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Wide stopband bandpass filter implemented by stepped impedance resonator and multiple in-resonator open stubs

Peng Chu, Lei Guo, Long Zhang, Ke Wu

Article (2019)

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Abstract

Stepped impedance resonator (SIR) has been widely used for applications in wide stopband bandpass filters. However, the reported SIR wide stopband bandpass filters are limited in either stopband performance or design complexity. Here we propose an approach to improve the stopband performance and reduce the design complexity simultaneously. Two in-resonator open stubs are adopted in a SIR (with tap-feeding) to stagger the frequencies of higher-order modes (compared with other SIR) and produce two adjustable transmission zeros without affecting the fundamental properties. For a SIR filter employing sucha structure, the spurious passbands are doubly deteriorated by the staggering and up to four transmission zeros. At the same time, the fundamental passband is not affected, which significantly reduces the design complexity. As a result, not only wide stopband but also high-suppression stopband can be obtained in asimple design. A prototype based on the substrate integrated coaxial line (SICL) is experimented showingan impressive stopband performance. Agreeing with the simulation well, the measured stopband is extendedup to about 12 f0 with the suppression of 40 – 50 dB (f0 is the center frequency). The proposed techniquecould be very useful to design a bandpass filter with a wide and high-suppression stopband efficiently.

Uncontrolled Keywords

Bandpass filter, open stub, substrate integrated coaxial line (SICL), stepped impedance resonator (SIR), wide stopband

Subjects: 2500 Electrical and electronic engineering > 2500 Electrical and electronic engineering
2500 Electrical and electronic engineering > 2520 Microwave and millimeter-wave devices, circuits and technologies
Department: Department of Electrical Engineering
Research Center: POLY-GRAMES - Advanced Research Centre in Microwaves and Space Electronics
Funders: National Natural Science Foundation of China, RF Integration and Micro-Assembly Technology - National and Local Joint Engineering Laboratory
Grant number: 61601246, 61601242, KFJJ20170201
PolyPublie URL: https://publications.polymtl.ca/4824/
Journal Title: IEEE Access (vol. 7)
Publisher: IEEE
DOI: 10.1109/access.2019.2943605
Official URL: https://doi.org/10.1109/access.2019.2943605
Date Deposited: 14 Jul 2021 11:20
Last Modified: 10 Nov 2022 08:54
Cite in APA 7: Chu, P., Guo, L., Zhang, L., & Wu, K. (2019). Wide stopband bandpass filter implemented by stepped impedance resonator and multiple in-resonator open stubs. IEEE Access, 7, 140631-140636. https://doi.org/10.1109/access.2019.2943605

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