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...