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Compact Dual-Mode Balun Bandpass Filter with Improved Out-of-Band Performance

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Abstract

A compact dual-mode balun bandpass filter with improved out-of-band performance is proposed based on a ring resonator. In order to excite the two degenerate modes and obtain filtering balun performance, three parallel-coupled lines are placed at three excitation ports along the ring resonator. By properly arranging the angles between the excitation arms, four transmission zeros can be realized to improve stopband performance. Finally, a prototype of the designed balun bandpass filter is implemented and fabricated. The measured results show a good agreement with those obtained from the simulation, thus verifying our proposal with good in-band filtering and out-of-band performance.

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Acknowledgement

This work was supported in part by the National Natural Science Foundation of China (NSFC) (61601063, 61971115), in part by State Key Laboratory of Millimeter Waves (K202121), Southeast University, China, in part by Key Laboratory of Pattern Recognition and Intelligent Information Processing, Institutions of Higher Education of Sichuan Province, Chengdu University, China (MSSB-2020-08), and in part by the Department of Science and Technology of Sichuan Province of China (2018JY0323).

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Authors and Affiliations

  1. School of Electronic Information and Electrical Engineering, Chengdu University, Chengdu, 610106, China

    Shan Shan Gao & Gang Yu Yi

  2. State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, 210096, China

    Shan Shan Gao

  3. Key Laboratory of Pattern Recognition and Intelligent Information Processing, Institutions of Higher Education of Sichuan Province, Chengdu University, Chengdu, 610106, China

    Shan Shan Gao

  4. School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China

    Sheng Sun

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  1. Shan Shan Gao
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  2. Gang Yu Yi
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  3. Sheng Sun
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Correspondence to Shan Shan Gao.

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Gao, S.S., Yi, G.Y. & Sun, S. Compact Dual-Mode Balun Bandpass Filter with Improved Out-of-Band Performance. J. Electr. Eng. Technol. 16, 1841–1844 (2021). https://doi.org/10.1007/s42835-021-00721-9

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  • DOI: https://doi.org/10.1007/s42835-021-00721-9

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