Ultra-Wideband High Gain Planar Spiral Antenna Design Based on Satellite Navigation

摘要

This paper proposes a wideband high gain planar spiral antenna, it can work in all the frequency points of four global satellite navigation systems(GPS, GLONASS, BEIDOU, GALILEO), which improves the compatibility between the navigation and positioning accuracy. Through the design of antenna radiation structure and metal reflection cavity structure, the bandwidth of antenna is effectively enlarged, and the circular polarization radiation performance of antenna at low frequency is greatly improved. In addition, the miniaturization of antenna profile height is realized by modifying the structure of the exponential feeding baron. The test results show that in the elevation 90°, the right-hand circularly polarized normal gain of the antenna in the frequency band from 1.1 to 2.7 GHz is greater than 5 dBi, the elevation angle 60° gain is greater than 2.3 dBi, the VSWR is less than 2.0, and the axial ratio is less than 3 dB, whice indicates that the antenna has excellent broadband circular polarization radiation performance and engineering application prospects.