With the rapid development of science and technology, shielding equipment has emerged as the times require. The signal shielding device installed in the school examination room is mainly used to prevent cheating; and the shielding cabinet is mainly used to prevent the leakage of confidential information generated by computers, network servers and communication electronic equipment during operation, etc. Wait. Of course, the emergence of shielding equipment is not only for these, but also for the needs of high-tech, such as electromagnetic shielding rooms, etc., which are still widely used. So today, let's briefly sort out the devices that can block signals.
Signal jammer - anti-cheating in the examination room, etc.
During the working process, the signal jammer scans from the low frequency band of the forward channel (the channel from the base station to the mobile phone) to the high frequency band at a certain speed, causing interference in the process of receiving signals from the mobile phone, so that the mobile phone cannot detect the normal signal sent from the base station. Therefore, it is impossible to establish a connection with the base station, showing a state of no signal and no service.
For example, when the mobile phone communicates with the base station, the signal jammer is like a troublemaker, deliberately making noise around you. The noise signal is so large that the mobile phone can't hear what the base station is saying, and the base station can't hear what the mobile phone says.
In fact, this is not to shield the mobile phone signal, but to bury the signal sent by the mobile phone in a large number of noise signals, so as to achieve the purpose of interference. At present, the wifi signal jammer developed and produced by Jammer mart are all frequency bands, which can interfere with all frequency bands of 2G/3G/4G/5G of the three operators, and can also block all WIFI signals and Bluetooth signals.
Simply put, signal jammers are built to interfere with the work of communication equipment. The device selects the frequency that the mobile phone works, so it cannot affect the mobile phone application according to the data signal received by the communication base station. If you want to prohibit the use of all normal functions on the mobile phone, you only need to install a mobile phone signal blocker, and the mobile phone will stop accepting calls and messages from special channels.
Shielding the cabinet - preventing the leakage of confidential information
Shielded cabinet is a kind of cabinet, also called electromagnetic shielded cabinet. The shielding cabinet can be used to place computers, which can prevent electromagnetic waves from harming people, effectively inhibit the leakage of computer electromagnetic information, and prevent external strong electromagnetic disturbances from affecting the normal operation of computers. An electromagnetic shielding cabinet is an electromagnetic shielding equipment. It includes a cabinet bottom, a top cover, a side wall, a frame, a spring sheet, an upper waveguide window, a lower waveguide window, a door knife, a filter, a shielding glass, a perspective shielding glass door, a back door, a waveguide, and an optical transceiver. frame composition.
Shielding cabinets are mainly used for:
Prevent the leakage of confidential information during the operation of computers, network servers and communication electronic equipment;
Prevent the above equipment from being interfered by external electromagnetic waves during operation and ensure its normal operation.
It is used in industries with high demand for secret levels such as government agencies, banks, securities, military, scientific research, etc.
Mobile phone signal shielding cabinet/box
Mobile phone signal shielding cabinets and shielding boxes have many commonalities. They are also shielding bodies of various shapes such as shells, plates, and sleeves made of conductive or magnetically conductive materials, which can limit the electromagnetic capability within a certain space to suppress radiation interference. The metal body to make the wireless communication device under test in a non-interference test environment. In electronic equipment manufacturing enterprises, shielding boxes are indispensable, and the shielding boxes required in each different field are different, such as: GPS shielding boxes, mobile phone signal shielding boxes, Bluetooth shielding boxes, mobile phone shielding boxes, etc. . Some large enterprises or high-security conference rooms also use mobile phone signal shielding cabinets, which are mainly used to place mobile phones uniformly, interfere with wireless signals, and prevent information leakage.