Electromagnetic waves are the main mode of propagation for electromagnetic shielding equipment. During operation, adjacent equipment can also be affected by interference because the function of electromagnetic shielding is to cut off the propagation path of electromagnetic waves, thereby eliminating interference. When dealing with interference issues, shielding devices are commonly used Good choice!
Classification of electromagnetic shielding machine rooms
1. Classified by purpose: Shielded rooms can be divided into the following four categories based on their purpose
Type 1: Block the diffusion of indoor electromagnetic radiation to the outside world. Used to suppress the interference of radio equipment and radio frequency equipment to the outside world, in order to reduce the interference hazards of radio equipment and radio frequency equipment to other nearby radio equipment, instruments, etc; At the same time, ensure that the interference level in free space remains below the allowable level, thereby achieving the goal of space radio wave management.
Category 2: Isolate external electromagnetic interference to ensure the normal operation of indoor electronic and electrical equipment. Especially in the measurement and testing of electronic components and electrical equipment, the use of electromagnetic shielding rooms (or darkrooms) to simulate ideal electromagnetic environments can prevent interference from external electromagnetic fields in the operation of radio equipment, instruments, and meters, ensuring the normal debugging of low-level equipment, calibration of measuring instruments, and improving the accuracy of detection results. Efficient operation of highly sensitive wireless and electronic devices, providing a reliable place without electromagnetic interference.
The third category: preventing information leakage from electronic communication devices and ensuring information security. In order to protect national secrets and prevent signals leaked from radio equipment from being "eavesdropped" by the enemy, it is necessary to use a shielded room to achieve the purpose of leak prevention. Electronic communication signals will propagate to the outside world in the form of electromagnetic radiation, and the enemy can intercept and restore them using monitoring equipment. Electromagnetic shielding room is an effective measure to ensure information security.
The fourth category: In recent years, due to the widespread use of high-power RF equipment, RF near-field protection has become particularly prominent. Shielding rooms have become an important measure to suppress high-intensity electromagnetic radiation, prevent the harm and impact of RF equipment on workers, and prevent environmental pollution. For more information on the construction of electromagnetic shielding machine rooms, please consult.
When the frequency is low, the absorption loss is very small, and the reflection loss is the main mechanism of shielding effectiveness. It is necessary to maximize the reflection loss as much as possible; Reflection loss is related to the characteristics of the radiation source, and for electric field radiation sources, reflection loss is significant; For magnetic field radiation sources, the reflection loss is very small. Therefore, the shielding of magnetic field radiation sources mainly relies on the absorption loss of materials, and materials with higher magnetic permeability should be selected as shielding materials.
The above is the introduction of relevant knowledge about electromagnetic shielding room that the editor will share with you. We hope it will be helpful to everyone! The wave impedance of electric field waves decreases with increasing propagation distance, while the wave impedance of magnetic field waves increases with increasing propagation distance. If you have any questions, please consult us specifically!
