Compact Dual-Mode Balun Bandpass Filter with Improved Out-of-Band Performance

A compact dual-mode balun bandpass filter with improved out-of-band performance is proposed based on a ring resonator. In order to excite the two degenerate modes and obtain filtering balun performance, three parallel-coupled lines are placed at three excitation ports along the ring resonator. By pr...

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Bibliographic Details
Published in:Journal of electrical engineering & technology 2021, 16(4), , pp.1841-1844
Main Authors: Gao, Shan Shan, Yi, Gang Yu, Sun, Sheng
Format: Article
Language:English
Subjects:
Electrical Engineering
Electrical Machines and Networks
Electronics and Microelectronics
Engineering
Instrumentation
Original Article
Power Electronics
전기공학
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Description
Summary:A compact dual-mode balun bandpass filter with improved out-of-band performance is proposed based on a ring resonator. In order to excite the two degenerate modes and obtain filtering balun performance, three parallel-coupled lines are placed at three excitation ports along the ring resonator. By properly arranging the angles between the excitation arms, four transmission zeros can be realized to improve stopband performance. Finally, a prototype of the designed balun bandpass filter is implemented and fabricated. The measured results show a good agreement with those obtained from the simulation, thus verifying our proposal with good in-band filtering and out-of-band performance.
ISSN:1975-0102
2093-7423
DOI:10.1007/s42835-021-00721-9