Title :
Ultra-wideband (UWB) bandpass filters with improved upper-stopband performance
Author :
Wong, Sai Wai ; Sun, Sheng ; Zhu, Lei ; Chen, Zhi Ning
Author_Institution :
Nanyang Technol. Univ., Singapore
Abstract :
A novel ultra-wideband (UWB) bandpass filter with improved upper-stopband performance is presented and constituted by integrating an initial UWB filter with two lowpass filters at its two sides. Firstly, a multiple-mode resonator is formed with first three resonant frequencies located within the 3.1-10.6 GHz UWB band while its two-side high-impedance sections are excited by two interdigital coupled lines with enhanced coupling degree, leading to make up an initial UWB filter. Secondly, two 3rd- or 5th-order lowpass filters are designed with their cut-off frequency slightly higher than 10.6 GHz (upper-end), aiming at suppressing the spurious upper-passband near the interested UWB passband. Finally, a resultant UWB bandpass filter is optimized, fabricated and measured to give us an evident confirmation on the improved upper-stopband performance.
Keywords :
band-pass filters; low-pass filters; ultra wideband technology; UWB bandpass filter; frequency 3.1 GHz to 10.6 GHz; interdigital coupled lines; lowpass filters; ultra-wideband bandpass filters; Band pass filters; Coplanar waveguides; Frequency; Insertion loss; Microstrip filters; Microstrip resonators; Passband; Resonance; Resonator filters; Ultra wideband technology; UWB bandpass filter; microstrip-line filters; multiple-mode resonator; wide upper stopband;
Conference_Titel :
Microwave Conference, 2006. APMC 2006. Asia-Pacific
Conference_Location :
Yokohama
Print_ISBN :
978-4-902339-08-6
Electronic_ISBN :
978-4-902339-11-6
DOI :
10.1109/APMC.2006.4429372
