With the explosion of electronics, EMI/RFI Shielding has become crucial across many industries. The electronic devices that are present all around us generate some unwanted electromagnetic signals. These signals/waves are known as Electromagnetic interference (EMI) that can disrupt electronic devices, equipment, and systems that are used in critical applications. Since EMI-RFI create interfere with the operation of another electronic equipment present nearby, it’s necessary to control such radiation and conduction. To avoid disturbances caused by EMI-RFI, engineers need to recognize how electromagnetic energy can cause interference and find ways to minimize it.
To diminish the negative impact of EMI/RFI, design engineers use a technique known as EMI Shielding. It is a process in which the sources of undesirable electromagnetic energy are shielded and electrically grounded by blocking the fields with barriers. The EMI is produced due to man-made and natural sources. These waves can create temporary disturbances, data losses, as well as system failure. To avoid these harmful effects, EMI shielding is used in industries like medical, military, and aerospace electronics, and more.
Electromagnetic shielding limits the electromagnetic field in an area- both ingress and egress of electromagnetic energy by using a conductive, or magnetic, material. The RFI shielding involves blocking radiofrequency electromagnetic radiation. In the process, shielding agent is applied to the casings of electrical devices to prevent ingress and egress of EMI/RFI. Several different materials and techniques are used for EM shielding. Sprays, special conductive paints, and metallic foil are used to block EMI.
Benefits of EMI and RFI Shielding
EMI shielding is a feasible solution for reducing the electromagnetic field in space. This process involves minimizing the impact of EMI-RFI with the help of barriers or covers made of conductive or magnetic materials. There are various techniques for EMI shielding and the method used depends upon the type of shielding application. Typically, shielding material is applied on the enclosures to isolate electrical devices.
EMI shielding has multiple advantages as it reduces the unwanted transfer of energy. Shielding has become necessary to prevent the coupling of radio waves and electromagnetic fields. In cases where such coupling is undesirable, shielding helps in preventing the unwanted transfer of energy from one medium to another. Also, with the help of shielding, wires are isolated from the environment through which the cable runs.
When it is not possible to control EMI during the device designing stage, shields are manufactured to block radiofrequency electromagnetic radiation interference. The most common shielding materials are brass, tin-plated steel, nickel, silver, and stainless steel. Shields can be custom manufactured to meet your desired specifications. Depending on the requirement, the thickness, the size of the shielded volume, the frequency of the fields, as well as the size, shape, and orientation of apertures in a shield are determined.
The main advantage of using high-quality EMI and RFI shields is that it increases efficiency. EMI disturbance can obstruct, interrupt and degrade the performance of the circuit. The negative effects range from a simple degradation of data to more serious loss of the total data. Shielding provides an effective and efficient solution to this problem.