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A fully tunable two‐pole bandpass filter using the resonator with asymmetrical capacitances
Author(s) -
Tian Dengyao,
Feng Quanyuan,
Xiang Qianyin
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.31955
Subject(s) - band pass filter , varicap , coupling coefficient of resonators , bandwidth (computing) , resonator , electronic filter topology , prototype filter , mechanical filter , materials science , voltage controlled filter , m derived filter , high pass filter , electronic engineering , filter (signal processing) , low pass filter , optoelectronics , physics , capacitance , engineering , electrical engineering , telecommunications , electrode , quantum mechanics
A fully tunable second‐order bandpass filter based on novel resonator is proposed. The resonating frequency and the coupling coefficient between the resonators can be controlled by two varactor diodes. Theoretical expressions have been derived for the coupling coefficient. Four types of filter responses can be reconfigured by setting different bias voltage combinations, including tunable bandwidth filter, constant absolute bandwidth filter, constant fractional bandwidth filter, and decrease bandwidth filter. The simulation and measured results of the four responses are in good agreement with each other, and excellent tunable characteristics are achieved.