Design of A Wideband Filter With Attenuation Poles Using A Novel Parallel-Coupled Three-line Unit Based on Cross-Coupling

Chun-Ping CHEN; Junya ODA; Tetsuo ANADA

doi:10.1587/transele.E97.C.689

Design of A Wideband Filter With Attenuation Poles Using A Novel Parallel-Coupled Three-line Unit Based on Cross-Coupling

Chun-Ping CHEN, Junya ODA, Tetsuo ANADA

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To implement a wideband bandpass filter with improved skirt-selectivity and out-band characteristics, a new parallel-coupled three-line unit with two short-circuited stubs symmetrically-loaded at the center line is proposed. Unlike most traditional ones, the passband of the proposed parallel-coupled three-line structure is based on the cross-coupling between non-adjacent lines rather than the direct-coupling between adjacent ones, whereas a pair of attenuation poles is found in the stopbands. After revealing its work mechanism, an efficient filter-design-scheme is correspondingly proposed for the presented structure. Firstly, based on a chebyshev-filter synthesis theory, a wideband passband filter consisting of a parallel-coupled two-line and two short-circuited stubs loaded at the input- and output- ports is designed. Furthermore, by putting a properly-designed 3/4-wavelength stepped-impedance resonator (SIR) in between the parallel-coupled two lines, two attenuation poles are then realized at the frequencies very close to the cutoff ones. Accordingly, the roll-off characteristics of the filter are significantly-improved to greater than 100 dB/GHz. Furthermore, two-section open-ended stubs are used to replace the short-circuited ones to realize a pair of extra attenuation poles in stopbands. To validate the proposed techniques, a wideband filter with a bandwidth of 3-5 GHz (Fractional bandwidth (FBW) = (5 GHz-3 GHz)/4 GHz =50%) was designed, simulated, fabricated and measured. The measured responses of the filter agree well with the simulation and theoretical ones, which validates the effectiveness of the newly-proposed three-line unit and the corresponding design scheme.

Publication: IEICE TRANSACTIONS on Electronics Vol.E97-C No.7 pp.689-696

Publication Date: 2014/07/01

Publicized

Online ISSN: 1745-1353

DOI: 10.1587/transele.E97.C.689

Type of Manuscript: Special Section PAPER (Special Section on Recent Advances in Simulation Techniques and Their Applications for Electronics)

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Authors

Chun-Ping CHEN
  Kanagawa University
Junya ODA
  Kanagawa University
Tetsuo ANADA
  Kanagawa University

Keyword

Parallel-coupled Three-Line, Cross-Coupling, Wideband Filter, UWB, Attenuation poles, Steep skirt selectivity, Out-band, Bandpass Filter (BPF)

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Chun-Ping CHEN, Junya ODA, Tetsuo ANADA, "Design of A Wideband Filter With Attenuation Poles Using A Novel Parallel-Coupled Three-line Unit Based on Cross-Coupling" in IEICE TRANSACTIONS on Electronics, vol. E97-C, no. 7, pp. 689-696, July 2014, doi: 10.1587/transele.E97.C.689.
Abstract: To implement a wideband bandpass filter with improved skirt-selectivity and out-band characteristics, a new parallel-coupled three-line unit with two short-circuited stubs symmetrically-loaded at the center line is proposed. Unlike most traditional ones, the passband of the proposed parallel-coupled three-line structure is based on the cross-coupling between non-adjacent lines rather than the direct-coupling between adjacent ones, whereas a pair of attenuation poles is found in the stopbands. After revealing its work mechanism, an efficient filter-design-scheme is correspondingly proposed for the presented structure. Firstly, based on a chebyshev-filter synthesis theory, a wideband passband filter consisting of a parallel-coupled two-line and two short-circuited stubs loaded at the input- and output- ports is designed. Furthermore, by putting a properly-designed 3/4-wavelength stepped-impedance resonator (SIR) in between the parallel-coupled two lines, two attenuation poles are then realized at the frequencies very close to the cutoff ones. Accordingly, the roll-off characteristics of the filter are significantly-improved to greater than 100 dB/GHz. Furthermore, two-section open-ended stubs are used to replace the short-circuited ones to realize a pair of extra attenuation poles in stopbands. To validate the proposed techniques, a wideband filter with a bandwidth of 3-5 GHz (Fractional bandwidth (FBW) = (5 GHz-3 GHz)/4 GHz =50%) was designed, simulated, fabricated and measured. The measured responses of the filter agree well with the simulation and theoretical ones, which validates the effectiveness of the newly-proposed three-line unit and the corresponding design scheme.
URL: https://globals.ieice.org/en_transactions/electronics/10.1587/transele.E97.C.689/_p

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@ARTICLE{e97-c_7_689,
author={Chun-Ping CHEN, Junya ODA, Tetsuo ANADA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Design of A Wideband Filter With Attenuation Poles Using A Novel Parallel-Coupled Three-line Unit Based on Cross-Coupling},
year={2014},
volume={E97-C},
number={7},
pages={689-696},
abstract={To implement a wideband bandpass filter with improved skirt-selectivity and out-band characteristics, a new parallel-coupled three-line unit with two short-circuited stubs symmetrically-loaded at the center line is proposed. Unlike most traditional ones, the passband of the proposed parallel-coupled three-line structure is based on the cross-coupling between non-adjacent lines rather than the direct-coupling between adjacent ones, whereas a pair of attenuation poles is found in the stopbands. After revealing its work mechanism, an efficient filter-design-scheme is correspondingly proposed for the presented structure. Firstly, based on a chebyshev-filter synthesis theory, a wideband passband filter consisting of a parallel-coupled two-line and two short-circuited stubs loaded at the input- and output- ports is designed. Furthermore, by putting a properly-designed 3/4-wavelength stepped-impedance resonator (SIR) in between the parallel-coupled two lines, two attenuation poles are then realized at the frequencies very close to the cutoff ones. Accordingly, the roll-off characteristics of the filter are significantly-improved to greater than 100 dB/GHz. Furthermore, two-section open-ended stubs are used to replace the short-circuited ones to realize a pair of extra attenuation poles in stopbands. To validate the proposed techniques, a wideband filter with a bandwidth of 3-5 GHz (Fractional bandwidth (FBW) = (5 GHz-3 GHz)/4 GHz =50%) was designed, simulated, fabricated and measured. The measured responses of the filter agree well with the simulation and theoretical ones, which validates the effectiveness of the newly-proposed three-line unit and the corresponding design scheme.},
keywords={},
doi={10.1587/transele.E97.C.689},
ISSN={1745-1353},
month={July},}

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TY - JOUR
TI - Design of A Wideband Filter With Attenuation Poles Using A Novel Parallel-Coupled Three-line Unit Based on Cross-Coupling
T2 - IEICE TRANSACTIONS on Electronics
SP - 689
EP - 696
AU - Chun-Ping CHEN
AU - Junya ODA
AU - Tetsuo ANADA
PY - 2014
DO - 10.1587/transele.E97.C.689
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E97-C
IS - 7
JA - IEICE TRANSACTIONS on Electronics
Y1 - July 2014
AB - To implement a wideband bandpass filter with improved skirt-selectivity and out-band characteristics, a new parallel-coupled three-line unit with two short-circuited stubs symmetrically-loaded at the center line is proposed. Unlike most traditional ones, the passband of the proposed parallel-coupled three-line structure is based on the cross-coupling between non-adjacent lines rather than the direct-coupling between adjacent ones, whereas a pair of attenuation poles is found in the stopbands. After revealing its work mechanism, an efficient filter-design-scheme is correspondingly proposed for the presented structure. Firstly, based on a chebyshev-filter synthesis theory, a wideband passband filter consisting of a parallel-coupled two-line and two short-circuited stubs loaded at the input- and output- ports is designed. Furthermore, by putting a properly-designed 3/4-wavelength stepped-impedance resonator (SIR) in between the parallel-coupled two lines, two attenuation poles are then realized at the frequencies very close to the cutoff ones. Accordingly, the roll-off characteristics of the filter are significantly-improved to greater than 100 dB/GHz. Furthermore, two-section open-ended stubs are used to replace the short-circuited ones to realize a pair of extra attenuation poles in stopbands. To validate the proposed techniques, a wideband filter with a bandwidth of 3-5 GHz (Fractional bandwidth (FBW) = (5 GHz-3 GHz)/4 GHz =50%) was designed, simulated, fabricated and measured. The measured responses of the filter agree well with the simulation and theoretical ones, which validates the effectiveness of the newly-proposed three-line unit and the corresponding design scheme.
ER -