Title :
Compact dual-band quasi-elliptic bandpass filter with improved upper-stopband performance
Author :
Chan-Keong Chio ; Sio-Weng Ting ; Xunwang Zhao ; Kam-Weng Tam
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Macau, Macau, China
Abstract :
A compact dual-band bandpass filter with an improved upper stopband using defected ground structure is proposed. This filter offers quasi-elliptic responses at both the passbands, and the upper-stopband performance is improved by using end-coupled microstrip lines loaded with non-uniform shunt open stubs. An example dual-band bandpass filter is designed to demonstrate the effectiveness of the approach. The measurement shows a very good agreement with the simulation results. In addition, the implemented dual-band quasi-elliptic filter has a compact size of 0.24λ × 0.19λ and a wide stopband of better than 35-dB attenuation from 4.8 GHz to 9 GHz.
Keywords :
band-pass filters; band-stop filters; elliptic filters; microstrip lines; microwave filters; compact dual-band bandpass filter; defected ground structure; end-coupled microstrip lines; improved upper-stopband performance; nonuniform shunt open stubs; quasielliptic bandpass filter; quasielliptic responses; Band pass filters; Dual band; Filtering theory; Microstrip; Microstrip filters; Microwave filters; Passband; Dual-band; defected ground structure (DGS); improved stopband performance; quasi-elliptic; shunt open stubs;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2012 Asia-Pacific
Conference_Location :
Kaohsiung
Print_ISBN :
978-1-4577-1330-9
Electronic_ISBN :
978-1-4577-1331-6
DOI :
10.1109/APMC.2012.6421518
