TY - JOUR
T1 - Compact Wideband Bandstop Filter With Directly Controlled Rejection
AU - Liu, Liang
AU - Liang, Xianling
AU - Fan, Haijun
AU - Jin, Ronghong
AU - Bai, Xudong
AU - Geng, Junping
N1 - Funding Information:
Manuscript received November 8, 2020; revised December 19, 2020; accepted January 4, 2021. Date of publication January 6, 2021; date of current version June 29, 2021. This work was supported by the National Natural Science Foundation under Grant 61671416 and Grant 61801447. This brief was recommended by Associate Editor Q. Liu. (Corresponding author: Xianling Liang.) Liang Liu, Xianling Liang, Ronghong Jin, and Junping Geng are with the Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China (e-mail: liangxl@sjtu.edu.cn).
Publisher Copyright:
© 2004-2012 IEEE.
PY - 2021/7
Y1 - 2021/7
N2 - This brief presented a wideband bandstop filter (WBBSF) with compact size and five transmission zeros, which is based on a symmetrical three-layer ring structure comprising equivalently high-impedance phase-shift section, coupled lines, and short-stubs. The WBBSF based on multi-mode resonators can be directly synthesized from the desired rejection, and its transmission zeros and bandwidth are controlled by only two characteristic impedances. For validation, the calculations, simulations, and measurements have also been done for wideband bandstop filter. Good agreements among the calculated, simulated, and measured results are observed.
AB - This brief presented a wideband bandstop filter (WBBSF) with compact size and five transmission zeros, which is based on a symmetrical three-layer ring structure comprising equivalently high-impedance phase-shift section, coupled lines, and short-stubs. The WBBSF based on multi-mode resonators can be directly synthesized from the desired rejection, and its transmission zeros and bandwidth are controlled by only two characteristic impedances. For validation, the calculations, simulations, and measurements have also been done for wideband bandstop filter. Good agreements among the calculated, simulated, and measured results are observed.
KW - Coupled stub-loaded resonator
KW - Couplings
KW - directly controlled rejection
KW - Equivalent circuits
KW - equivalently high-impedance phase-shift section
KW - Filtering theory
KW - Impedance
KW - odd-and even-mode analysis
KW - Resonators
KW - Shunts (electrical)
KW - Wideband
KW - wideband bandstop filter.
UR - http://www.scopus.com/inward/record.url?scp=85099200535&partnerID=8YFLogxK
U2 - 10.1109/TCSII.2021.3049693
DO - 10.1109/TCSII.2021.3049693
M3 - Article
AN - SCOPUS:85099200535
VL - 68
SP - 2282
EP - 2286
JO - IEEE Transactions on Circuits and Systems II: Express Briefs
JF - IEEE Transactions on Circuits and Systems II: Express Briefs
SN - 1549-7747
IS - 7
ER -