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 test room cell phone signal jammer shields 5G signals, it covers the low-frequency and mid-frequency bands of 5G. 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 test room jammer include the 4.8G frequency band when shielding 5G signals?
To tell you the truth, although most of the test room jammers can support the signal shielding of the 4.9G frequency band in the product manual, many test room jammers do not have the function of shielding the 4.9G frequency band among the products actually put into use. . 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 test room jammers, 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 test room, then give up the installation The 4.9G signal shielding 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 those jammers do not have a shielding module for the 4.9 frequency band, there will be no incomplete shielding of the 5G signal 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 signal shielding in the 4.9G frequency band before purchasing the test room jammer