Extended-stopband bandpass filter using both half- and quarter-wavelength resonators

Shih Cheng Lin; Yo Shen Lin; Chun Hsiung Chen

doi:10.1109/LMWC.2005.860014

Extended-stopband bandpass filter using both half- and quarter-wavelength resonators

Shih Cheng Lin, Yo Shen Lin, Chun Hsiung Chen

Department of Electrical Engineering

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

48 Scopus citations

Abstract

A novel quasielliptic microstrip bandpass filter (BPF) using both half- and quarter-wavelength resonators is proposed. With the quarter-wavelength (λ/4) resonators placed in the interstage, the filter spurious passband can be pushed up to 3 f ₀ where f ₀ stands for the passband center frequency. To improve the stopband characteristics, a modified stopband-extended filter is implemented, utilizing the multiple transmission zeros placed at specified frequencies to achieve good frequency selectivity and out-of-band rejection. The modified filter provides a 22.5-dB rejection level from 1.14 f ₀ to 5.2 f ₀.

Original language	English
Pages (from-to)	43-45
Number of pages	3
Journal	IEEE Microwave and Wireless Components Letters
Volume	16
Issue number	1
DOIs	https://doi.org/10.1109/LMWC.2005.860014
State	Published - Jan 2006

Keywords

Cross-coupled bandpass filter (BPF)
Extended stopband
Half-wavelength resonator
Microstrip
Quarter-wave-length resonator

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10.1109/LMWC.2005.860014

Cite this

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title = "Extended-stopband bandpass filter using both half- and quarter-wavelength resonators",

abstract = "A novel quasielliptic microstrip bandpass filter (BPF) using both half- and quarter-wavelength resonators is proposed. With the quarter-wavelength (λ/4) resonators placed in the interstage, the filter spurious passband can be pushed up to 3 f 0 where f 0 stands for the passband center frequency. To improve the stopband characteristics, a modified stopband-extended filter is implemented, utilizing the multiple transmission zeros placed at specified frequencies to achieve good frequency selectivity and out-of-band rejection. The modified filter provides a 22.5-dB rejection level from 1.14 f 0 to 5.2 f 0.",

keywords = "Cross-coupled bandpass filter (BPF), Extended stopband, Half-wavelength resonator, Microstrip, Quarter-wave-length resonator",

author = "Lin, {Shih Cheng} and Lin, {Yo Shen} and Chen, {Chun Hsiung}",

note = "Funding Information: Manuscript received July 21, 2005; revised September 8, 2005. This work was supported by the National Science Council of Taiwan, R.O.C., under Grant NSC 94-2752-E-002-001-PAE and Grant NSC 93-2219-E-002-021. The review of this letter was arranged by Associate Editor J.-G. Ma.",

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AU - Lin, Shih Cheng

AU - Lin, Yo Shen

AU - Chen, Chun Hsiung

N1 - Funding Information: Manuscript received July 21, 2005; revised September 8, 2005. This work was supported by the National Science Council of Taiwan, R.O.C., under Grant NSC 94-2752-E-002-001-PAE and Grant NSC 93-2219-E-002-021. The review of this letter was arranged by Associate Editor J.-G. Ma.

PY - 2006/1

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N2 - A novel quasielliptic microstrip bandpass filter (BPF) using both half- and quarter-wavelength resonators is proposed. With the quarter-wavelength (λ/4) resonators placed in the interstage, the filter spurious passband can be pushed up to 3 f 0 where f 0 stands for the passband center frequency. To improve the stopband characteristics, a modified stopband-extended filter is implemented, utilizing the multiple transmission zeros placed at specified frequencies to achieve good frequency selectivity and out-of-band rejection. The modified filter provides a 22.5-dB rejection level from 1.14 f 0 to 5.2 f 0.

AB - A novel quasielliptic microstrip bandpass filter (BPF) using both half- and quarter-wavelength resonators is proposed. With the quarter-wavelength (λ/4) resonators placed in the interstage, the filter spurious passband can be pushed up to 3 f 0 where f 0 stands for the passband center frequency. To improve the stopband characteristics, a modified stopband-extended filter is implemented, utilizing the multiple transmission zeros placed at specified frequencies to achieve good frequency selectivity and out-of-band rejection. The modified filter provides a 22.5-dB rejection level from 1.14 f 0 to 5.2 f 0.

KW - Cross-coupled bandpass filter (BPF)

KW - Extended stopband

KW - Half-wavelength resonator

KW - Microstrip

KW - Quarter-wave-length resonator

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EP - 45

JO - IEEE Microwave and Wireless Components Letters

JF - IEEE Microwave and Wireless Components Letters

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ER -

Extended-stopband bandpass filter using both half- and quarter-wavelength resonators

Abstract

Keywords

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