The Design Of The Antenna For Multi-frequency Navigation Receiver

Global navigation satellite system (GNSS) refers to a kind of space navigation technology for navigation and positioning on the ground, sea and space using in the sky of the navigation satellite. With the establishment of China’s Beidou satellite COMPASS networks, and with the United States GPS, Russia GLONASS and the European Union GALILEO, they are building the world four big global navigation and positioning system. In order to meet the requirements of multi-mode and multi-band navigation technology, it needs to design an ultra broadband, multi-band and circular polarization antenna. In the premise, this paper focuses on the study of microstrip antenna with circular polarization and miniaturization technology, designed a kind of UWB antenna structure model.This paper is studied the circular polarization antenna’s design theory and realization methods, and designing two circular polarization antennas, respectively. First a dual-band circularly polarized microstrip antenna is designed, which is working in satellite navigation L frequency band. Its working frequency is L1(1575MHz) and L2(1227MHz). The antenna generates right-hand circular polarization signals to cut angle form, meanwhile it can realize the miniaturization of antenna requirements.Secondly a multiband UWB antenna is designed, which is including the design of the antenna feed network, selection of antenna’s feeding methods, simulation and optimal antenna patch, at last analyzing the dielectric substrate, the feed probe, radiation effects of patch shape and height and other parameters on the antenna performance. After continuous processing, testing, and improvement, the antenna’s axis ratio, pattern, gain characteristics are improving. So the antenna can meet the broadband, multi-band and circular polarization requirements.Finally, according to the antenna suppressing multipath effect, in order to improve the ability of antenna suppressing multipath effect, the choke is designed; at the same time, also has carried on the design of radome. The simulation and test results show that, the design of multiple frequency ultra-wideband antennas can meet the requirements of satellite navigation receiver.