Why do we need shielding design when designing EMC?
EMC is a capability of equipment. It requires that the equipment can normally perform its functions in its electromagnetic environment without affecting its normal work due to environmental interference. The EMC performance of a product is directly related to the product's working stability and environmental adaptability. EMC design is an indispensable and important part in the design of communication products. The more critical item in EMC design is the shielding design of the equipment.
Shielding can effectively suppress electromagnetic interference transmitted through space. There are two purposes for shielding: one is to restrict the internal radiated electromagnetic energy from passing through a certain area; the other is to prevent external radiation from entering a certain area. The existing shielding measures are implemented based on these two purposes.
At present, the shielding system has been recognized by more and more users, and its good performance in electromagnetic compatibility is also being recognized by more and more people. The shielding system has good electromagnetic compatibility and can provide a safe, high-speed, and stable information transmission channel. The shielding system has a complete shielding and grounding system, providing the most complete and comprehensive cable, components and end-to-end full shielding solutions to meet the increasing demands of today's networks. For the shielding system, grounding is a crucial process. Only when it is properly and effectively grounded can the superiority and value of shielding be reflected.
Application of shielding system
1. Information security: Improving the security of information transmission and ensuring that sensitive data is not leaked is one of the most important reasons for choosing a shielding system. With the popularization of network informatization, the importance of information security has been more and more valued by users. Preventing information leakage has become a crucial issue.
2. High-speed networks: Compared to 100M and 1000M networks, high-speed networks are more sensitive to external interference due to more complicated coding and other reasons, and communication is more susceptible to external interference. For the shielding system, the shielding layer shields not only the external electromagnetic interference, but also the interference between cables. The influence of the shielding wiring system on ANEXT has inherent technical advantages, so the shielding system operates at a relatively high speed. More stable and reliable.
3． Special transmission environment: The special installation environment needs to protect the external electromagnetic interference. For example, there are strong radio frequency sources such as radio and television stations near the building, or near large power plants, or various industrial environments. These environments all have strong electromagnetic interference that is clearly present in continuous or intermittent operation. Before the implementation of the wiring system, although the impact of these interferences on network operation was difficult to quantitatively analyze, the use of shielding systems can better ensure the normal operation of network communications.
Screen design
1. Shielded room: It can provide a low-level and stable environment, which brings greater benefits to the improvement of measurement accuracy, measurement reliability and repeatability. However, the interference signal generated by the device under test in the shielded room generates irregular diffuse reflections through the 6 faces of the shielded room, especially in radiation emission measurement and radiation sensitive measurement, which causes a huge error in the shielded room.
2. Mixed wave chamber: A rotating large metal reflector is placed in a rectangular parallelepiped shielded room to achieve a uniform field environment. So the electromagnetic field at a certain point in the chirped wave room is the vector sum of reflected waves from various directions at this point. In addition, the rotation of the fan blades changes the path length of the electromagnetic wave to reach this point and the number of wave reflections. Statistically speaking, the field in the cavity will not have a significant resonant field structure, and finally a statistically uniform, well-recognized, permissive field environment will be obtained in the test area of the cavity.
3． Transverse electromagnetic chamber: consists of three parts: the main section, the transition section, and the rectangular coaxial connection line. The transverse electromagnetic chamber converts the input energy into a uniform magnetic field, thereby eliminating the problem of uneven growth that may be caused by the use of antennas. At the same time, the ground partition of the GTEM chamber and the gradual waveguide wall are matched and connected at the terminal, thus eliminating the reflection and resonance phenomena inherent in other equipment.
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