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The upcoming fifth-generation(5G)mobile communication with low-latency,high-speed and high-data-capacity[1]can real-ize innovative services such as remote intelligent medical care,smart cities,Internet of Vehicles,and ultra-high-definition video[2,3].Compared with current mobile communications,5G services require a 5G network with 1000 times the capacity and 10-100 times the data transmission rate[4].5G communication can also realize large-scale connections between people and machines[5].It will be the era of Internet of Everything.The realization of the interconnection of all things is essentially the communication between the transmitting antenna and the receiving antenna.