Wide-stopband microstrip bandpass filters using dissimilar quarter-wavelength stepped-impedance resonators

Shih Cheng Lin; Pu Hua Deng; Yo Shen Lin; Chi Hsueh Wang; Chun Hsiung Chen

doi:10.1109/TMTT.2005.864139

Wide-stopband microstrip bandpass filters using dissimilar quarter-wavelength stepped-impedance resonators

Shih Cheng Lin, Pu Hua Deng, Yo Shen Lin, Chi Hsueh Wang, Chun Hsiung Chen

Department of Electrical Engineering

Research output: Contribution to journal › Article › peer-review

166 Scopus citations

Abstract

Wide-stopband and compact microstrip bandpass filters (BPFs) are proposed using various dissimilar quarter-wavelength (A/4) stepped-impedance resonators (SIRs) for multiple spurious suppression. The use of λ/4 SIRs is essential in widening the filter stopband and reducing the circuit size. By properly arranging the individual λ/4 SIR, which has the same fundamental resonance frequency f ₀, but has different spurious (harmonic) resonance frequencies, and also carefully misaligning the maximum current density nodes, several higher order spurious resonances may be suppressed so that a BPF with wide stopband may be realized. In this study, the basic concept of multiple spurious suppression is demonstrated by thoroughly investigating the spurious characteristics of the fourth-order interdigital BPFs, which consist of two different types of λ/4 SIRs. To widen the rejection bandwidth, the fourth-order coupled-resonator BPFs based on three and four different types of λ/4 SIRs are implemented and carefully examined. Specifically, a very wide-stopband microstrip BPF composed of four dissimilar λ/4 SIRs is realized and its stopband is extended even up to 11.4 f ₀ with a rejection level better than 27.5 dB.

Original language	English
Pages (from-to)	1011-1017
Number of pages	7
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	54
Issue number	3
DOIs	https://doi.org/10.1109/TMTT.2005.864139
State	Published - Mar 2006

Keywords

Bandpass filter (BPF)
Coupled resonator
Microstrip
Quarter-wavelength stepped-impedance resonator
Spurious suppression

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10.1109/TMTT.2005.864139

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title = "Wide-stopband microstrip bandpass filters using dissimilar quarter-wavelength stepped-impedance resonators",

abstract = "Wide-stopband and compact microstrip bandpass filters (BPFs) are proposed using various dissimilar quarter-wavelength (A/4) stepped-impedance resonators (SIRs) for multiple spurious suppression. The use of λ/4 SIRs is essential in widening the filter stopband and reducing the circuit size. By properly arranging the individual λ/4 SIR, which has the same fundamental resonance frequency f 0, but has different spurious (harmonic) resonance frequencies, and also carefully misaligning the maximum current density nodes, several higher order spurious resonances may be suppressed so that a BPF with wide stopband may be realized. In this study, the basic concept of multiple spurious suppression is demonstrated by thoroughly investigating the spurious characteristics of the fourth-order interdigital BPFs, which consist of two different types of λ/4 SIRs. To widen the rejection bandwidth, the fourth-order coupled-resonator BPFs based on three and four different types of λ/4 SIRs are implemented and carefully examined. Specifically, a very wide-stopband microstrip BPF composed of four dissimilar λ/4 SIRs is realized and its stopband is extended even up to 11.4 f 0 with a rejection level better than 27.5 dB.",

keywords = "Bandpass filter (BPF), Coupled resonator, Microstrip, Quarter-wavelength stepped-impedance resonator, Spurious suppression",

author = "Lin, {Shih Cheng} and Deng, {Pu Hua} and Lin, {Yo Shen} and Wang, {Chi Hsueh} and Chen, {Chun Hsiung}",

note = "Funding Information: Manuscript received May 17, 2005; revised November 13, 2005. This work was supported by the National Science Council of Taiwan under Grant NSC 93-2752-E-002-001-PAE and Grant NSC 93-2219-E-002-021.",

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AU - Deng, Pu Hua

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AU - Wang, Chi Hsueh

AU - Chen, Chun Hsiung

N1 - Funding Information: Manuscript received May 17, 2005; revised November 13, 2005. This work was supported by the National Science Council of Taiwan under Grant NSC 93-2752-E-002-001-PAE and Grant NSC 93-2219-E-002-021.

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AB - Wide-stopband and compact microstrip bandpass filters (BPFs) are proposed using various dissimilar quarter-wavelength (A/4) stepped-impedance resonators (SIRs) for multiple spurious suppression. The use of λ/4 SIRs is essential in widening the filter stopband and reducing the circuit size. By properly arranging the individual λ/4 SIR, which has the same fundamental resonance frequency f 0, but has different spurious (harmonic) resonance frequencies, and also carefully misaligning the maximum current density nodes, several higher order spurious resonances may be suppressed so that a BPF with wide stopband may be realized. In this study, the basic concept of multiple spurious suppression is demonstrated by thoroughly investigating the spurious characteristics of the fourth-order interdigital BPFs, which consist of two different types of λ/4 SIRs. To widen the rejection bandwidth, the fourth-order coupled-resonator BPFs based on three and four different types of λ/4 SIRs are implemented and carefully examined. Specifically, a very wide-stopband microstrip BPF composed of four dissimilar λ/4 SIRs is realized and its stopband is extended even up to 11.4 f 0 with a rejection level better than 27.5 dB.

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Wide-stopband microstrip bandpass filters using dissimilar quarter-wavelength stepped-impedance resonators

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Keywords

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