Title :
Compact ultra-wideband bandpass filter implemented with stepped impedance resonators and T-shaped line
Author :
Feng, Wenjie ; Che, Wenquan ; Xue, Quan
Author_Institution :
Dept. of Commun. Eng., Nanjing Univ. of Sci. & Technol., Nanjing, China
Abstract :
A compact ultra-wideband (UWB) bandpass filter (BPF) is implemented with stepped impedance resonators (SIR) and T-shaped line. Fractional bandwidth (FBW) of the UWB BPF can be adjusted properly by changing the impedance ratio of the SIR. A transmission zero is created by the central open stub of the T-shaped line to suppress the second harmonic of the filter. In addition, the filter size is further reduced by introducing T-shaped transmission line. The resulting UWB filter indicates a FBW of 108% with three transmission zeros at 2.3, 11.1 and 13.4 GHz. Good agreement can be observed between simulated and measured responses.
Keywords :
band-pass filters; electric impedance; harmonics suppression; resonator filters; transmission lines; T-shaped transmission line; UWB filter; compact ultra-wideband bandpass filter; filter size; fractional bandwidth; frequency 11.1 GHz; frequency 13.4 GHz; frequency 2.3 GHz; impedance ratio; second harmonic suppression; stepped impedance resonator; transmission zero; Band pass filters; Bandwidth; FCC; Filtering theory; Impedance; Millimeter wave technology; Power harmonic filters; Resonance; Resonator filters; Ultra wideband technology; T-shaped line; Ultra-wideband (UWB); bandpass filter (BPF); fractional bandwidth (FBW); stepped impedance resonator (SIR); transmission zero;
Conference_Titel :
Microwave and Millimeter Wave Technology (ICMMT), 2010 International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-5705-2
DOI :
10.1109/ICMMT.2010.5525292
