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. When it comes to knowledge about electromagnetic shielding, what do we need to understand? Is electromagnetic shielding simply a matter of building an iron box and grounding it to create an electromagnetic shielding room? What should we pay attention to? This time, electromagnetic shielding equipment manufacturer Hengli Shielding informs you about 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.

The true factors affecting the shielding effectiveness of a shielding body are only two: one is that the entire surface of the shielding body must be conductive and continuous, and the other is that conductors cannot directly penetrate the shielding body. There are many non-conductive discontinuities on the shielding body, with the most significant being non-conductive gaps formed at the junctions of different parts of the shielding body.

These non-conductive gaps produce 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 cracks of a fluid container with rubber. This elastic conductive filling material is known as an electromagnetic seal pad. Many literature pieces liken electromagnetic shielding bodies to liquid-tight containers, suggesting that only when gaps are sealed completely with conductive elastic materials can electromagnetic wave leakage be prevented.

Actually, that is not precise. Whether gaps or holes leak electromagnetic waves depends on their size relative to the wavelength of the electromagnetic waves. No significant leakage occurs when the wavelength is much larger than the opening size.

For more information on electromagnetic shielding, please visit our website. If you wish to purchase electromagnetic shielding equipment, please call our electromagnetic shielding room manufacturer, Hengli Shielding.