Designing band notch features in ultra-wideband antenna

Due to need of high data rate and high speed in wireless communication Ultra-wideband technology comes out as one of the emerging technology that fulfill the requirement of the high speed in wireless communication because of its ultra-wide bandwidth. In order to implement Ultra-wideband technology many challenges comes into account. The first challenge which is most important one is to get an antenna that successfully operate in spectrum of ultra-wideband technology. Second challenge is the electromagnetic interference with the existing narrow band systems. Since UWB technology spectrum ranges from 3 GHz to 11 GHz, in this band also there exist a Wireless Local Area Network bands from 5.15 GHz to 5.35 GHz and 5.725 GHz to 5.825 GHz. So UWB System interfere with WLAN system which needs to eliminate this electromagnetic interference. The band rejection feature are obtained by etching a rectangular slot near the feed line of the antenna for good coupling. The center frequency of the notch frequency depends upon the length and width of the rectangular slot and by using a specific length and width of the rectangular slot a band notch center frequency is obtained at 9 GHz. The bandwidth of notch band depends upon the gap in the rectangular slot. By increasing the gap, bandwidth of the notch increases and vice versa. An optimal gap is used in the rectangular slot to obtain a bandwidth of notch band from 8.5–9.5 GHz.