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Balun bandpass filter on slot-line resonators with intrinsic balanced performance in amplitude and phase

Published online by Cambridge University Press:  31 May 2018

Lin-Ping Feng*
Affiliation:
Department of Electrical and Computer Engineering, Faculty of Science and Technology, University of Macau, Macau SAR, China
Lei Zhu
Affiliation:
Department of Electrical and Computer Engineering, Faculty of Science and Technology, University of Macau, Macau SAR, China
*
Author for correspondence: Lin-Ping Feng, E-mail: yb57423@connect.umac.mo

Abstract

In this paper, a novel class of balun bandpass filters is presented on slot-line resonator (SLR) toward intrinsic balanced performance in amplitude and phase. The proposed balun filter consists of three inductive-coupled SLRs in the middle, one single-ended unbalanced port, and one balanced port with two terminals. According to the distinct field conversion from the slotline to the microstrip feeding line, good balanced performance in amplitude, and phase performance can be intrinsically realized over a wide frequency range. To validate the proposed technique, a prototype third-order balun filter is designed, fabricated, and measured. Both the simulated and measured results have demonstrated that the proposed balun filter can not only achieve good frequency selectivity but also exhibit intrinsic balanced performance in amplitude and phase.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2018 

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