GPS/CNSS Tri-band Shared Circularly Polarized Microstrip Antenna Design

With the continuous development of modern wireless communication technology,CNSS played in the fields of military,agriculture and economy more and more important role,but as a navigation and positioning system developed in China,the Compass Navigation Satellite System currently can only achieve regional navigation and positioning services,is also unable to realize global navigation and positioning.With the same GPS as early as in the last century has been completed in 90s the global navigation service,thus to promote and Compass Navigation Satellite System developed in China to meet the needs of people's life,sharing of GPS and Compass Navigation Satellite System terminal research is particularly important.For navigation and positioning terminal,to achieve GPS and CNSS sharing,first of all to make the terminal antenna can receive GPS and CNSS signals.In order to meet the CNSS terminal antenna of high gain,low angle circular polarization performance and right-hand circular polarization of the basic requirements,based on the double feed method,the relative dielectric constant of the material as the substrate,the patch antenna with a work in the two generation of the CNSS B3 band design,and the structure of antenna and feed network is optimized the Agilent Co Ansoft HFSS simulation software,the simulation results show that the antenna resonance 1268MHz(two generation CNSS B3 frequency),the antenna gain reaches 3.4dBi in the operating frequency band axis ratio is less than 3dB,and the elevation is the gain of the antenna is-1.83dBi,meet the requirement of CNSS antenna.At the same time,in order to improve the antenna efficiency,reduce the cost of the antenna,the replacement of the high dielectric constant dielectric plate,and by broadening the bandwidth of the antenna technology,the bandwidth of the antenna from the previous 56MHz to close to 500MHz,which covers both GPS band L2 system(1227MHz),CNSS(1207MHz)and B2 band B3 band(1268MHz),through the HFSS software simulation and physical processing,results show that the antenna is capable of covering three bands of GPS and CNSS,and in three working frequency,the antenna gain is larger than OdBi,the axial ratio is less than 3dB,are right-handed circular polarization,meet the requirements of GPS and CNSS antenna requirements.