5G Millimeter Wave Phased Array Research

Because of its advantages such as precise beam pointing,high combined gain,and easy beam forming,large-scale phased arrays have become one of the key technologies for5 G millimeter-wave communication.This thesis focuses on 5G millimeter-wave phased arrays,involving three different antenna forms,including electromagnetic dipole antenna(ME),dielectric resonator antenna(DRA)and waveguide slot antenna.The main research contents are as follows:1.Research on ME phased array: A dual-polarized slot-coupled ME is designed.Metallized vias are used to construct cavity structures in the medium of the feed layer and the radiant layer,respectively,to improve the coupling efficiency of the stripline feeder and the isolation of the elements in the array.The 5 × 5 phased array is further designed,and the simulation results show good scanning performance?2.Research on DRA phased array: The effects of different feeding methods of DRA on antenna performance and the decoupling methods in the array are studied.According to the index,a dual-polarized DRA phased array antenna covering 27.9GHz ? 31.1GHz is designed.A combination of conformal metal strips and slot-coupled feed is used to achieve dual-polarization excitation.In addition,the grid is constructed by a metal partition in the array to isolate the elements.Simulation results show that the array can scan within ± 30 °in azimuth and ± 20 ° in elevation,and the reduction of scanning gain is less than 1.6 dB.3.Research on single ridge waveguide phased array: Two 8 × 8 phased arrays are designed with ridge waveguide to achieve horizontal and vertical polarization radiation performance respectively.The horizontally polarized radiation is achieved by opening longitudinal slits on the wide sides of the ridge waveguide,and the vertically polarized radiation is achieved by opening "V-shaped" slits on the ridge edges of the waveguide.In order to solve the conversion loss caused by coaxial feeding,the feeding structure of the array is improved.A version of an all-metal array is fabricated,and the measurement results show that |S11| ?-10 dB within 26.5GHz ? 29.5GHz.The single-port pattern is consistent with the simulation results.