Achieving High Gain Performance for 5G Millimeter-Wave Transmission with Large Communication Transmission Loss

Millimeter wave has become a research hotspot due to its rich spectrum resources, and the deployment of 5G millimeter- wave has been put on the agenda recently. Substrate integrated waveguide (SIW) is often used for the high frequency transmission because of its advantages of low loss, small size, ease of integration. This work addresses the problems of millimeter-wave transmission with large communication transmission loss, susceptibility to water and oxygen absorption, and reduced signal coverage after increasing gain. Broadband high-gain SIW millimeter-wave antenna that meets the requirements of “Global Communications” and multi-beam antenna that realizes spatial scanning have been investigated in this study. In order to deal with the defect of high transmission loss in millimeter-wave communication, a SIW slot coupling microstrip patch antenna is designed in this paper. Besides, to solve the problem that the single antenna cannot meet the higher gain requirements in terminal applications, a four-way power divider network has been designed for the array. Through simulation, the array realized the peak gain of 13.21 dBi. Finally, in order to solve the problem that the signal coverage decreases with the increase of the gain, the double-layer 4×4 Butler matrix beamforming network designed from the single-aperture and the double-aperture cross coupler were designed successively.