Band Notching Methods Used in Uwb Antennas- a Study

According to federal communication commission (FCC) rules, the 3.1 10.6 GHz band is allocated to the ultra wideband (UWB) applications. Due to the overlap of the currently allocated UWB frequency band with the communication systems such as Wireless Local Area Network (WLAN) bands in the 2.4GHz(2.4–2.484GHz), 5.2GHz (5.15–5.35GHz),and 5.8GHz(5.725–5.825GHz) bands, and the World Interoperability for Microwave Access (WiMAX) system bands 2.5GHz(2.5–2.69GHz), 3.5GHz (3.4–3.69GHz), and 5.8GHz (5.25–5.825GHz). Therefore, an unwanted intrusion will be expected between these frequencies, now a day’s many systems operate across several frequency bands, requiring a band-notched or bandrejected function. The band notching techniques used in the recent papers are tuning stub,shaped slot, parasitic element, and the fractal geometry. In this paper a comparison will be done between these techniques.