In our work life, we can always see a strange and mysterious device on some occasions - signal blocker. The signal blocker is to implement the same frequency electromagnetic interference on the signal of the mobile communication network, so that the mobile phone in a certain range can not communicate normally, to stop the use of mobile phones and other radio equipment for communication purposes. So what signals can be shielded by the signal blocker, and whether the function of the signal blocker used in each place can be the same? Now for you to analyze the signal blocker can shield which signals.
From the technical principle, the signal blocker is for the upstream and downstream channels of the mobile phone system, using frequency doubling, frequency division, frequency hopping filtering and other technologies to analyze the required shielding frequency; A spherical shielding space is customized according to the power of the shield, and a shielding magnetic field is automatically formed within the specified range, so that mobile phones (including PHS, GSM, SCDMA, CDMA, etc.) fail in this space. When the shield is in the working state, it can make the mobile phone receiving and sending signal function fail within the specified range, and cannot dial out and dial in, so as to achieve the purpose of mandatory prohibition.
The signal blocker is divided into a variety of styles: one is divided according to the type of signal shielded, one is divided according to the power size, and the other is divided according to the appearance. The shielded signals can be divided into positioning signals (GPS/ Beidou, etc.), WIFI (2.4G/5.8G), UHF, VHF, 315, 433, 2G, 3G, 4G, 5G and other signal bands. This frequency band can be combined according to different needs and can be composed of different types of shielding.
Therefore, we can classify and summarize the signal shielded by the signal blocker according to the difference of the use place.
In recent years, in all kinds of examinations in various countries, the use of radio technology for cheating cases have occurred, seriously affecting the fairness and justice of the examination. The examination room is a place with a high level of confidentiality, so the frequency band of the shielding device is relatively high. Generally speaking, the signal shielding device in the examination room can effectively shield mobile phone 2G, 3G, 4G, 5G (including radio and television) signals, and wireless communication signals such as walkie-talkies. Bluetooth, 2.4G, 5.8GWifi wireless network signals and wireless invisible headphones grafted with mobile phones, bone conduction headphones and other cheating signals.
GPS can provide accurate geographic location, vehicle speed and accurate time information anywhere in the world and in near-Earth space. According to the actual situation, Location signal blockers can block including GPS (L1-L5) in the United States, GLONASS(L1-L3) in Russia, Europe's GALILEO(E1/E5A/E5B/E6/E5), China's Beidou (B1-B3), Japan's QZSS(L1/L2/L5/LEX) and India's IRNSS/NAVIC(L5/S) and other wireless positioning signals.
Home signal blocker is mainly for children addicted to mobile phones, generally only need to block WiFi (2.4G /5.8G) signal can be, you can also choose to block mobile phone signal according to the actual situation.
Prisons are also important places to maintain social stability. As a means of scientific and technological prevention, signal blockers have been widely used in prison management. Without interfering with other electronic devices of the prison, the prison signal blockers are centered on CDMA, GSM, DCS, PHS, 3G (CDMA2000/TD-SCDMA/WCDMA), 4G,5G, and industrial power supply components.
With the proliferation of mobile devices such as smartphones and tablets, frequent ringing, message beeping, and unauthorized network access during meetings not only interrupt the meeting process, but can also reveal sensitive information. In addition, strong signal interference may also affect the normal operation of other electronic equipment in the conference room, such as wireless microphones, projectors, etc. Therefore, the installation of conference room blockers to effectively shield mobile communication signals through physical means has become an important means to improve the quality of meetings and ensure information security. Conference room signal blocker mainly shields all GSM/DCS/CDMA/PHS/3G(TD-SCDMA/CDMA2000/WCDMA)/4G/5G mobile phone signals, WIFI wireless signals and 700MHz (broadcast 5G frequency), while not affecting daily work, can also be customized according to actual needs.
With the popularization of 5G technology and the integration of technologies such as the Internet of Things and big data, the demand for signal shielding will be more complex and diversified. In the future, the signal blocker will develop in a more intelligent and integrated direction, which can not only accurately shield specific frequency band signals, but also seamlessly connect with the intelligent management system to achieve remote control, automatic monitoring and fault warning functions, and further improve the efficiency and safety of the conference.
In general, as an important auxiliary tool in modern work and life, signal blockers are helping enterprises to create an efficient and safe environment without interference with their unique advantages. With the continuous progress of technology and changes in market demand, we have reason to believe that the future signal blockers will be more intelligent and efficient, and escort the development of society.
