Design and Fabrication of GPS Microstrip Antenna

Abstract

A new design of microstrip patch antenna for Global Positioning System (GPS) is presented. The proposed model operates at 1. 575GHz resonant frequency and has a gain 4.974 dBi and axial ratio 2.956 with S11 = – 35.S54dB. Various parameters such as return loss, Voltage Standing Wave Ratio (VSWR) and input impedance has been analyzed. The GPS antenna elements is achieved by using rectangular patch with two corners truncated slots. Many slots are added to the patch and ground plane to obtain the resonant frequency at best value of return loss (i.e. S11 $\leq$-10dB). The model was fabricated and tested practically using Vector Network Analyzer (VNA). The proposed patch antenna was manufactured on substrate with relative dielectric constant $\varepsilon \mathrm{r}=4.3$ and loss tangent $\tan\delta=0.025$ and tested practically. It was noted that there is a reasonable agreement between the simulation results and practical results. The slight difference is attributed to manufacturing errors.