Title :
Performance of a planar filter using a 0° feed structure
Author :
Tsai, Chih-Ming ; Lee, Sheng-Yuan ; Tsai, Chin-Chuan
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
fDate :
10/1/2002 12:00:00 AM
Abstract :
The advantage of using a 0° feed structure in filter design is that two extra transmission zeros are created in the stopband while the passband response remains unchanged. This feed structure is analyzed by using transmission matrices. A new lumped-circuit model for a coupled resonator filter is then proposed to take into account the effects of this feed structure. Finally, the feed structure is applied to the design of a cross-coupled filter. All the theoretical analysis and design procedures have been successfully verified by experiment results.
Keywords :
Butterworth filters; coupled circuits; coupled transmission lines; lumped parameter networks; microwave filters; poles and zeros; resonator filters; transmission line matrix methods; 0° feed structure; coupled resonator filter; cross-coupled filter; filter design; lumped-circuit model; passband response; planar filter; second-order Butterworth filters; stopband rejection; transmission matrices; transmission zeros; Coupling circuits; Feeds; Filtering theory; Magnetic separation; Microwave filters; Passband; Resonator filters; Transmission line matrix methods; Transmission line theory; Transmission lines;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2002.803421
