A shielded chassis is a metal body made of conductive or magnetic materials, whose main function is to limit electromagnetic capabilities within a certain spatial range and suppress radiation interference. By processing conduction and radiation, the shielded chassis can provide an interference free testing environment for the tested wireless communication devices. In addition, it can also protect internal electronic components from external electromagnetic interference, ensuring the normal operation and stability of the equipment.
Working principle
The working principle of shielded chassis is mainly based on the principles of reflection and absorption:
- Reflection principle: The metal surface inside the chassis can reflect external electromagnetic waves, preventing them from propagating inside the box. By selecting appropriate metal materials and constructing the chassis shell, electromagnetic waves can be effectively reflected and prevented from entering or leaving.
- Absorption principle: The inner surface of the chassis may use absorbing or conductive materials to absorb the energy of electromagnetic waves, convert it into other forms of energy (such as thermal energy), and dissipate them. These absorbing materials can be magnetic materials, carbon materials, silicone rubber, etc. They can convert electromagnetic interference into thermal energy without reflection.
Materials and Applications
- Material selection: Shielded chassis are usually made of metal materials such as aluminum alloy, steel plate, etc. These materials not only have good conductivity, but also high mechanical strength and corrosion resistance. In addition, some chassis may also be coated with electromagnetic shielding materials internally or externally to enhance their shielding effectiveness.
- Application areas: Shielded chassis are widely used in multiple fields such as electronics, communication, military, medical, etc. In the field of electronics, it is commonly used to test the electromagnetic compatibility of electronic devices; In the field of communication, it is used to test equipment in the radio frequency band; In the military industry, shielded chassis can be used to protect confidential equipment from electromagnetic interference and monitoring; In the medical field, electronic components and sensors in medical equipment also need to operate accurately in an electromagnetic environment, and shielded enclosures provide a good electromagnetic environment for these devices.
precautions
- Shielding efficiency: Different types of shielded chassis have different shielding efficiencies and frequency ranges. When selecting a shielded chassis, it is necessary to choose according to specific usage scenarios and requirements.
- Usage: When using a shielded chassis, it is necessary to pay attention to the correct usage method to ensure that it effectively shields electromagnetic waves without affecting other devices. For example, it is advisable to avoid making holes or connecting unshielded cables on the chassis.
- Maintenance and upkeep: Regular maintenance and upkeep of the shielded chassis are also key to ensuring its long-term stable operation. This includes cleaning the surface of the chassis, checking if the cable connections are secure, etc.
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