Electromagnetic shielding or electromagnetic shielding is the practice of surrounding electronics and cables with conductive or magnetic materials to protect against emissions of incoming or outgoing electromagnetic frequencies. This practice is made for various reasons. The most common purpose is to prevent electromagnetic interference (EMI) from affecting sensitive electronic devices.
In general, metallic mesh shields are used to protect one component inside a particular device from affecting another. For example, in a smartphone, a metallic shield protects the electronics from the cellular transmitter/receiver. Radiation shields in mobile phones also reduce the amount of radio frequency energy absorbed by the user.
Electromagnetic shielding is recommended to increase the safety of air-gapped systems. Traditionally, physical isolation and lack of external connectivity have been considered sufficient to ensure their security.
An electromagnetic wave consists of two components: an electric field and a magnetic field. In general, a wave is a state in which vibrations are transmitted. An electromagnetic wave transmits an electric field and a magnetic field through space by vibrations. The directions of the vibrations of the electric field and magnetic field are perpendicular to each other.
An electromagnetic wave shield reduces the energy of electromagnetic waves through reflection, absorption and multiple reflection of the waves. The shield, which reduces electromagnetic waves, prevents disturbances in sensitive equipment. In addition, electromagnetic waves not only go straight, but also diffract depending on the frequency, just like light. Accordingly, when using the shielding material, it is taken into account that the electromagnetic wave can be refracted around the shield and reach the part to be shielded.
The most advanced method is a standard measurement method for evaluating the properties of an electromagnetic wave shield. The transmission of an electromagnetic wave of a certain frequency within the shield is done by taking the electric field and magnetic field through the sample and measuring the level of attenuation caused by the passage through the sample. The measurement is made in the range of 10 to 10 thousand MHz, and the shielding ratios of the electric field and magnetic field corresponding to the frequency are clearly indicated.
Shielding performance is expressed in decibels. This value expresses the attenuation degree of the electromagnetic wave. The ratio between the intensity of the electric field before shielding and after shielding (attenuation) is expressed in logs.
Our organization also provides electromagnetic shield testing services with its trained and expert staff and advanced technological equipment, among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors.
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