Publication: IEICE TRANSACTIONS on Communications Publication Date: 2007/09/01 Vol. E90-BNo. 9pp. 2230-2238 Type of Manuscript: Special Section PAPER (Special Section on 2006 International Symposium on Antennas and Propagation) Category: Antennas Keyword: UWB, bowtie-antenna, unidirectional radiation, waveform distortion, cross-correlation,