“…However, within this band, the 5.15-5.825 GHz frequency band is used by IEEE 802.11a wireless LAN (5.5-GHz WLAN) system and, thus, any electromagnetic interference caused from the use of 5.5-GHz WLAN system should be avoided to ensure the UWB transmitter performance. So far, several UWB antennas with the rejected band of 5.15-5.825 GHz have been reported, which applied different techniques including use of the parasitic element [1], shaped slotted-patch [2][3][4][5][6], resonator element [7,8], defected ground structure [9][10][11], and distorted patch or strip [12][13][14][15]. However, most of them are not only with a complex or larger structure but also with a difficult fabrication process resulting from achieving the band-rejection function by inserting slot or additional control element into the antenna.…”