Research Of Dual-Band Circularly Polarized Antenna In Beidou Terminal

With the sustainable development of the technology and positioning technology in satellite navigation, navigation and positioning system applications arrange is expanding and is widely used in various aspects of social life,becoming one of the three global information industries which are growing fast. BD satellite navigation system is an independent operation satellite navigation system. The antenna directly affects the performance of the whole system as a key component in BD navigation positioning system. Therefore, researching antenna is extremely necessary in BD satellite navigation and positioning system. There are a lot of researches on circularly polarized microstrip antennas in BD terminal receiver. With the continuous development of navigation technology, there are a lot of stringent requirements to terminal receiver antennas which are miniaturization, multi-frequency, wide band, high gain, high axial ratio and others.In this context, the paper discussed and analyzed the technology of circularly polarized microstrip antennas covering methods of single feed, dual-fed and four feed. In this thesis, the main work is the following three aspects:1、Analyzed the common methods and the principles of circularly polarized microstrip antenna, and summarized circularly polarized microstrip antennas which are used in today’s engineering.2、Discussed the implementation methods of dual-band microstrip antennas and introduced the design methods of microstrip antennas。3、Designed dual-band circularly polarized microstrip antennas of different methods which are used of single feed, dual-fed and four feed according to the requirements of the navigation terminal antenna. In this chapter,introduced some basic knowledge of the power divider and designing processes, and applied them to the unit of the microstrip antennas. With the help of electromagnetic simulation software HFSS, the designed antennas had been simulated and optimized, and the simulation results were compared.4、Based on the simulation results above, choosing dual-band circularly polarized microstrip antenna which is fed by3dB bridge as a unit to form an array. And optimization is carried out.Finally, reviewed the main work of this paper and the main conclusions, and prospected the circularly polarized microstrip antenna in BD satellite navigation system in future development.Xiaoying Gui (Detection Technology and Automatic Apparatus)...