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A compact high-performance circularly-polarized microstrip antenna for the global positioning system application is proposed. It comprises a fractal hi-impedance surface electromagnetic bandgap (EBG) structure printed on a high permittivity substrate. Measurements and simulation of return loss and axial ratio are in good agreement. It is shown that the proposed Global Positioning System antenna has good axial ratio performance in the upper half-plane, an improvement in gain and a significantly wider axial ratio bandwidth when compared to the same antenna without EBG
Bao, X., Ruvio, G., Ammann, M., John, M.: A novel GPS patch antenna on a fractal Hi-Impedance surface substrate. IEEE Antennas and Wireless Propagation Letters, 2006, Vol.5, issue 1, pp.323-326.