Design of GNSS Antenna Using Polarizer

摘要

In this paper, a novel wideband circularly polarized global navigation satellite system (GNSS) antenna, operating in the frequency band 1 – 1.6 GHz is presented. An artificial magnetic conductor (AMC) reflector is employed for directing the radiation of the antenna only in the positive z-plane. The proposed antenna uses a simple single layer 2D frequency selective surface (FSS) polarizer to convert the linearly polarized wave radiated by the antenna into a circularly polarized wave. This polarizer consists of an array of 11 x 11 "T" shaped unit-cells that works in the 1 – 1.7 GHz frequency band at normal and oblique incidence. To demonstrate the validity of the antenna, simulation results by placing the "T" shaped polarizer in the broadside direction of the antenna have been shown. An axial ratio (AR) smaller than 3 dB is obtained in the desired GNSS frequency band from 1 to 1.6 GHz with gain enhancement, demonstrating the effectiveness of the polarizer.