Design And Research Of Reconfigurable Array Antenna

In this paper,two design studies are carried out,the first is the design of fully polarized reconfigurable(dual-linear polarization and dual-circular polarization)planar reflectarray antenna and the second is theoretical research on ultra-wideband fully polarized reconfigurable electronically scanning array.Firstly,a 1-bit multi-polarization reconfigurable planar reflectarray antenna with large angle beam scanning capability is proposed and verified by experiments.A multi-polarization element with two PIN diodes is proposed.The element structure and bias circuit are optimized.The full-wave simulation results show that the reflective element has low amplitude loss and low cross polarization.By properly controlling the two PIN diodes,1-bit phase shift can be obtained in both dual-linear and dual-circular polarization.The reflectarray antenna is composed of 16×16 elements,and a subarray is composed of 2×2 elements.The elements of each subarray are arranged in a continuous orthogonal way to improve the circular polarization characteristics of the antenna.A field programmable gate array(FPGA)and digital control circuit independently control 512 PIN diodes on the antenna to achieve the antenna radiation mode reconfiguration.The gain was 22.73 d Bi and the aperture efficiency was 28.7%.The dual-linear and dual-circular polarization scanning beam can reach 60° in E plane and H plane.The measurement results show that the designed reflectarray antenna has multi-polarization reconfigurable and wide-angle beam scanning capability.This design can provide a candidate scheme for multi-functional mobile communication applications.Secondly,a new ultra-wideband fully polarized reconfigurable electronically scanning array is studied theoretically in this paper.The iterative convex optimization design method is used to optimize the array element position to obtain ultra-wideband(1-4 GHz)and wide-angle beam scan(-60° to 60°)characters,while ensuring lower sidelobe levels.In addition,the continuous rotation scheme is adopted to make the antennas arranged in order with a fashion of 0°,90°,180°,270°.And the fully polarized reconfigurable properties can be obtained by excitation compensation method.The designed array can realize the functions of ultra-wideband,full polarization reconfiguration and large angle beam scanning.In order to prove the feasibility of this method,the current source in FEKO is selected as the array element,and the simulation results show good expected characteristics.Finally,this paper puts forward two design research and development direction,provides a variety of design direction and application prospects.