Description

With the widespread use of technology and the rapid growth of electronic devices, the issue of protection against electromagnetic waves is raised. For most people, even a day without contact with electronic devices such as laptops, tablets, mobile phones, etc. is impossible. All these electronic devices emit electromagnetic waves and these electromagnetic radiations can be harmful to the body. The disadvantages of electromagnetic waves for the body are shown in the opposite figure. Children, pregnant women, and immunocompromised people are among the high-risk groups that are more vulnerable. According to medical research, excessive exposure of pregnant women to electromagnetic waves causes irreparable damage, such as increasing the risk of miscarriage. Therefore, pregnant women should avoid electronic devices. Electromagnetic waves in children’s bodies cause problems such as fatigue, depression, memory loss, digestive system function loss, headache, anxiety and aggression, nausea and etc. due to their weak immune and nervous systems. For this reason, today the need for tools that can protect humans from electromagnetic waves is strongly felt. Electromagnetic (EM) shielding products include EM shielding pregnancy clothes, EM shielding paint, laptop pads, modem covers, EM shielding wallpaper and etc.

 

Another application of electromagnetic shielding is EM shielding walls, which are used to protect a place from electromagnetic waves. The function of these protectors is to prevent damage to sensitive electronic data due to electromagnetic interference and also to protect human health. In fact, the effective operation of electrical tools is interrupted, destroyed or limited due to electromagnetic interference. In short, electromagnetic shielding is a process to reduce the scattering of electromagnetic waves in the intended space by blocking the waves with a shield made of conductive materials. In a material, the main mechanisms for weakening the interference of electromagnetic waves are reflection, absorption and multiple reflections. Reflection is the primary shielding mechanism of electromagnetics. To be reflective, the material must have mobile charge carriers, such as electrons or holes, that interact with electromagnetic radiation. The second mechanism for electromagnetic shielding is absorption, which requires the presence of electric or magnetic dipoles to interact with electromagnetic radiation. Materials with high dielectric constant, electric dipoles and materials with high magnetic permeability create magnetic dipoles to protect electromagnetic waves by absorption process. The third mechanism is multiple reflections, which is the reflection on different surfaces of the material. Materials with specific internal surfaces or composites with dispersed particles exhibit multiple reflection mechanisms. Shielding effectiveness, expressed in decibels, is the sum of reflection loss, absorption reduction, and multiple reflections (figure opposite).

 

Metals are the most common material for electromagnetic shielding because they are conductors because the free electrons in metals interact with electromagnetic waves. However, conductivity is not a requirement for shielding electromagnetic waves. The most common materials used for electromagnetic shielding are metals such as copper, aluminum, and stainless steel. As these metals provide sufficient protection against waves, their susceptibility to corrosion, bulkiness and difficulty in forming the required shape create problems. Carbon material has been considered as an electromagnetic shield to solve the problems caused by the use of electronic devices. Carbon materials are highly stable, and their electronic properties, high surface area, and thermal stability have led them to be suitable choices for electromagnetic shielding applications. Carbon materials commonly used for electromagnetic shielding include carbon fiber, carbon nanotubes, graphene, graphite powders, carbon black, and carbon filaments. Graphene is a two-dimensional layer of carbon atoms arranged in a honeycomb lattice. Electrons in graphene behave like massless particles that contribute to high electron mobility. Protective products made on the basis of graphene include EM shielding paint, EM shielding spray, EM shielding coating, etc., which can be used to protect the walls of data centers, children’s rooms, etc.

 

KPA company operates in the field of electromagnetic shield production and offers customers a variety of products with the best quality and price.

   To place an order and if you need advice and to inquire about the price of the electromagnetic shield, you can enter the (contact us) page and contact our experts.

https://graphenika.com/contact/

   Also, see the following page for more information on the use of electromagnetic shields.

https://graphenika.com/portfolio/protection-against-electromagnetic-waves/