Design And Implementation Of Broadband High Precision GNSS Antenna

There are four types of satellite positioning systems in the world,namely the US global positioning system GPS,the European Galileo system GALLILEO,the Russian global navigation satellite system GLONASS,and the Chinese Beidou satellite positioning system.Therefore,it is necessary to develop a GNSS satellite system that meets the needs of many parties.Performance antenna.Based on the project GNSS navigation and positioning antenna design,this article designs two GNSS antennas.Because the microstrip antenna is convenient to design and easy to integrate,the design scheme uses a microstrip antenna for design.Frequency band,the second antenna uses a microstrip magnetic dipole antenna,the antenna is printed on the dielectric board,and a choke coil is added so that the antenna can cover the entire navigation frequency band.Simulation analysis shows that the antenna is in the full frequency band The axial ratio within the angular range of within ±90 ° is less than 3d B,which can achieve right-hand circular polarization in the upper half of the antenna.The main contents of this article include:The first part introduces the research background and the research on the miniaturization,wide band,anti-multipath effect ability,phase center stability and wide beam methods of GNSS navigation and positioning antennas at home and abroad.The second part analyzes the working principle of microstrip antennas,including the corresponding principles of miniaturization,wideband,anti-multipath effect,phase center stability,and wide beam methods for microstrip antennas;it also describes the magnetic couple The principle of complementarity of a polar antenna;the principles and design methods of various feed networks that the antenna can achieve circular polarization work are analyzed.In the third part,a laminated microstrip antenna is designed.The design principle and structural design are introduced in detail.After HFSS simulation analysis,the antenna can cover four navigation frequency bands.Wilkins power divider and phase shifter are used as the antenna.The feeding network of the antenna,four-point feeding,effectively suppresses cross polarization,and the antenna has a wide angle axial ratio.In order to suppress surface waves,the laminated microstrip antenna in this paper is not filled with other dielectrics.The use of a folded conductive wall stabilizes the phase center stability of the antenna and improves the antenna's ability to resist multipath effects.In the fourth part,a microstrip magnetic dipole antenna and a new choke coil are designed.The phase center of the antenna has good stability,and the antenna has an extremely wide angular axis ratio.The antenna uses support pillars and fixed pillars made of non-metallic materials,which increases the strength of the antenna structure.The Wilkins power divider and phase shifter were used as the feeding network of the antenna.The magnetic dipole antenna used two points of feed.The simulation analysis was performed using HFSS electromagnetic simulation software,and the real object was produced.The test results are basically consistent with the simulation results.