Coaxial feed archimedean spiral antenna for GPS application / Muhammad Firdaus Mohd Yusop

This work highlights the design, simulation and analysis of an Archimedean spiral antenna for GPS application. The antenna was fed using coaxial feed and a prototype was fabricated on Roger Duroid(FR4) of dielectric constant, er = 4.9 with thickness of 1.54 mm while the center frequency was 1.575 GHz. Antenna design and simulation were carried out using commercial electromagnetic simulator, CST. The prototype ASA was released, measured and analyzed using Vector Network Analyzer (VNA). 2D radiation pattern was obtained by using antenna training system_ED3200. It was observed that the measured and simulated values of the parameters of the ASA were close with each other. An omnidirectional radiation pattern was realized. It was observed that frequency independent was achieved by having the same values of inner radius r, width of arm w and the spacing between each turn,s.