Design of high-performing microstrip receiving GPS antennas with multiple feeds

In this letter, we present the design of two new high-performing microstrip receiving antennas for the Global Positioning System (GPS). Both layouts proposed here are based on the employment of multiple feeds in order to improve the polarization purity and the pattern symmetry, thus leading to an improved accuracy of the system. The first antenna configuration consists of a truncated-corner squared patch with concentric rings of miniaturized magnetic resonators in order to suppress the surface wave contribution and reduce the back-radiation of the antenna. The second radiator consists of a circular patch antenna with four feeds and loaded with a number of vias in order to improve the front-to-back ratio. Full-wave numerical simulations are presented to show the effectiveness of the proposed design in terms of impedance matching, polarization purity, antenna gain, front-to-back ratio, and shape of the radiation pattern.