Research On Base Station Antenna Design And Array Pattern Synthesis Algorithm

With the vigorous development of the information era,the communication technology is constantly innovating.In order to meet people's high-speed,large-capacity,and low-latency communication needs,the fifth-generation mobile communication system(5G)came into human's life.5G inherited the traditional carrier Modulation methods and multiple input multiple output(MIMO)technology,and played a role of a new infrastructure for carrying the Internet of Things and big data era,it will become an indispensable carrier in the construction of smart cities in the future.As an important part of the mobile communication system,the base station antenna is responsible for the transmission and reception of wireless signals between the base station and terminal equipment.The current commercial 5G base station antennas mainly work in the sub-6band,in order to overcome relatively high transmission loss and increasingly complex space in electromagnetic interference,the new generation of base station antennas uses massive MIMO technology and adaptive beam adjustment technology to enhance the commercial capabilities of 5G and provide a platform for the development of emerging industries.This thesis mainly studies the design of new base station antennas and the research of large-scale array beam synthesis algorithm.The specific work is as follows:1.Research on broadband dual-frequency base station antennas.First of all,for the traditional communication frequency band,a dual-polarized base station antenna unit with a working frequency band of 1.7-2.7 GHz is designed.It has the characteristics of compact structure,stable radiation pattern and high isolation.Based on the above units,by adding mouse ear-shaped branches and parasitic coatings,a broadband dual-frequency dual-polarized base station antenna cell covering 1.7 to 2.7 GHz and 3.4 to 3.6 GHz is further improved and designed,which has a high gain in the working frequency band.The advantages of stability and high isolation can meet the needs of 2/3/4 and 5G communication systems.2.The research and design of broadband antenna cell and array,based on the content of Chapter 1,keep the unit azimuth dimension unchanged,and realize broadband working characteristics by adding high-frequency branches inside the antenna radiation structure,and its working frequency band covers 1.55-3.3 GHz,the designed cell is formed into linear array.Simulation and measured results show that the array has a stable radiation pattern,high cross-polarization isolation,and stable gain in the working frequency band,which can meet the needs of base station communication.3.Research on large-scale array pattern synthesis algorithm.First,for the simplicity of the simulation structure,a T-shaped dipole antenna covering 3.4-3.6 GHz is designed,self-adaptive differential evolution(SADE)algorithm is used to fit the radiation pattern of the cell,and the approximation function is used as the cell factor.Then,the amplitude and phase of a linear array and planar array are optimized to design,and a specific array pattern is synthesized,the synthesized amplitude and phase distribution is substituted into the HFSS software for simulation.The comparison of the two results verifies the effectiveness of the algorithm.