Open AccessCompact Tunable Balanced Dual-band Bandpass Filter Using Tri-Stub Loaded Resonator
Author(s) -
Hong Yang,
Dewei Zhang,
Junjie Zhang,
Xian Wang,
Chenqing Pan,
Zhuang Ma,
Yufan Fu
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1914/1/012039
Subject(s) - band pass filter , passband , varicap , resonator , stub (electronics) , dual mode , fractional bandwidth , multi band device , optoelectronics , bandwidth (computing) , materials science , insertion loss , diode , physics , electronic engineering , optics , telecommunications , computer science , engineering , capacitance , electrode , quantum mechanics , antenna (radio)
This letter proposes a tunable balanced dual-band bandpass filter (BPF) with high common-mode (CM) suppression based on tri-stub loaded resonator (TSLR). Two TSLRs terminated with varactor diodes are employed to obtain the tunable second differential-mode (DM) passband, which is independent of the first one. For validation, a tunable balanced dual-band BPF is designed, fabricated and measured that achieve the continuous frequency-tuning range of the second DM passband from 5.968 to 6.368 GHz with constant 3dB fractional bandwidth (FBW) of 6.8% ± 0.17% and CM rejection levels of over 30 dB. The measured results agree well with the simulated ones.