Title :
Novel compact dual-band bandpass filter with improved stopband characteristics
Author :
Guan, Xuehui ; Ma, Zhewang ; Cai, Peng ; Xu, Deming ; Anada, Tetsuo ; Hagiwara, Gen
Author_Institution :
Shanghai Univ., Shanghai
Abstract :
A novel compact microstrip three- pole dual-band bandpass filter is developed with remarkably improved stopband characteristics. Two square open-loop resonators are embedded in a U- shaped resonator to achieve a significant size- reduction of the filter. Meanwhile, microstip open stubs as well as a cross-coupling between nonadjacent resonators are exploited to produce multiple transmission zeros in the stopbands of the filter. As a consequence, wide stopbands with sharp and large attenuations are obtained. Theoretical and measured frequency responses of the designed filter show a good agreement.
Keywords :
band-pass filters; microstrip filters; resonators; U-shaped resonator; compact dual-band bandpass filter; cross-coupling; nonadjacent resonators; open-loop resonators; size-reduction; stopband characteristics; transmission zeros; Attenuation; Band pass filters; Dual band; Filtering theory; Frequency measurement; GSM; Microstrip filters; Microstrip resonators; Resonator filters; Transceivers; cross-coupling; dual-band filter; open-loop resonator; transmission zero;
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.2006.4429614
