A two-stage SIR bandpass filter with an ultra-wide upper rejection band

Ching Luh Hsu; Jen Tsai Kuo

doi:10.1109/LMWC.2006.887248

A two-stage SIR bandpass filter with an ultra-wide upper rejection band

Ching Luh Hsu^*
, Jen Tsai Kuo

^*Corresponding author for this work

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

39 Scopus citations

Abstract

Two-stage stepped-impedance resonator (SIR) filters are designed to have a wide upper stopband. Two transmission zeros are also created near the passband to form a quasi-elliptic response. For a 20-dB rejection level, with properly designed SIR geometry and tapped-line structure, the leading three spurious resonances of the SIR are suppressed by transmission zeros and respective unmatched singly loaded Q (Q_si) values. Measured results illustrate that stopbands up to 8.4 and 5.3 times the design frequency can be achieved for rejection levels of 20 and 30 dB, respectively.

Original language	English
Pages (from-to)	34-36
Number of pages	3
Journal	IEEE Microwave and Wireless Components Letters
Volume	17
Issue number	1
DOIs	https://doi.org/10.1109/LMWC.2006.887248
State	Published - 01 2007
Externally published	Yes

Keywords

Microstrip filter
Rejection
Stepped-impedance resonator (SIR)
Tapped-line
Upper stopband

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10.1109/LMWC.2006.887248

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title = "A two-stage SIR bandpass filter with an ultra-wide upper rejection band",

abstract = "Two-stage stepped-impedance resonator (SIR) filters are designed to have a wide upper stopband. Two transmission zeros are also created near the passband to form a quasi-elliptic response. For a 20-dB rejection level, with properly designed SIR geometry and tapped-line structure, the leading three spurious resonances of the SIR are suppressed by transmission zeros and respective unmatched singly loaded Q (Qsi) values. Measured results illustrate that stopbands up to 8.4 and 5.3 times the design frequency can be achieved for rejection levels of 20 and 30 dB, respectively.",

keywords = "Microstrip filter, Rejection, Stepped-impedance resonator (SIR), Tapped-line, Upper stopband",

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AB - Two-stage stepped-impedance resonator (SIR) filters are designed to have a wide upper stopband. Two transmission zeros are also created near the passband to form a quasi-elliptic response. For a 20-dB rejection level, with properly designed SIR geometry and tapped-line structure, the leading three spurious resonances of the SIR are suppressed by transmission zeros and respective unmatched singly loaded Q (Qsi) values. Measured results illustrate that stopbands up to 8.4 and 5.3 times the design frequency can be achieved for rejection levels of 20 and 30 dB, respectively.

KW - Microstrip filter

KW - Rejection

KW - Stepped-impedance resonator (SIR)

KW - Tapped-line

KW - Upper stopband

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JO - IEEE Microwave and Wireless Components Letters

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A two-stage SIR bandpass filter with an ultra-wide upper rejection band

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Keywords

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