Microstrip stepped impedance resonator bandpass filter with an extended optimal rejection bandwidth

Jen Tsai Kuo; Eric Shih

doi:10.1109/TMTT.2003.810138

Microstrip stepped impedance resonator bandpass filter with an extended optimal rejection bandwidth

Jen Tsai Kuo, Eric Shih

National Yang Ming Chiao Tung University

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

364 Scopus citations

Abstract

Bandpass filters with an optimal rejection bandwidth are designed using parallel-coupled stepped impedance resonators (SIRs). The fundamental (f_o) and higher order resonant harmonics of an SIR are analyzed against the length ratio of the high-Z and low-Z segments. It is found that an optimal length ratio can be obtained for each high-Z to low-Z impedance ratio to maximize the upper rejection bandwidth. A tapped-line input/output structure is exploited to create two extra transmission zeros in the stopband. The singly loaded Q(Q_si) of a tapped SIR is derived. With the aid of Q_si, the two zeros can be independently tuned over a wide frequency range. When the positions of the two zeros are purposely located at the two leading higher order harmonics, the upper rejection band can be greatly extended. Chebyshev bandpass filters with spurious resonances up to 4.4f_o, 6.5f_o, and 8.2f_o are fabricated and measured to demonstrate the idea.

Original language	English
Pages (from-to)	1554-1559
Number of pages	6
Journal	IEEE Transactions on Microwave Theory and Techniques
Volume	51
Issue number	5
DOIs	https://doi.org/10.1109/TMTT.2003.810138
State	Published - 05 2003
Externally published	Yes

Keywords

Microstrip
Microwave filter
Spurious response
Stepped impedance resonator (SIR)
Transmission zero

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10.1109/TMTT.2003.810138

Cite this

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title = "Microstrip stepped impedance resonator bandpass filter with an extended optimal rejection bandwidth",

abstract = "Bandpass filters with an optimal rejection bandwidth are designed using parallel-coupled stepped impedance resonators (SIRs). The fundamental (fo) and higher order resonant harmonics of an SIR are analyzed against the length ratio of the high-Z and low-Z segments. It is found that an optimal length ratio can be obtained for each high-Z to low-Z impedance ratio to maximize the upper rejection bandwidth. A tapped-line input/output structure is exploited to create two extra transmission zeros in the stopband. The singly loaded Q(Qsi) of a tapped SIR is derived. With the aid of Qsi, the two zeros can be independently tuned over a wide frequency range. When the positions of the two zeros are purposely located at the two leading higher order harmonics, the upper rejection band can be greatly extended. Chebyshev bandpass filters with spurious resonances up to 4.4fo, 6.5fo, and 8.2fo are fabricated and measured to demonstrate the idea.",

keywords = "Microstrip, Microwave filter, Spurious response, Stepped impedance resonator (SIR), Transmission zero",

author = "Kuo, \{Jen Tsai\} and Eric Shih",

year = "2003",

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doi = "10.1109/TMTT.2003.810138",

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AU - Kuo, Jen Tsai

AU - Shih, Eric

PY - 2003/5

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N2 - Bandpass filters with an optimal rejection bandwidth are designed using parallel-coupled stepped impedance resonators (SIRs). The fundamental (fo) and higher order resonant harmonics of an SIR are analyzed against the length ratio of the high-Z and low-Z segments. It is found that an optimal length ratio can be obtained for each high-Z to low-Z impedance ratio to maximize the upper rejection bandwidth. A tapped-line input/output structure is exploited to create two extra transmission zeros in the stopband. The singly loaded Q(Qsi) of a tapped SIR is derived. With the aid of Qsi, the two zeros can be independently tuned over a wide frequency range. When the positions of the two zeros are purposely located at the two leading higher order harmonics, the upper rejection band can be greatly extended. Chebyshev bandpass filters with spurious resonances up to 4.4fo, 6.5fo, and 8.2fo are fabricated and measured to demonstrate the idea.

AB - Bandpass filters with an optimal rejection bandwidth are designed using parallel-coupled stepped impedance resonators (SIRs). The fundamental (fo) and higher order resonant harmonics of an SIR are analyzed against the length ratio of the high-Z and low-Z segments. It is found that an optimal length ratio can be obtained for each high-Z to low-Z impedance ratio to maximize the upper rejection bandwidth. A tapped-line input/output structure is exploited to create two extra transmission zeros in the stopband. The singly loaded Q(Qsi) of a tapped SIR is derived. With the aid of Qsi, the two zeros can be independently tuned over a wide frequency range. When the positions of the two zeros are purposely located at the two leading higher order harmonics, the upper rejection band can be greatly extended. Chebyshev bandpass filters with spurious resonances up to 4.4fo, 6.5fo, and 8.2fo are fabricated and measured to demonstrate the idea.

KW - Microstrip

KW - Microwave filter

KW - Spurious response

KW - Stepped impedance resonator (SIR)

KW - Transmission zero

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Microstrip stepped impedance resonator bandpass filter with an extended optimal rejection bandwidth

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Keywords

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