Compact single-pole-double-throw switchable bandpass filter based on multicoupled line

Chang Sheng Chen; Jian Fong Wu; Yo Shen Lin

doi:10.1109/LMWC.2013.2290212

Compact single-pole-double-throw switchable bandpass filter based on multicoupled line

Chang Sheng Chen, Jian Fong Wu, Yo Shen Lin

Department of Electrical Engineering

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

51 Scopus citations

Abstract

A compact single-pole-double-throw (SPDT) switchable bandpass filter (BPF) composed of capacitively loaded multicoupled line is proposed. By replacing the quarter-wavelength impedance transformer at the common junction in conventional designs with a J-inverter, the circuit size is largely reduced and the design procedure is much simplified. As a demonstration, a proposed SPDT switchable BPF is designed and implemented with a center frequency f₀ of 1.0 GHz and a bandwidth of about 10%. Low insertion loss in the on state, good isolation in the off state, and good linearity are obtained. The filter size without bias circuits and input/output traces is only 2.5 cm × 2.7 cm, which is about 0.158λ_g × 0.170 λ_g at f₀.

Original language	English
Article number	6679292
Pages (from-to)	87-89
Number of pages	3
Journal	IEEE Microwave and Wireless Components Letters
Volume	24
Issue number	2
DOIs	https://doi.org/10.1109/LMWC.2013.2290212
State	Published - Feb 2014

Keywords

Bandpass filter (BPF)
single-pole-double-throw
switch

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10.1109/LMWC.2013.2290212

Cite this

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title = "Compact single-pole-double-throw switchable bandpass filter based on multicoupled line",

abstract = "A compact single-pole-double-throw (SPDT) switchable bandpass filter (BPF) composed of capacitively loaded multicoupled line is proposed. By replacing the quarter-wavelength impedance transformer at the common junction in conventional designs with a J-inverter, the circuit size is largely reduced and the design procedure is much simplified. As a demonstration, a proposed SPDT switchable BPF is designed and implemented with a center frequency f0 of 1.0 GHz and a bandwidth of about 10%. Low insertion loss in the on state, good isolation in the off state, and good linearity are obtained. The filter size without bias circuits and input/output traces is only 2.5 cm × 2.7 cm, which is about 0.158λg × 0.170 λg at f0.",

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N2 - A compact single-pole-double-throw (SPDT) switchable bandpass filter (BPF) composed of capacitively loaded multicoupled line is proposed. By replacing the quarter-wavelength impedance transformer at the common junction in conventional designs with a J-inverter, the circuit size is largely reduced and the design procedure is much simplified. As a demonstration, a proposed SPDT switchable BPF is designed and implemented with a center frequency f0 of 1.0 GHz and a bandwidth of about 10%. Low insertion loss in the on state, good isolation in the off state, and good linearity are obtained. The filter size without bias circuits and input/output traces is only 2.5 cm × 2.7 cm, which is about 0.158λg × 0.170 λg at f0.

AB - A compact single-pole-double-throw (SPDT) switchable bandpass filter (BPF) composed of capacitively loaded multicoupled line is proposed. By replacing the quarter-wavelength impedance transformer at the common junction in conventional designs with a J-inverter, the circuit size is largely reduced and the design procedure is much simplified. As a demonstration, a proposed SPDT switchable BPF is designed and implemented with a center frequency f0 of 1.0 GHz and a bandwidth of about 10%. Low insertion loss in the on state, good isolation in the off state, and good linearity are obtained. The filter size without bias circuits and input/output traces is only 2.5 cm × 2.7 cm, which is about 0.158λg × 0.170 λg at f0.

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KW - single-pole-double-throw

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JF - IEEE Microwave and Wireless Components Letters

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Compact single-pole-double-throw switchable bandpass filter based on multicoupled line

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Keywords

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