Microstrip Antenna Array Design And Beamforming Researc

With the rapid development of mobile communication technology,people have increasingly high requirements for antenna performance.Antenna arrays have advantages over a single antenna such as high gain,strong directivity,and switchable radiation patterns.More antenna arrays will be deployed in future wireless communication systems.In the face of the current complex and variable forms of antenna arrays,traditional array beamforming methods are difficult to adapt to the diverse radiation pattern design requirements of today’s complex arrays,and there is an urgent need for an agile and efficient beamforming theoretical method.In order to solve the above problems,based on the method of maximum power transmission efficiency,this paper further implemented the polarization reconfigurable design method,null-steering method,and low sidelobe design method for antenna arrays.Based on these methods,three high-performance antenna arrays were designed for different scenarios.The research work of this article is divided into the following three parts:1.A compact polarized reconfigurable metasurface antenna array has been designed.The array element adopts a wideband high gain metasurface antenna with orthogonal double feed,which has a good directional radiation pattern.Using this antenna to form a 4-element linear array,the overall physical size of the array is reduced by 18.8% by sharing metasurface radiation elements without affecting its radiation performance.The optimal excitation distribution under arbitrary polarization mode is calculated using the method of maximum power transmission efficiency combined with the ideal power composite scattering matrix.The array is processed and measured,and the measured results maintain good consistency with the simulation results.2.The antenna array null-steering method based on the method of maximum power transmission efficiency is studied.In order to meet the specific radiation requirements of antenna arrays,theoretical formulas for narrow and wide nulling of antenna arrays are derived based on the extended method of maximum power transmission efficiency.An 8-element unequally spaced microstrip antenna array is further designed.,and based on this antenna array,experimental verification and analysis of narrow and wide nulling are carried out,respectively.The experimental results show that the antenna array designed by this method achieves better results in both narrow and wide nulling.3.A low sidelobe dual beams circularly polarized microstrip antenna array operating at5.8 GHz has been designed.The method of maximum power transmission efficiency is used to constrain the radiated power in the far field region of the antenna to achieve dual circularly polarized beams while reducing the sidelobe level.The feed network is designed based on the calculated optimal excitation distribution.The antenna array and feed network have been optimized and measured.The measured results show that the array achieves an equal gain dual circularly polarized beam at 5.8 GHz,with a gain of 13.0 dBic,and a sidelobe level below-20 dB.