Title :
Ultra-Wideband (UWB) Microstrip Bandpass Filters with Improved Upper-Stopband and Miniaturized Size
Author :
Wong, Sai Wai ; Zhu, Lei
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore
Abstract :
An ultra-wideband (UWB) microstrip bandpass filter with improved upper-stopband and miniaturized size is presented. A modified multiple-mode resonator is formed by transversely attaching three pairs of non-uniform and folded stubs. Its configuration is then investigated, aiming to allocate the first three resonant frequencies within 3.1-10.6 GHz band while suppressing spurious harmonics at the upper-stopband. Plus, its high-impedance sections in two sides are linked with two feed lines via interdigital coupled lines, leading to make up an initial UWB filter. Then, two-stage UWB bandpass filter is constructed to sharpen the rejection skirt and deepen the upper-stopband. Finally, two filters are optimized, fabricated and measured to give us an evident confirmation on the improved UWB performance.
Keywords :
band-pass filters; microstrip filters; microwave filters; resonators; UWB filter; interdigital coupled lines; multiple-mode resonator; resonant frequency; spurious harmonics; ultra-wideband microstrip bandpass filters; upper-stopband; Band pass filters; FCC; Feeds; Frequency; Insertion loss; Microstrip filters; Microstrip resonators; Passband; Resonator filters; Ultra wideband technology; UWB bandpass filter; microstrip line; multiple-mode resonator; wide upper stopband;
Conference_Titel :
Microwave Conference, 2007. APMC 2007. Asia-Pacific
Conference_Location :
Bangkok
Print_ISBN :
978-1-4244-0748-4
Electronic_ISBN :
978-1-4244-0749-1
DOI :
10.1109/APMC.2007.4555158
