge of shielding.

Many people misunderstand the principle of electromagnetic shielding, believing that simply making a box out of metal and grounding it will suffice to provide electromagnetic shielding. Under this misconception, the result is often failure. Because, electromagnetic shielding has nothing to do with whether the shielding body is grounded or not.

Only two factors truly affect the shielding effectiveness of a shield: one is that the entire surface of the shield must be conductive and continuous, and the other is that conductors cannot penetrate the shield directly. There are many points of non-conductive discontinuity on the shield, with the most significant being gaps formed at the junctions between different parts of the shield.

These non-conductive gaps create electromagnetic leaks, much like fluids might leak through cracks in a container. One solution to this leakage is to fill the gaps with conductive elastic materials, eliminating non-conductive points. This is akin to filling the gaps in a fluid container with rubber. This elastic conductive filling material is known as an electromagnetic seal gasket. Many documents liken electromagnetic shielding to liquid-tight containers, suggesting that only when the gaps are sealed with conductive elastic materials to the point of being滴水-tight can electromagnetic wave leakage be prevented.

Actually, that's not precise. Whether a gap or hole leaks electromagnetic waves depends on the size of the gap or hole relative to the wavelength of the electromagnetic wave. When the wavelength is much larger than the size of the opening, there is no significant leakage.

For more information on electromagnetic shielding, please visit our website. If you're interested in purchasing electromagnetic shielding equipment, feel free to call our electromagnetic shielding room manufacturer, Hengli Shielding.