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A widely tunable bandpass filter adopting novel fully tunable resonators
Author(s) -
Zhang ZhongHai,
Zhao Fei,
Wu Aiting,
Zhihua Fang,
Guan BoRan
Publication year - 2019
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21684
Subject(s) - resonator , band pass filter , center frequency , materials science , coupling (piping) , filter (signal processing) , optoelectronics , coupling coefficient of resonators , electronic engineering , computer science , engineering , metallurgy , computer vision
A widely tunable bandpass filter adopting a novel fully tunable resonator is proposed in this letter. The fully tunable resonator is mainly consisted of an open ring, a frequency tuning structure, and a coupling tuning structure. Adopting the fully resonators, the center frequency, the input/output external Q value, and the coupling coefficients can be tuned at the same time. And the tuning range of a tunable filter adopting the novel fully tunable resonators can be expanded. The fully tunable resonators can be combined to achieve more excellent suppression performance. A widely tunable bandpass filter consisted of five fully tunable resonators with 86.5% frequency tuning range is designed, fabricated, and measured. The simulated results are in good agreement with the measured ones.