An Effective Method for Designing Bandpass Filters Using λ/4 Resonators for Improving Out-of-Band Characteristics

Kouji WADA; Tomohide KAMIYAMA; Osamu HASHIMOTO

An Effective Method for Designing Bandpass Filters Using λ/4 Resonators for Improving Out-of-Band Characteristics

Kouji WADA, Tomohide KAMIYAMA, Osamu HASHIMOTO

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A design methodology of bandpass filters (BPFs) using λ/4 resonators for improving out-of-band characteristics is proposed. Firstly, the basic characteristics of various λ/4 resonators are examined. In this study, we focus on four types of λ/4 resonators, i.e., (1) direct-coupled λ/4 resonator, (2) loaded-element λ/4 resonator, (3) tapped λ/4 resonator and (4) loaded-element tapped λ/4 resonator. Secondly, the application examples of BPFs with improved out-of-band characteristics are provided. We examine the improvement of filter characteristics, i.e., sharp skirt characteristics and low spurious responses. The results of this study lead us to the conclusion that the methodology is very useful for improving the out-of-band characteristics of the BPFs using the λ/4 resonators.

Publication: IEICE TRANSACTIONS on Electronics Vol.E86-C No.2 pp.150-161

Publication Date: 2003/02/01

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Type of Manuscript: Special Section PAPER (Special Issue on Circuit and Device Technology for High-Speed Wireless Communication)

Category: Passive (Filter)

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Kouji WADA, Tomohide KAMIYAMA, Osamu HASHIMOTO, "An Effective Method for Designing Bandpass Filters Using λ/4 Resonators for Improving Out-of-Band Characteristics" in IEICE TRANSACTIONS on Electronics, vol. E86-C, no. 2, pp. 150-161, February 2003, doi: .
Abstract: A design methodology of bandpass filters (BPFs) using λ/4 resonators for improving out-of-band characteristics is proposed. Firstly, the basic characteristics of various λ/4 resonators are examined. In this study, we focus on four types of λ/4 resonators, i.e., (1) direct-coupled λ/4 resonator, (2) loaded-element λ/4 resonator, (3) tapped λ/4 resonator and (4) loaded-element tapped λ/4 resonator. Secondly, the application examples of BPFs with improved out-of-band characteristics are provided. We examine the improvement of filter characteristics, i.e., sharp skirt characteristics and low spurious responses. The results of this study lead us to the conclusion that the methodology is very useful for improving the out-of-band characteristics of the BPFs using the λ/4 resonators.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/e86-c_2_150/_p

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@ARTICLE{e86-c_2_150,
author={Kouji WADA, Tomohide KAMIYAMA, Osamu HASHIMOTO, },
journal={IEICE TRANSACTIONS on Electronics},
title={An Effective Method for Designing Bandpass Filters Using λ/4 Resonators for Improving Out-of-Band Characteristics},
year={2003},
volume={E86-C},
number={2},
pages={150-161},
abstract={A design methodology of bandpass filters (BPFs) using λ/4 resonators for improving out-of-band characteristics is proposed. Firstly, the basic characteristics of various λ/4 resonators are examined. In this study, we focus on four types of λ/4 resonators, i.e., (1) direct-coupled λ/4 resonator, (2) loaded-element λ/4 resonator, (3) tapped λ/4 resonator and (4) loaded-element tapped λ/4 resonator. Secondly, the application examples of BPFs with improved out-of-band characteristics are provided. We examine the improvement of filter characteristics, i.e., sharp skirt characteristics and low spurious responses. The results of this study lead us to the conclusion that the methodology is very useful for improving the out-of-band characteristics of the BPFs using the λ/4 resonators.},
keywords={},
doi={},
ISSN={},
month={February},}

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TY - JOUR
TI - An Effective Method for Designing Bandpass Filters Using λ/4 Resonators for Improving Out-of-Band Characteristics
T2 - IEICE TRANSACTIONS on Electronics
SP - 150
EP - 161
AU - Kouji WADA
AU - Tomohide KAMIYAMA
AU - Osamu HASHIMOTO
PY - 2003
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E86-C
IS - 2
JA - IEICE TRANSACTIONS on Electronics
Y1 - February 2003
AB - A design methodology of bandpass filters (BPFs) using λ/4 resonators for improving out-of-band characteristics is proposed. Firstly, the basic characteristics of various λ/4 resonators are examined. In this study, we focus on four types of λ/4 resonators, i.e., (1) direct-coupled λ/4 resonator, (2) loaded-element λ/4 resonator, (3) tapped λ/4 resonator and (4) loaded-element tapped λ/4 resonator. Secondly, the application examples of BPFs with improved out-of-band characteristics are provided. We examine the improvement of filter characteristics, i.e., sharp skirt characteristics and low spurious responses. The results of this study lead us to the conclusion that the methodology is very useful for improving the out-of-band characteristics of the BPFs using the λ/4 resonators.
ER -