volume | PIER Journals

2012-10-12

Compact Microstrip Bandpass Filters Using Triple-Mode Resonator

Ker Chia Lee,

Dr. Ker Chia Lee

School of Engineering, Computing and Science

Swinburne University of Technology (Sarawak Campus)

Malaysia

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Hieng Tiong Su,

Prof. Hieng Tiong Su

Engineering

Swinburne University of Technology (Sarawak Campus)

Malaysia

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Manas Kumar Haldar

Dr. Manas Kumar Haldar

School of Engineering, Computing and Science

Swinburne University of Technology (Sarawak Campus)

Malaysia

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Progress In Electromagnetics Research Letters, Vol. 35, 89-98, 2012

doi:10.2528/PIERL12090306

Abstract

Step-by-step procedures for designing a third order bandpass filter and a sixth order bandpass filter using a triple-mode resonator are described in this paper. The triple-mode resonator is a square open-loop resonator with an open circuited stepped-impedance stub and a grounding via located at the symmetrical plane of the resonator. The equations for approximating the resonant frequencies of the resonator are obtained from odd- and even-mode analysis. To design a filter, first, the theoretical resonant frequencies for the filter are calculated. Then the basic dimensions of the resonator are approximated using the equations. The filter layouts are fine-tuned by simulation and verified by experiment to conclude the paper. The first spurious response occurs at about 3 times the center frequency of the first passband in both filters. The simulated and measured results are in good agreement.

Citation

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Ker Chia Lee, Hieng Tiong Su, and Manas Kumar Haldar, "Compact Microstrip Bandpass Filters Using Triple-Mode Resonator," Progress In Electromagnetics Research Letters, Vol. 35, 89-98, 2012.
doi:10.2528/PIERL12090306

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