L.I. Basilio, R.L. Chen, J.T. Williams, D.R. Jackson, A New Planar Dual-Band GPS Antenna Designed for Reduced Susceptibility to Low-Angle Multipath ", IEEE Transactions on Antennas and Propagation, Volume: 55 Issue: 8, Aug. 2007, Page(s): 2358-2366
The publication is available to download from http://ieeexplore.ieee.org/xpl/tocresult.jsp?isnumber=4285964&isYear=2007