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A quasi-self-complementary antenna (QSCA) for band-notched ultrawideband (UWB) application free from interference with existing wireless local area network (WLAN) systems is proposed. The designed band-notched UWB operation can be obtained by choosing the size of the parasitic arc-shaped strip opposite to the quarter-circular patch. The proposed antenna has advantages of low cost, easy design and compact size. Details of the proposed design and experimental results of the constructed antennas are presented.