Research On Key Technology Of Antenna Inversion Design Based On Demand Driven

With the rapid development of wireless communication technology and the diversification of communication functions,users have increasingly strict requirements for antennas.The main manifestations are: 1.Users have increasingly high requirements for the electrical performance of the antenna.The antenna is developing towards highperformance directions such as ultra-wideband,multi band,multi-function,and special pattern shapes;2.The user’s requirements for the installation environment of the antenna are becoming stricter.Due to the miniaturization,integration,and other special requirements of wireless devices,antennas often need to be installed on special platforms.Such stringent design requirements pose a higher challenge to antenna designers.The traditional antenna design method is a forward search and trial and error process based on the designer’s prior knowledge.Facing the current stringent antenna design requirements,traditional forward design methods are inefficient and difficult to coordinate high electrical performance requirements with strict installation space requirements.Therefore,new antenna design methods are urgently needed.In this thesis,a demand driven antenna inversion design method is studied based on the embedded cavity platform antenna design.The main work of this thesis are as follows:1.The planar spectral method and spherical harmonic function expansion method are studied,and the transformation from the far field of the antenna to the planar and spherical near fields of the antenna is realized.The errors of the two far-near field transformation methods are analyzed by examples.2.The embedded cavity platform is equivalent to a short waveguide model,and its eigenmode is analyzed.3.A demand-driven antenna inversion design method is proposed.Based on the user’s requirement for antenna’s electrical performance,this method inverts the far-field requirement to the near-field of the antenna through the far-near field transformation,combines the mode information of the antenna installation platform,achieves the mode filtering,obtains the expected nearfield of the platform,and then synthesizes the basic structure of the antenna according to the mode field distribution conformal principle proposed in this thesis.This method combines the antenna electrical performance requirements with the information of the installation platform to improve the efficiency of antenna design.4.Based on the inversion design method proposed in this thesis,the UHF broadband omni-directional embedded cavity platform antenna and circularly polarized side-firing embedded cavity platform antenna are designed,processed and tested,and the validity of the method is verified.This thesis constructs a demand-driven inversion design method for embedded cavity platform antenna.Although the work is relatively shallow,it has been verified in the actual antenna design,which lays a good foundation for the future development of efficient and automated antenna inversion design methods.