According to the 5G frequency band standard divided by the International Telecommunications Union (ITU), there are three 5G frequency bands, namely the low frequency band of 700MHz~3.8GHz, the middle frequency band of 3.8GHz~24GHz and the high frequency band of 24GHz~100GHz. Among them, my country uses low-frequency and medium-frequency bands, and a few European and American countries use high-frequency bands. When the mobile phone jammer in the examination room interferes with the 5G signal, it is aimed at the low frequency band and the middle frequency band of 5G to cover the interference signal. In the middle frequency band, our country allocates 4800 MHz~4960 MHz (abbreviation: 4.9G frequency band) to China Mobile China Radio and Television, then the question arises: Does the mobile phone jammer in the examination room include the 4.8G frequency band when it interferes with 5G signals?

To be honest, although most of the mobile phone jammers in the examination room can support signal interference in the 4.9G frequency band in the product manual, many of the mobile phone jammers in the examination room do not have the ability to interfere with the 4.9G frequency band in the actual products put into use. function. The reason is: 4800 MHz~4960 MHz is characterized by relatively high frequency, but serious signal transmission errors, and usually can only be used as indoor signal coverage. Compared with the low frequency band of 700MHz~2700MHz, or even the middle frequency band of 3.6G, the actual penetration rate and utilization rate of the 4.9G frequency band are very low. At present, only a few special places in China will use the 4.9G frequency band, and only It is used for private network communication. Therefore, as a manufacturer of mobile phone jammers in the examination room, knowing that the usage rate of the 4.9G frequency band is extremely low, and it is unlikely to deploy a mobile phone network with the 4.9G frequency band in a usage scenario like the school examination room, then give up Installing a 4.9G signal interference module will undoubtedly help reduce production costs.

Referring to the current development trend, even after two or three years, the 4.9G frequency band is still unlikely to be widely popularized and used in China. Even if the mobile phone jammers in the examination room do not have the jamming module of the 4.9 frequency band, there will be no incomplete 5G signal jamming during use, and customers basically don't have to worry too much about the impact of this problem.

Of course, if the customer clearly requires the manufacturer to install a signal jamming module in the 4.9G frequency band before purchasing the mobile phone jammer in the examination room, this is equivalent to making sufficient preparations for the future, maybe three or five years later, in case 4.9 With the widespread deployment of the G band, customers no longer need to consider product upgrades.