Research And Design Of Broadband Dual Circular Polarization Array Antenna

This article combines specific engineering applications of low-orbit satellites and ground terminals,this article aims to study an array antenna with a transmitting frequency band of27?31GHz and a receiving frequency band of 17?21GHz,which can realize dual circular polarization and share the transmission and reception.Compared with traditional circularly polarized antennas,this antenna has the advantages of low cost,shared transmission and reception,simple structure,and bandwidth.The article first introduces the application of satellite communications in modern mobile communications,the technical indicators of circularly polarized antennas,and the research background and current status of circularly polarized antennas,and expounds the research significance and engineering value of this article.The second chapter introduces the working principle and types of circular polarizers and the theoretical basis of circular polarized waves.The third chapter mainly describes the design process and result analysis of the antenna described in this article.First,it explains the design of the diaphragm double circular polarizer based on the Ka-band,and conducts a detailed theoretical analysis and analysis of the diaphragm circular polarizer.Parameter research,on the basis of the above-mentioned design and simulation of the all-metal structure antenna unit,designed a dual circular polarization array antenna unit with a transmitting frequency band of 27?31GHz and a receiving frequency band of17?21GHz,obtained through optimized simulation The return loss is less than-15dB;the gain is about 26dB;the axial ratio is less than 5dB in the center direction of the antenna unit.In Chapter 4,a dielectric-filled dual circular polarization array antenna based on the Ka-band is designed.The dielectric-filled method is adopted to shorten the unit period of the antenna and solve the obvious problem of the all-metal structure of the antenna grating lobe.By continuously optimizing the antenna structure and adjusting the antenna parameters,an array antenna with a return los.