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What is a shielding frame or shield? What does it consist of?
Release time:
2022-01-10 13:38
Key words:
The shielding frame and shield are tools for electronic signals. The function is to prevent the impact of external electromagnetic waves on internal control circuits and the radiation of electromagnetic waves generated by internal management in the enterprise.
The shielding frame and cover are composed of legs and covers, which are movably connected. The lid is tubular in shape. This component is mainly used for mobile phones, global positioning systems, etc. to prevent electromagnetic interference, PCB board components, and LCM shielding.
The material of the shielding frame and cover is generally 0.2mm thick stainless steel and Yang Baidong, among which Yang Baidong is a well filled metal shielding material.
The tray where the shielding cover is placed has too much space for movement, making it easy for the patch to shake and absorb when shaking. The material should be placed in the tray with about 1.0 millimeters of space for movement. If it is too large, the material may shake, and it is too small to remove the material.
The size of the pickup point for the shielding cover should be moderate, and the pickup point should be as close as possible to the middle of the material, with a size of 6.0mm. The larger the pickup point, the higher the stability and efficiency of the patch.
Magnetic shielding materials are used to shield magnetic fields. Magnetic shielding can be divided into three situations: static magnetic shielding, low-frequency electromagnetic shielding, and high-frequency electromagnetic shielding.
Static magnetic shielding: In order to concentrate stray magnetic fields on the shielding shell, the development of shielding technology can achieve the highest possible investment rate. All high magnetic soft magnetic materials, such as electromagnetic pure iron, ductile iron, foam alloy, silicon steel, soft magnetic ferrite, can be selected in principle. The design should be selected based on comprehensive considerations such as screen requirements, price, shell strength, and processing performance.
Low frequency electromagnetic shielding: In addition to static magnetic shielding, it is also necessary to shield the changing electromagnetic field. Power frequency electromagnetic fields, etc. In addition to high investment rates, high conductivity is also required. The ideal living material is foam alloy. Considering the market price and processing technology factors, large shielding is suitable for electromagnetic pure iron. When the foam alloy contains more than 40% nickel, the conductivity and conductivity are very good.
High frequency electromagnetic shielding: The principle of shielding with the main purpose of electromagnetic shielding is to use the shielded supervisory electromagnetic field to counteract external electromagnetic interference according to Rentz's law. Good conductors such as aluminum and copper should be used to manufacture shielding.
Shielding is a device method in electrical engineering. To prevent interference from external electric fields, magnetic fields, or electromagnetic fields on internal equipment, or to prevent the impact of equipment electromagnetic fields on the external world. Place the device on a sealed or nearly closed metal casing or metal mesh cover. This metal shell or mesh cover is called a shield. In structural chemistry, borrowing the term 'shielding' to name has the following teaching effects. Because inner electronic technology is equivalent to "shielding" a portion of the nuclear power plant charge, it can be referred to as shielding effect. The magnitude of the shielding effect between electrons can be roughly represented by the shielding coefficient.
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