New design of multilayer wideband gnss antenna with dual layer strip lines fed

摘要

A compact circularly polarized shorted annular stacked patch antenna has been proposed for global navigation satellite system (GNSS) in this paper. The antenna has been designed to operate for the satellite navigation frequencies including GPS, GLONASS, Galileo and Compass (1100MHz-1600MHz). Dual layer strip lines which being composed of one broadband 180° hybrid and two wideband 90° hybrids are introduced as feeding network. As a result, the antenna has a 50.8% 10-dB return loss bandwidth from 1.1GHz to 1.85GHz, and 45.5% 3-dB axial ratio bandwidth from 1.07GHz to 1.7 GHz, respectively. The designed antenna occupies a compact size of 70mm×70mm×28.5mm. In this paper, shorted annular stacked patch is introduced to obtain stable gain bandwidth, broad beamwidth characteristics and good axial ratio at low elevation. The final antenna provides very good circularly polarized radiation for GNSS.