Directional ultrawideband (UWB) antennas are popular in wireless signal-tracking and body-area networks. This paper presents a\r\nstacked microstrip antenna with an ultrawide impedance bandwidth of 114%, implemented by introducing defects on the radiating\r\npatches and the ground plane. The compact (20 Ã?â?? 34mm) antenna exhibits a directive radiation patterns for all frequencies of\r\nthe 3ââ?¬â??10.6GHz band. The optimized reflection response and the radiation pattern are experimentally verified.The designed UWB\r\nantenna is used to maximize the received power of a software-defined radio (SDR) platform. For an ultrawideband impulse radio\r\nsystem, this class of antennas is essential to improve the performance of the communication channels.
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