Investigations On 5G Millimeter Wave Terminal Antennas And Modules

With the rapid development of the mobile communication terminal industry,mobile phones are increasingly becoming one of the most indispensable smart devices in people's daily lives.The working frequency band of the 5G system is increasingly expanding to the millimeter wave band,which is one of the main differences between the 5G and the traditional 4G mobile communication.However,the realization of millimeter wave-based mobile communication is an unprecedented challenge,because compared with frequencies below 6 GHz,the signal attenuation characteristics related to propagation,atmospheric characteristics,and media in the millimeter wave band have become more serious.At the same time,there are many difficulties and challenges in the design of millimeter wave antennas and modules in mobile terminal application scenarios.This paper conducts research on 5G millimeter wave antennas and modules in mobile phone terminals.The main contents are as follows:Based on the principle of the transmission array antenna,a wave-transmitting structure is designed,which can be used to reduce the influence of the metal structure of the mobile phone on the end-fire antenna.The simulation results prove that the design can compensate the gain loss of the end-fire antenna in the end-fire direction,and can broaden the impedance bandwidth of the antenna to a certain extent.A broadband magneto-electric dipole antenna unit and a quasi-Yagi antenna unit are proposed.Based on these two antenna units,a broadside antenna module and an endfire antenna module are designed and implemented for mobile phone terminals.Different channel calibration schemes are studied,and finally the beam scanning characteristics of the antenna modules are measured in a microwave anechoic chamber.The measurement results show that the maximum beam scanning range of the broadside antenna module when the gain fluctuation < 3d B is about ±50°,and the main and sidelobe ratio > 9d B.Meanwhile,the maximum beam scanning range of the end-fire antenna module when the gain fluctuation < 3d B is about ±50°,and the main and sidelobe ratio > 10 d B,which shows that the experimental results are consistent with the simulation results.The overall size of the broadside antenna module is 34×42×1.86 mm,and the overall size of the end-fire antenna module is 23×21×0.65mmThe beam scanning capability of the end-fire antenna module in the mobile phone environment is verified in the far-field microwave anechoic chamber.The maximum beam scanning range when the gain fluctuation <3d B is about 45°.The scanning results are worse than that in the free space,but the overall performance is satisfactory.