Title :
Eigen-mode analysis of a novel three-mode microstrip/slot-line resonator and the development of a compact bandpass filter with multiple transmission zeros and wide stopband property
Author :
Ohira, Masataka ; Ma, Zhewang
Author_Institution :
Grad. Sch. of Sci. & Eng., Saitama Univ., Saitama, Japan
Abstract :
A novel compact three-mode resonator is proposed, which consists of a parallel-coupled microstrip line resonator embedded with a slotline resonator. Resonance mechanism and properties of these three modes are analyzed and verified by using an electromagnetic simulator. Four transmission zeros are produced because of multi-paths between the input/output stub lines formed by the three resonant modes and the direct source-load coupling. A circuit model is proposed and a very compact bandpass filter is developed, which has three reflection zeros in the passband and four transmission zeros near the passband, showing sharp skirt property and a wide stopband.
Keywords :
band-pass filters; band-stop filters; eigenvalues and eigenfunctions; microstrip filters; resonator filters; compact bandpass filter; direct source-load coupling; eigenmode analysis; electromagnetic simulator; input-output stub lines; multiple transmission zeros; parallel-coupled resonator; reflection zeros; resonant modes; sharp property; three-mode microstrip-slot line resonator; wide stopband property; Couplings; Filtering theory; Integrated circuit modeling; Microstrip resonators; Resonant frequency; Slotline; Microwave filters; bandpass filters; coupling circuits; microstrip filters;
Conference_Titel :
Microwave Symposium Digest (MTT), 2011 IEEE MTT-S International
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-61284-754-2
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2011.5972756
