Title :
Planar Ultra-Wideband Bandpass Filter Using Edge Coupled Microstrip Lines and Stepped Impedance Open Stub
Author :
Singh, Pramod K. ; Basu, Sarbani ; Wang, Yeong-Her
Author_Institution :
Nat. Cheng-Kung Univ., Tainan
Abstract :
The design and implementation of a planar ultra-wideband (UWB) bandpass filter are presented. Three interdigital edge coupled microstrip lines are used for coupling enhancement. A stepped impedance open stub is used for realizing transmission zeros simultaneously in upper and lower stop bands as well as impedance matching in ultra-wide pass band. A pass band from 3.1-10.6 GHz is achieved with an insertion loss of 0.5 dB, a return loss of about 18 dB, a sharp out-of-band-rejection, and a low group delay of only 0.21ns. Single- and double-section filters are realized to meet the UWB mask requirement. The design of the filter is simple, and it shows good frequency response.
Keywords :
band-pass filters; band-stop filters; frequency response; impedance matching; microstrip filters; microstrip lines; ultra wideband technology; bandwidth 3.1 GHz to 10.6 GHz; double-section filter; frequency response; impedance matching; interdigital edge coupled microstrip lines; planar ultrawideband bandpass filter; sharp out-of-band-rejection filter; single-section filter; stepped impedance open stub; stop band filter; transmission zeros; Band pass filters; Bandwidth; Couplings; Delay; Filtering theory; Impedance; Insertion loss; Microstrip filters; Resonator filters; Ultra wideband technology; Bandpass filter (BPF); interdigital-coupled line; stepped impedance open stub; ultra-wideband (UWB);
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2007.903440
