Title :
Compact differential ultra-wideband bandpass filter based on transversal filter concepts
Author :
Feng, Wenjie ; Che, Wenquan ; Eibert, Thomas F. ; Xue, Quan
Author_Institution :
Dept. of Commun. Eng., Nanjing Univ. of Sci. & Technol., Nanjing, China
Abstract :
A compact differential ultra-wideband (UWB) bandpass filter with high selectivity based on transversal filter concepts is proposed in this paper. Two transmission zeros and good harmonic suppression can be achieved for the differential mode, due to the two transmission paths with different lengths for input/output ports. Four quarter-wavelength shorted lines are added to improve the passband transmission characteristic for the differential mode. In addition, the common mode can be suppressed easily in the whole frequency band. A prototype with fractional bandwidth 101% and return loss greater than 16.5 dB for differential mode is designed and fabricated; the measured results show good agreement with the theoretical expectations.
Keywords :
band-pass filters; transversal filters; ultra wideband technology; UWB filter; compact differential ultrawideband bandpass filter; fractional bandwidth; harmonic suppression; passband transmission characteristic; quarter-wavelength shorted lines; transmission paths; transmission zeros; transversal filter concepts; Band pass filters; Filtering theory; Loss measurement; Microwave filters; Passband; Transversal filters; Ultra wideband technology; Ultra-wideband (UWB); common mode; differential mode; transmission zeros; transversal filter concepts;
Conference_Titel :
Microwave Conference (EuMC), 2011 41st European
Conference_Location :
Manchester
Print_ISBN :
978-1-61284-235-6
