Ultra wideband notch implementation using H-shaped resonator.

Ultra wide band (UWB) is defined as the range of frequencies from 3.1 to 10.6 GHz. This wireless technology is used for transmitting data at high rates with very low power for short distances. In the year 2002 Federal Communication Commission (FCC) of United States approved the use of UWB for commercial applications. Efficient functioning of UWB systems are degraded by the presence of interference signals owing to existing UWB applications. Some of the major UWB applications are WLAN in 5 - 6 GHz range and satellite communication signals around 8 GHz. Interference due to a particular application can be eliminated by using a narrowband notch filter. This paper proposes an embedded H-shaped resonator which can be used for notch implementation in UWB spectrum. Two notch bands are produced which corresponds to even and odd modes of the resonator. Notch frequencies obtained can be easily adjusted by varying the resonator dimensions. This method can be effectively used for single notch implementation in UWB bandpass filters(BPFs), there by splitting the passband into two. Dual band BPFs thus obtained can be used in UWB systems to pass required signals and to reject interference signals. A notch frequency variation of 5.5 to 8.59 GHz is obtained by varying the parameters of the resonator. FR4 substrate with dielectric constant 4.4, loss tangent 0.02 and thickness 1.6 mm is used for the filter. Simulation of the filter has been done using HFSS software. [ABSTRACT FROM AUTHOR]