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Wideband reconfigurable bandpass filter using coupled lines loaded with varactor loaded stubs
Author(s) -
Shang Yuxia,
Feng Wenjie,
Che Wenquan
Publication year - 2018
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.21195
Subject(s) - passband , band pass filter , bandwidth (computing) , stopband , elliptic filter , wideband , resonator , prototype filter , varicap , high pass filter , electronic engineering , acoustics , materials science , computer science , physics , optoelectronics , telecommunications , engineering , low pass filter , capacitance , electrode , quantum mechanics
In this article, a novel reconfigurable bandpass filter with tunable passband edge and bandwidth is proposed. The bandpass filter enables the two band edges independently adjustable to meet the needs of different systems. The wide tuning range of the bandwidth is achieved by controlling the tuning mechanism to altering not only the coupling strength of the coupled lines but also the transmission zeroes positions of the resonator. The lower passband edge can shifts from 760 to 840 MHz with the upper passband edge keeping still and the upper edge of the passbands from 981 to 1107 MHz with the lower edge keeping still. The overall tuning range of 3 dB fractional bandwidth is from 15.5% to 36%. The upper stopband attenuation of the fabricated structure can reach to 40 dB within a wide frequency range.