Novel Design of Microstrip Bandpass Filters with a Controllable Dual-Passband Response: Description and Implementation

Sheng SUN; Lei ZHU

doi:10.1093/ietele/e89-c.2.197

Novel Design of Microstrip Bandpass Filters with a Controllable Dual-Passband Response: Description and Implementation

Sheng SUN, Lei ZHU

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Novel microstrip dual-band bandpass filters with controllable fractional bandwidths and good in-between isolation are presented and implemented. A half-wavelength stepped-impedance resonator is firstly characterized, aiming at producing the two resonant frequencies at 2.4 and 5.2 GHz. Two types of coupled microstrip lines in the parallel and anti-parallel formats are then investigated in terms of unified equivalent J-inverter network. Extensive results are derived to quantitatively show their distinctive frequency-distributed coupling performances under different coupling lengths. The coupling degrees of these two coupled lines at the two resonances are properly adjusted to achieve the dual-passband response with varied or tunable bandwidths. In addition, the parallel coupled line is modeled to bring out a transmission zero between the two resonances so as to achieve the good in-between isolation. The three two-stage bandpass filters are initially designed to exhibit their dual-band response with changeable dual-band bandwidths. A three-stage dual-band filter is in final optimally designed and its predicted performance is confirmed in experiment.

Publication: IEICE TRANSACTIONS on Electronics Vol.E89-C No.2 pp.197-202

Publication Date: 2006/02/01

Publicized

Online ISSN: 1745-1353

DOI: 10.1093/ietele/e89-c.2.197

Type of Manuscript: PAPER

Category: Microwaves, Millimeter-Waves

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Sheng SUN, Lei ZHU, "Novel Design of Microstrip Bandpass Filters with a Controllable Dual-Passband Response: Description and Implementation" in IEICE TRANSACTIONS on Electronics, vol. E89-C, no. 2, pp. 197-202, February 2006, doi: 10.1093/ietele/e89-c.2.197.
Abstract: Novel microstrip dual-band bandpass filters with controllable fractional bandwidths and good in-between isolation are presented and implemented. A half-wavelength stepped-impedance resonator is firstly characterized, aiming at producing the two resonant frequencies at 2.4 and 5.2 GHz. Two types of coupled microstrip lines in the parallel and anti-parallel formats are then investigated in terms of unified equivalent J-inverter network. Extensive results are derived to quantitatively show their distinctive frequency-distributed coupling performances under different coupling lengths. The coupling degrees of these two coupled lines at the two resonances are properly adjusted to achieve the dual-passband response with varied or tunable bandwidths. In addition, the parallel coupled line is modeled to bring out a transmission zero between the two resonances so as to achieve the good in-between isolation. The three two-stage bandpass filters are initially designed to exhibit their dual-band response with changeable dual-band bandwidths. A three-stage dual-band filter is in final optimally designed and its predicted performance is confirmed in experiment.
URL: https://global.ieice.org/en_transactions/electronics/10.1093/ietele/e89-c.2.197/_p

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@ARTICLE{e89-c_2_197,
author={Sheng SUN, Lei ZHU, },
journal={IEICE TRANSACTIONS on Electronics},
title={Novel Design of Microstrip Bandpass Filters with a Controllable Dual-Passband Response: Description and Implementation},
year={2006},
volume={E89-C},
number={2},
pages={197-202},
abstract={Novel microstrip dual-band bandpass filters with controllable fractional bandwidths and good in-between isolation are presented and implemented. A half-wavelength stepped-impedance resonator is firstly characterized, aiming at producing the two resonant frequencies at 2.4 and 5.2 GHz. Two types of coupled microstrip lines in the parallel and anti-parallel formats are then investigated in terms of unified equivalent J-inverter network. Extensive results are derived to quantitatively show their distinctive frequency-distributed coupling performances under different coupling lengths. The coupling degrees of these two coupled lines at the two resonances are properly adjusted to achieve the dual-passband response with varied or tunable bandwidths. In addition, the parallel coupled line is modeled to bring out a transmission zero between the two resonances so as to achieve the good in-between isolation. The three two-stage bandpass filters are initially designed to exhibit their dual-band response with changeable dual-band bandwidths. A three-stage dual-band filter is in final optimally designed and its predicted performance is confirmed in experiment.},
keywords={},
doi={10.1093/ietele/e89-c.2.197},
ISSN={1745-1353},
month={February},}

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TY - JOUR
TI - Novel Design of Microstrip Bandpass Filters with a Controllable Dual-Passband Response: Description and Implementation
T2 - IEICE TRANSACTIONS on Electronics
SP - 197
EP - 202
AU - Sheng SUN
AU - Lei ZHU
PY - 2006
DO - 10.1093/ietele/e89-c.2.197
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E89-C
IS - 2
JA - IEICE TRANSACTIONS on Electronics
Y1 - February 2006
AB - Novel microstrip dual-band bandpass filters with controllable fractional bandwidths and good in-between isolation are presented and implemented. A half-wavelength stepped-impedance resonator is firstly characterized, aiming at producing the two resonant frequencies at 2.4 and 5.2 GHz. Two types of coupled microstrip lines in the parallel and anti-parallel formats are then investigated in terms of unified equivalent J-inverter network. Extensive results are derived to quantitatively show their distinctive frequency-distributed coupling performances under different coupling lengths. The coupling degrees of these two coupled lines at the two resonances are properly adjusted to achieve the dual-passband response with varied or tunable bandwidths. In addition, the parallel coupled line is modeled to bring out a transmission zero between the two resonances so as to achieve the good in-between isolation. The three two-stage bandpass filters are initially designed to exhibit their dual-band response with changeable dual-band bandwidths. A three-stage dual-band filter is in final optimally designed and its predicted performance is confirmed in experiment.
ER -