5G mmWave has a high transmission speed, which can match or even replace optical fiber to achieve ultra-high-speed wireless transmission because of its high bandwidth characteristics. In addition, mmWave components are much smaller in size than microwave components, so the system can be miniaturized, lightweight, and integrated, which is more beneficial to realize 5G scenarios. At the same time, mmWave wireless transmission brings convenience to network construction in complex environments, realizes flexible networking and easy to maintain.