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A 0.61‐2.39 GHz fully tunable bandpass filter with minimum number of loaded varactors
Author(s) -
Lan BoZhang,
Li HaiXiong,
Guo ChenJiang,
Ding Jun
Publication year - 2019
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31561
Subject(s) - passband , band pass filter , resonator , center frequency , bandwidth (computing) , materials science , electrical impedance , optoelectronics , electronic engineering , electrical engineering , physics , acoustics , optics , telecommunications , engineering
A 2‐pole fully tunable bandpass filter (BPF) with only two varactors implemented is proposed in this paper. The ultra‐wide center frequency (CF) tuning range is built on short‐ended stepped‐impedance resonators (SIRs). Two varactors are placed at the symmetrical plane of the filter in series and shunt configurations, according to the odd‐even mode analysis the CF and bandwidth (BW) of the passband can be tuned independently without adding any redundant tuning elements. The CF of the proposed filter can be tuned from 0.61 to 2.39 GHz. The 3 dB BW tuning range is 150‐260 MHz at the lower side and 290‐520 MHz at the upper side of the entire passband tuning range. Good agreement is observed between simulated and measured results.