Array Antenna Design And Pattern Synthesis

Array antenna design flexibility,high degrees of freedom,easy to achieve high gain,combined with the direction map integrated technology,beam explanating,so that the array antenna can radiate low sidelobes,residual cutting beam,flat top beam and other specific direction maps,in wireless communication,radar measurement and control system has a wide range of applications.Based on the basic principles of array antenna design and direction map synthesis,this paper studies the method of high-gain millimeter-wave multibeam array antenna based on Rotman lens and the direction map synthesis of string feed array antenna with the goal of multi-beam and beam explanating.1.The design of multi-beam high-gain array antenna based on Rotman lens is studied.Rotman lens is a passive multibeam formation network based on quasi-optical principle,which has the advantages of low latency,easy co-form and simple design.By analyzing the design equation and working principle of Rotman lens,the contour curve and port shape of the traditional Rotman lens network are optimized and improved.A microstrip Rotman lens with a working center frequency of 26.4GHz is designed,the output phase of the lens is more stable,the insertion loss is reduced and performance is improved Isolation,for the antenna array part,the design of bipolar circular microstrip antenna array by coaxial dual feed,combined with parasitic technology to increase antenna operating bandwidth,the configuration of 256 units to achieve the high gain of antenna array,and finally,combined with multi-layer plate pressing technology,the improved Rotman lens,ribbon power subnetwork,double-layer microstrip antenna array arranged together in turn,between layers connected by metallic through holes,completed the low profile,high gain,integrated millimeter wave three-beam array antenna processing and testing,through comparison,test and simulation results are basically consistent.The antenna is a bipolar high-gain multibeam antenna,operating in the millimeter wave band,each polarization of 3 input ports,respectively,can achieve-30,0,30 degrees of fixed beam scanning,antenna gain greater than 25 d Bi,port matching performance is good,voltage station wave ratio is less than 1.5.2.The direction map comprehensive technology of serial feed antenna array is studied.First of all,combined with the working principle and design process of the string feed antenna,by extracting the conductivity values of the cells in the array of the unit and the sub-array,considering the influence of the intercoupling and discontinuity of the microstrip transmission lines between the arrays,accurately extracting the conductivity values of the patch unit,and obtaining the fitted conductivity function curve,which is the basis for array design and beam assignment.Secondly,the traditional beam excision algorithm such as GA,PSO,DE and other intelligent search algorithms against a large number of arrays of metaassignment,low efficiency,accuracy is not high,in order to solve this problem,we combine the theory of array antenna,improve the FFT algorithm,using the improved algorithm to accurately and efficiently calculate the 32-unit string feed antenna residual direction map beam assignment,get the amplitude phase distribution of the unit excitation,and then can determine the unit's conductivity distribution and position distribution.Finally,in the fullwave modeling and simulation of the 32-unit string-feed array,by increasing the near-field coupling line,the caliber field distribution(range and phase)of the array antenna is extracted,so that the actual caliber field distribution of the string-feed array is constantly approaching the array excitation distribution curve optimized after the MATLAB direction map is integrated,until the far-field direction map assignment effect meets the design index,and finally the design completes a 32-ring string feed antenna array that works in the C-band.".