Title :
A compact size coupling controllable filter with separate electric and magnetic coupling paths
Author :
Ma, Kaixue ; Ma, Jian-Guo ; Yeo, Kiat Seng ; Do, Manh Anh
Author_Institution :
Center for Integrated Circuits & Syst., Nanyang Technol. Univ., Singapore, Singapore
fDate :
3/1/2006 12:00:00 AM
Abstract :
This paper presents the characteristics of a miniaturized microstrip filter, which has two separate coupling paths: electric coupling path and magnetic coupling path between two resonators. Either magnetic coupling or electric coupling in two paths can be dominant in the total coupling coefficient of the inter-stage resonators with the similar configuration, but different positions of transmission zero points (ZPs). Based on the proposed filter topology, second- and fourth-order filters have been designed and fabricated for the first time. Advantages of using this type of filter are not only its low insertion loss and much more compact size, but also its controllable transmission ZPs.
Keywords :
band-pass filters; coupled circuits; microstrip filters; resonator filters; bandpass filters; compact size coupling controllable filter; electric coupling path; filter topology; fourth-order filters; inter-stage resonators; magnetic coupling path; miniaturized microstrip filter; second-order filters; total coupling coefficient; transmission zero point; Couplings; Filtering theory; Insertion loss; Magnetic separation; Microstrip filters; Microstrip resonators; Propagation losses; Resonator filters; Size control; Topology; Bandpass filter (BPF); odd and even mode; separate electric and magnetic coupling paths (SEMCPs); zero point (ZP);
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2005.864118
