I. Makris, D. Manteuffel, R.D. Seager, J.C. Vardaxoglou, “Modified Designs for UWB Planar Monopole Antennas", Antennas and Propagation Conference, 2007, Loughborough, 2-3 April 2007 Page(s):249 - 252

The publication is available to download from http://ieeexplore.ieee.org/xpl/tocresult.jsp?isnumber=4218444&isYear=2007