I.J. Garcia Zuazola, J.C Batchelor, R.J.  Langley, “Miniaturised Multiband PIFA Antenna using a Frequency Selective Surface (FSS) Ground Plane", Antennas and Propagation Conference, 2007, Loughborough, 2-3 April 2007 Page(s):281 - 284

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