Fast transmission rate
● Millimeter wave
At present, the 300 MHz~3 GHz spectrum used in the first to fourth generations of wireless communications has the advantages of penetrability and wide coverage, but there is a very fatal disadvantage: the bandwidth is too narrow, and there are many wireless devices in the frequency band. , Spectrum allocation is about to dry up. In order to transmit large-capacity and high-rate data, only available spectrum can be found on 3 GHz. The oxygen absorption frequency band and the water vapor absorption frequency band in the millimeter wave spectrum (3 ~ 300 GHz) cannot be used for communication, so the millimeter wave frequency band has a total of 252 GHz bandwidth available. In fact, the millimeter wave of the 5G communication network is allocated in the spectrum of various countries. The frequency band is about 3~6 GHz, but it is enough to increase the data transmission rate by more than 10 times. (Again, the first four generations of commercial communication technologies are all crowded in the frequency spectrum below 3 GHz).