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<p>This paper presents a small, butterfly-shaped, circularly polarized antenna of dimensions 7.1&#xa0;×&#xa0;8.6&#xa0;mm<sup>2</sup> using coplanar waveguide feed. This proposed dual-band antenna has applications in both Ku and K bands with a broader 3-dB axial ratio bandwidth. In this novel approach, using Rogers RO3003 as a dielectric with a thickness of 0.254&#xa0;mm, circular polarization in K and Ku bands is achieved by adding two diagonally asymmetrical stubs and a grounded inverted-L slot in the coplanar waveguide feed ground plane, respectively. In this antenna, the rectangular patch and ground are on the same side of the substrate. Antenna design is developed using the CST MW Studio software, and the validity of the results is confirmed through experimentation in the laboratory by physically constructing the antenna. The results show that the 3-dB axial ratio bandwidth is 55% [11.4–18.1 GHz, 12.2 GHz] and 17% [21.2–25.2 GHz, 23.5 GHz], while the 10-dB impedance bandwidth is 66.44% [10.1–18.4 GHz, 12.5 GHz] and 22.44% [22.5–28 GHz, 24.5 GHz] for Ku and K bands, respectively. Furthermore, this antenna provides a peak gain of 5&#xa0;dB and 6&#xa0;dB in Ku and K bands, respectively.</p>

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Design of a novel compact butterfly-shaped circularly polarized antenna for Ku and K band applications

  • 期刊论文

  • 发表日期：

    2025年3月27日

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  • Renu Agrawal,
  • Subhash Shrimal,
  • Indra Bhooshan Sharma,
  • Bhawna Kalra,
  • M M Sharma

摘要

This paper presents a small, butterfly-shaped, circularly polarized antenna of dimensions 7.1 × 8.6 mm2 using coplanar waveguide feed. This proposed dual-band antenna has applications in both Ku and K bands with a broader 3-dB axial ratio bandwidth. In this novel approach, using Rogers RO3003 as a dielectric with a thickness of 0.254 mm, circular polarization in K and Ku bands is achieved by adding two diagonally asymmetrical stubs and a grounded inverted-L slot in the coplanar waveguide feed ground plane, respectively. In this antenna, the rectangular patch and ground are on the same side of the substrate. Antenna design is developed using the CST MW Studio software, and the validity of the results is confirmed through experimentation in the laboratory by physically constructing the antenna. The results show that the 3-dB axial ratio bandwidth is 55% [11.4–18.1 GHz, 12.2 GHz] and 17% [21.2–25.2 GHz, 23.5 GHz], while the 10-dB impedance bandwidth is 66.44% [10.1–18.4 GHz, 12.5 GHz] and 22.44% [22.5–28 GHz, 24.5 GHz] for Ku and K bands, respectively. Furthermore, this antenna provides a peak gain of 5 dB and 6 dB in Ku and K bands, respectively.