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<p>In this article, a&#xa0;novel design is used to reduce the size and remove the harmonics of the branch-line coupler. This design includes combinations of&#xa0;T, π&#xa0;models, and new cleaver-shaped resonators. First, a&#xa0;new structure is presented, and then the parameters of the model are obtained by using even and odd mode analysis. By using the proposed structure, in addition to the miniaturization of the coupler by using open circuit stubs, the 2nd&#xa0;to 9th&#xa0;harmonics have been removed. The central frequency of this coupler is 2.05 GHz, and its overall dimensions are 11.5 mm × 11.5 mm. Also, the −15 dB fractional bandwidth (FBW) of this coupler is 51.21%. According to the features mentioned for the presented coupler, this circuit can be used in modern communication systems.</p>

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A miniaturized branch-line coupler using new cleaver-shaped resonators with high FBW

  • 期刊论文

  • 发表日期：

    2025年1月29日

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  • Hongfei Luo,
  • Qingqing Song,
  • Songhong Lai

摘要

In this article, a novel design is used to reduce the size and remove the harmonics of the branch-line coupler. This design includes combinations of T, π models, and new cleaver-shaped resonators. First, a new structure is presented, and then the parameters of the model are obtained by using even and odd mode analysis. By using the proposed structure, in addition to the miniaturization of the coupler by using open circuit stubs, the 2nd to 9th harmonics have been removed. The central frequency of this coupler is 2.05 GHz, and its overall dimensions are 11.5 mm × 11.5 mm. Also, the −15 dB fractional bandwidth (FBW) of this coupler is 51.21%. According to the features mentioned for the presented coupler, this circuit can be used in modern communication systems.