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Fractal Dual-Mode Open-Loop Quasi-Elliptic Bandpass Filter with Source-Load Coupling

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Abstract

To realize the feature of small size and high selectivity, a microstrip miniature fractal quasi-elliptic bandpass filter (BPF) with two transmission zeros (TZs) near each skirt is investigated in this paper. The TZs are created by source-load coupling between the input and output E-shaped feeding structures. By using a dual-mode Minkowski fractal shorted stub loaded open-loop resonator, the proposed BPF achieved a size reduction of 97.5% compared with the conventional square dual-mode loop BPF. Even mode analysis is adopted to characterize the Minkowski structure. The frequency responses of the current BPF were simulated and measured with good agreement.

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Acknowledgements

This work was supported by Tianjin Research Program of Application Foundation and Advanced Technology, China under Grant 14JCQNJC0110.

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Authors and Affiliations

  1. Institute of Antenna and Microwave Techniques, Tianjin University of Technology and Education, Tianjin, 300222, China

    Li-Ying Feng

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  1. Li-Ying Feng
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Correspondence to Li-Ying Feng.

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Feng, LY. Fractal Dual-Mode Open-Loop Quasi-Elliptic Bandpass Filter with Source-Load Coupling. Wireless Pers Commun 103, 1113–1120 (2018). https://doi.org/10.1007/s11277-017-5220-1

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  • DOI: https://doi.org/10.1007/s11277-017-5220-1

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