The Federal Communications Commission (FCC) first adopted ultra-wideband (UWB) for short-range peer-to peer ultra-fast'communication [1]. The design and implementation of UWB system has become a popular topic in both academy and industry communities of telecommunications. In particular, as an important component of the UWB system, a broad band antenna will be launched in the frequency range from 3.1 GHz – 10.6 GHz, which has attracted immense research Tower in the recent years [2]. In the UWB system, there are some other existing narrowband services that already occupy ccupy frequencies in the UWB band, such as 'wireless local-area network (WLAN) IEEE 802.11a and HIPERLAN/2 WLAN operating in the 5 GHz– 6 GHz band [3]. It is desired to design the UWB antenna with notched frequency bands 5 GHz '– 6 GHz to minimize the interferences between' the UWB system and narrowband systems. This paper proposes a microstrip fed planar UWB antenna with band-notched characteristics in 5.5' GHz (5 GHz – 6 GHz).
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