Chen, Zhi Ning, UWB Antennas: From Hype, Promise to Reality", Antennas and Propagation Conference, 2007, Loughborough, 2-3 April 2007 Page(s): 19-22
The publication is available to download from http://ieeexplore.ieee.org/xpl/tocresult.jsp?isnumber=4218444&isYear=2007