Coplanar Antenna Design for GNSS and WiFi Applications

Abstract

This paper proposes a co-planar waveguide (CPW) for GNSS fed circularly polarized antenna, which mainly contributes to proper slotting and implantation of metal stubs on the ground plane to control impedance matching and axial ratio. By embedding two slots in the monopole antenna, it can achieve better impedance matching. In addition, an L-shaped slot is buried in the ground plane and a T-shaped stump is added. Combined with its own ground structure, it helps the antenna to excite an electric field with a phase difference of 90 degrees and equal amplitude at high frequency to achieve a circle polarized radiation characteristics. The antenna proposed in this paper uses FR4 as the substrate, and its antenna size is 55 × 55 × 1.6 mm3, and can cover the global navigation system (GNSS E1/L1/G1) and WiFi 2.45 GHz operating band.