Parallel-coupled microstrip filters with over-coupled end stages for suppression of spurious responses

Jen Tsai Kuo; Sin Ping Chen; Meshon Jiang

doi:10.1109/LMWC.2003.818531

Parallel-coupled microstrip filters with over-coupled end stages for suppression of spurious responses

Jen Tsai Kuo^*, Sin Ping Chen, Meshon Jiang

^*Corresponding author for this work

National Yang Ming Chiao Tung University

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

189 Scopus citations

Abstract

In a parallel-coupled microstrip filter, end stages with over-coupling are designed to suppress the unwanted responses at twice the passband frequency (2f_o). The inherent transmission zero of an over-coupled input/output stage is shown tunable. It is found that increasing the image impedance of the filter sections can further enhance the suppression. The designed bandpass filters thus have a wide upper stopband and improved passband response symmetry. Measured results of fabricated circuits show that the idea works very well.

Original language	English
Pages (from-to)	440-442
Number of pages	3
Journal	IEEE Microwave and Wireless Components Letters
Volume	13
Issue number	10
DOIs	https://doi.org/10.1109/LMWC.2003.818531
State	Published - 10 2003
Externally published	Yes

Keywords

Microstrip filter
Spurious response

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10.1109/LMWC.2003.818531

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abstract = "In a parallel-coupled microstrip filter, end stages with over-coupling are designed to suppress the unwanted responses at twice the passband frequency (2fo). The inherent transmission zero of an over-coupled input/output stage is shown tunable. It is found that increasing the image impedance of the filter sections can further enhance the suppression. The designed bandpass filters thus have a wide upper stopband and improved passband response symmetry. Measured results of fabricated circuits show that the idea works very well.",

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AB - In a parallel-coupled microstrip filter, end stages with over-coupling are designed to suppress the unwanted responses at twice the passband frequency (2fo). The inherent transmission zero of an over-coupled input/output stage is shown tunable. It is found that increasing the image impedance of the filter sections can further enhance the suppression. The designed bandpass filters thus have a wide upper stopband and improved passband response symmetry. Measured results of fabricated circuits show that the idea works very well.

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Parallel-coupled microstrip filters with over-coupled end stages for suppression of spurious responses

Abstract

Keywords

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