Miniature Microstrip Bandpass Filters Based on Capacitive Loaded Coupled-Lines and Lumped-Element K-Inverters

Yo-Shen LIN; Chien-Chun CHENG

doi:10.1093/ietele/e90-c.12.2218

Miniature Microstrip Bandpass Filters Based on Capacitive Loaded Coupled-Lines and Lumped-Element K-Inverters

Yo-Shen LIN, Chien-Chun CHENG

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This study presents a class of miniature parallel-coupled bandpass filters with good selectivity and stopband rejection. Capacitive terminations are introduced to the conventional anti-parallel coupled-lines, and lumped-element K-inverters are employed, to achieve both size reduction and spurious suppression. Additionally, the capacitive cross-coupling effect can be introduced to obtain three transmission zeros to enhance the selectivity. Suitable equivalent-circuit models, along with design formulae, are also established. Specifically, via design examples, this work demonstrates the feasibility of proposed filter structures in microstrip configuration. Compared to the conventional parallel-coupled filters, the proposed filters exhibit over 60% size reduction, improved selectivity, and wider stopbands up to four times the center frequency.

Publication: IEICE TRANSACTIONS on Electronics Vol.E90-C No.12 pp.2218-2225

Publication Date: 2007/12/01

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Online ISSN: 1745-1353

DOI: 10.1093/ietele/e90-c.12.2218

Type of Manuscript: Special Section PAPER (Special Section on Recent Technologies for Microwave and Millimeter-wave Passive Devices)

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Yo-Shen LIN, Chien-Chun CHENG, "Miniature Microstrip Bandpass Filters Based on Capacitive Loaded Coupled-Lines and Lumped-Element K-Inverters" in IEICE TRANSACTIONS on Electronics, vol. E90-C, no. 12, pp. 2218-2225, December 2007, doi: 10.1093/ietele/e90-c.12.2218.
Abstract: This study presents a class of miniature parallel-coupled bandpass filters with good selectivity and stopband rejection. Capacitive terminations are introduced to the conventional anti-parallel coupled-lines, and lumped-element K-inverters are employed, to achieve both size reduction and spurious suppression. Additionally, the capacitive cross-coupling effect can be introduced to obtain three transmission zeros to enhance the selectivity. Suitable equivalent-circuit models, along with design formulae, are also established. Specifically, via design examples, this work demonstrates the feasibility of proposed filter structures in microstrip configuration. Compared to the conventional parallel-coupled filters, the proposed filters exhibit over 60% size reduction, improved selectivity, and wider stopbands up to four times the center frequency.
URL: https://globals.ieice.org/en_transactions/electronics/10.1093/ietele/e90-c.12.2218/_p

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@ARTICLE{e90-c_12_2218,
author={Yo-Shen LIN, Chien-Chun CHENG, },
journal={IEICE TRANSACTIONS on Electronics},
title={Miniature Microstrip Bandpass Filters Based on Capacitive Loaded Coupled-Lines and Lumped-Element K-Inverters},
year={2007},
volume={E90-C},
number={12},
pages={2218-2225},
abstract={This study presents a class of miniature parallel-coupled bandpass filters with good selectivity and stopband rejection. Capacitive terminations are introduced to the conventional anti-parallel coupled-lines, and lumped-element K-inverters are employed, to achieve both size reduction and spurious suppression. Additionally, the capacitive cross-coupling effect can be introduced to obtain three transmission zeros to enhance the selectivity. Suitable equivalent-circuit models, along with design formulae, are also established. Specifically, via design examples, this work demonstrates the feasibility of proposed filter structures in microstrip configuration. Compared to the conventional parallel-coupled filters, the proposed filters exhibit over 60% size reduction, improved selectivity, and wider stopbands up to four times the center frequency.},
keywords={},
doi={10.1093/ietele/e90-c.12.2218},
ISSN={1745-1353},
month={December},}

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TY - JOUR
TI - Miniature Microstrip Bandpass Filters Based on Capacitive Loaded Coupled-Lines and Lumped-Element K-Inverters
T2 - IEICE TRANSACTIONS on Electronics
SP - 2218
EP - 2225
AU - Yo-Shen LIN
AU - Chien-Chun CHENG
PY - 2007
DO - 10.1093/ietele/e90-c.12.2218
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E90-C
IS - 12
JA - IEICE TRANSACTIONS on Electronics
Y1 - December 2007
AB - This study presents a class of miniature parallel-coupled bandpass filters with good selectivity and stopband rejection. Capacitive terminations are introduced to the conventional anti-parallel coupled-lines, and lumped-element K-inverters are employed, to achieve both size reduction and spurious suppression. Additionally, the capacitive cross-coupling effect can be introduced to obtain three transmission zeros to enhance the selectivity. Suitable equivalent-circuit models, along with design formulae, are also established. Specifically, via design examples, this work demonstrates the feasibility of proposed filter structures in microstrip configuration. Compared to the conventional parallel-coupled filters, the proposed filters exhibit over 60% size reduction, improved selectivity, and wider stopbands up to four times the center frequency.
ER -