The Ultra Wide band (UWB) antennas play an important role in UWB system. As a crucial component of the UWB system, the UWB antennas affect performance of the system significantly and have advantages of low profile, low power consumption and integration easily, so they are widely used in communication systems. The Federal Communication Commission (FCC) authorized the unlicensed use of the UWB (3.1GHz~10.6 GHz) in February 2002. This dissertation firstly gives a brief introduction on the development history and research status of UWB antenna. Secondly, the main performance parameters, the method and the performance of the UWB antenna are analyzed in detail. Combined with these characteristics of UWB system, this paper provides the design requirements of ultra-wide band antenna. Then, based on the above research and analysis, the author designs an ultra-wide band antenna structure by using CST MWS simulation software, and realizes the WLAN band notched performance by loading structure. Finally the author comes to the conclusion.

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