Design of microstrip bandpass filters with a dual-passband response

Jen Tsai Kuo; Tsung Hsun Yeh; Chun Cheng Yeh

doi:10.1109/TMTT.2005.845765

Design of microstrip bandpass filters with a dual-passband response

Jen Tsai Kuo^*, Tsung Hsun Yeh, Chun Cheng Yeh

^*Corresponding author for this work

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

332 Scopus citations

Abstract

This paper presents a rigorous design of microstrip bandpass filters with a dual-passband response in parallel-coupled and vertical-stacked configurations. Based on resonance characteristics of a stepped impedance resonator (SIR), the second resonant frequency can be tuned over a wide range by adjusting its structure parameters. Emphasis is placed on filter synthesis for simultaneously matching in-band response and singly loaded Q by using tapped input/output couplings for the two designated passbands. Fractional bandwidth design graphs are used to determine proper geometric parameters of each coupled stage when filter specification is given. Realizable fractional bandwidths of the two passbands for a coupled SIR structure are clearly depicted in fractional bandwidth design graphs. Several experimental filters are fabricated and measured to demonstrate the design.

Original language	English
Pages (from-to)	1331-1336
Number of pages	6
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	53
Issue number	4 I
DOIs	https://doi.org/10.1109/TMTT.2005.845765
State	Published - 04 2005
Externally published	Yes

Keywords

Dual-passband
Microstrip circuit
Planar microwave filters
Stepped impedance resonator (SIR)

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10.1109/TMTT.2005.845765

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title = "Design of microstrip bandpass filters with a dual-passband response",

abstract = "This paper presents a rigorous design of microstrip bandpass filters with a dual-passband response in parallel-coupled and vertical-stacked configurations. Based on resonance characteristics of a stepped impedance resonator (SIR), the second resonant frequency can be tuned over a wide range by adjusting its structure parameters. Emphasis is placed on filter synthesis for simultaneously matching in-band response and singly loaded Q by using tapped input/output couplings for the two designated passbands. Fractional bandwidth design graphs are used to determine proper geometric parameters of each coupled stage when filter specification is given. Realizable fractional bandwidths of the two passbands for a coupled SIR structure are clearly depicted in fractional bandwidth design graphs. Several experimental filters are fabricated and measured to demonstrate the design.",

keywords = "Dual-passband, Microstrip circuit, Planar microwave filters, Stepped impedance resonator (SIR)",

author = "Kuo, {Jen Tsai} and Yeh, {Tsung Hsun} and Yeh, {Chun Cheng}",

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doi = "10.1109/TMTT.2005.845765",

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N2 - This paper presents a rigorous design of microstrip bandpass filters with a dual-passband response in parallel-coupled and vertical-stacked configurations. Based on resonance characteristics of a stepped impedance resonator (SIR), the second resonant frequency can be tuned over a wide range by adjusting its structure parameters. Emphasis is placed on filter synthesis for simultaneously matching in-band response and singly loaded Q by using tapped input/output couplings for the two designated passbands. Fractional bandwidth design graphs are used to determine proper geometric parameters of each coupled stage when filter specification is given. Realizable fractional bandwidths of the two passbands for a coupled SIR structure are clearly depicted in fractional bandwidth design graphs. Several experimental filters are fabricated and measured to demonstrate the design.

AB - This paper presents a rigorous design of microstrip bandpass filters with a dual-passband response in parallel-coupled and vertical-stacked configurations. Based on resonance characteristics of a stepped impedance resonator (SIR), the second resonant frequency can be tuned over a wide range by adjusting its structure parameters. Emphasis is placed on filter synthesis for simultaneously matching in-band response and singly loaded Q by using tapped input/output couplings for the two designated passbands. Fractional bandwidth design graphs are used to determine proper geometric parameters of each coupled stage when filter specification is given. Realizable fractional bandwidths of the two passbands for a coupled SIR structure are clearly depicted in fractional bandwidth design graphs. Several experimental filters are fabricated and measured to demonstrate the design.

KW - Dual-passband

KW - Microstrip circuit

KW - Planar microwave filters

KW - Stepped impedance resonator (SIR)

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Design of microstrip bandpass filters with a dual-passband response

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