| Beidou satellite navigation system is China’s independent research and development,independent operation of the satellite navigation system.With the development of China’s economy,all walks of life will continue to increase the demand for location information,so the Beidou navigation system is bound to dominate the satellite navigation market in China,and will serve the world.Antenna as an important radio equipment for transmitting and receiving electromagnetic waves is also an indispensable part of the navigation satellite system.In recent years,the study of the Beidou navigation antenna is also more and more,its miniaturization,multi-band has become more and more attention.Therefore,this paper uses the antenna miniaturization technology and multi-frequency technology,through the HFSS electromagnetic simulation software designed for three Beidou satellite navigation antenna.Mainly for the following three aspects:1 Design a small circularly polarized microstrip antenna operating at the Beidou generation S-band(2.491 GHz).The antenna open two pairs of vertical incision in the circular patch x-axis and y-axis edge,and in the incision to load the short circuit to achieve the miniaturization of the antenna.Experimental results show that the size of the antenna than ordinary antenna reduced by nearly half,the antenna impedance bandwidth of 100MHz,3dB axis than the bandwidth of 30MHz.2 Design a circular polarized microstrip antenna for the Beidou second-generation band,and through the improvement of the antenna structure,to achieve both the Beidou second-generation band(1.561 GHz)and GPS band(1.575GHz).The antenna is in the square patch to open two pairs of different sizes of circular groove,by adjusting the diameter of the ring groove to meet the circular polarization performance.The perfect structure is based on the original antenna,in the center of the square patch to load the cross groove,to improve the antenna impedance bandwidth and shaft bandwidth,making it for the Beidou navigation system and GPS sharing.3 Design a Beidou second generation and GPS shared dual-frequency circular polarized patch antenna.The antenna through the two-layer patch to achieve dual-band.Experiments show that the antenna covers the Beidou second generation band(1.561GHz)and frequency band(1.207GHz),there are GPS band(1.575GHz).And has a circular polarization performance at three frequencies. |
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