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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 and Ke Wu

Article (2019)

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Cite this document: 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, p. 140631-140636. doi:10.1109/access.2019.2943605
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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 such a 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 a simple design. A prototype based on the substrate integrated coaxial line (SICL) is experimented showing an impressive stopband performance. Agreeing with the simulation well, the measured stopband is extended up to about 12 f0 with the suppression of 40 – 50 dB (f0 is the center frequency). The proposed technique could 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

Open Access document in PolyPublie
Subjects: 2500 Génie électrique et électronique > 2500 Génie électrique et électronique
2500 Génie électrique et électronique > 2520 Dispositifs, circuits et technologie hyperfréquences et d'ondes millimétriques
Department: Département de génie électrique
Research Center: POLY-GRAMES - Centre de recherche avancée en micro-ondes et en électronique spatiale
Funders: National Natural Science Foundation of China, RF Integration and Micro-Assembly Technology - National and Local Joint Engineering Laboratory
Grant number: 61601246, 61601242, KFJJ20170201
Date Deposited: 14 Jul 2021 11:20
Last Modified: 15 Jul 2021 01:20
PolyPublie URL: https://publications.polymtl.ca/4824/
Document issued by the official publisher
Journal Title: IEEE Access (vol. 7)
Publisher: IEEE
Official URL: https://doi.org/10.1109/access.2019.2943605

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