Enhanced microstrip filter design with a uniform dielectric overlay for suppressing the second harmonic response

Jen Tsai Kuo; Meshon Jiang

doi:10.1109/LMWC.2004.832068

Enhanced microstrip filter design with a uniform dielectric overlay for suppressing the second harmonic response

Jen Tsai Kuo^*, Meshon Jiang

^*Corresponding author for this work

National Yang Ming Chiao Tung University

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

37 Scopus citations

Abstract

Parallel-coupled microstrip filters are designed to suppress spurious response at twice the passband frequency (2f₀) with a uniform dielectric overlay. The overlay dielectric is used to equalize the modal phase velocities of each coupled stage. Based on the method, we have a large degree of freedom in choosing thickness and permittivity of the overlay dielectric. The image impedances of all the coupled stages in such a filter need adjusting to complete the filter synthesis. Two filters are fabricated and measured results show a good agreement with the simulation. A suppression of at least 40 dB to the spurious responses at 2f_o is achieved.

Original language	English
Pages (from-to)	419-421
Number of pages	3
Journal	IEEE Microwave and Wireless Components Letters
Volume	14
Issue number	9
DOIs	https://doi.org/10.1109/LMWC.2004.832068
State	Published - 09 2004
Externally published	Yes

Keywords

Microstrip filter
Overlay dielectric
Phase velocity equalization
Spurious response

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10.1109/LMWC.2004.832068

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abstract = "Parallel-coupled microstrip filters are designed to suppress spurious response at twice the passband frequency (2f0) with a uniform dielectric overlay. The overlay dielectric is used to equalize the modal phase velocities of each coupled stage. Based on the method, we have a large degree of freedom in choosing thickness and permittivity of the overlay dielectric. The image impedances of all the coupled stages in such a filter need adjusting to complete the filter synthesis. Two filters are fabricated and measured results show a good agreement with the simulation. A suppression of at least 40 dB to the spurious responses at 2fo is achieved.",

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AB - Parallel-coupled microstrip filters are designed to suppress spurious response at twice the passband frequency (2f0) with a uniform dielectric overlay. The overlay dielectric is used to equalize the modal phase velocities of each coupled stage. Based on the method, we have a large degree of freedom in choosing thickness and permittivity of the overlay dielectric. The image impedances of all the coupled stages in such a filter need adjusting to complete the filter synthesis. Two filters are fabricated and measured results show a good agreement with the simulation. A suppression of at least 40 dB to the spurious responses at 2fo is achieved.

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KW - Overlay dielectric

KW - Phase velocity equalization

KW - Spurious response

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JO - IEEE Microwave and Wireless Components Letters

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Enhanced microstrip filter design with a uniform dielectric overlay for suppressing the second harmonic response

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