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<p>A four-arm sinuous antenna which is suitable for satellite and military telecommunication operations is designed with wideband frequency operations in consideration. Its frequency range is 0.4&#xa0;GHz to 5&#xa0;GHz. The distinctive spiral design of the sinuous antenna provides substantial benefits with regard to overall frequency independence, enabling consistent performance over a wide range. An FR4 substrate has been chosen for the antenna's design considering its cost-effectiveness and favourable dielectric attributes. The substrate provides an ideal compromise between its strength and electrical performance with an overall thickness of 0.8&#xa0;mm and a dielectric constant of 4.4. In order to obtain the requisite wideband characteristics while keeping a compact form factor, the antenna's diameter is chosen at 50&#xa0;mm. The four-arm sinuous design ensures resonance at different frequencies within the designated range, allowing for consistent radiation patterns and effective impedance matching. Achieving a lower input impedance of 50 ohms, which greatly enhances impedance matching, together with high gain and a broader bandwidth, is the design's main novelty and also feed of balun structure is another&#xa0;breakthrough. The antenna has a broad bandwidth of 4.6&#xa0;GHz and operates in the frequency range of 0.4 to 5&#xa0;GHz. By effectively converting the balanced signal from the antenna to the unbalanced feed line, the wideband balun structure improves the antenna's performance even further. In addition to reducing signal reflection and increasing overall radiation efficiency, this also improves the VSWR. Simulations&#xa0;are used to assess the planned antenna's performance, including comparisons of various input impedances. Radiation efficiency, gain, VSWR, and return loss are measured in HFSS software to verify the antenna's functionality and feasibility for UWB applications. Furthermore, the sinuous antenna is a promising option for next-generation satellite communication systems due to its broad gain bandwidth and polarization variety.</p>

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Wideband Frequency Independent Four Arm Sinuous Antenna for Satellite Communication

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • R. Shantha Selvakumari,
  • V. Guruarchana

摘要

A four-arm sinuous antenna which is suitable for satellite and military telecommunication operations is designed with wideband frequency operations in consideration. Its frequency range is 0.4 GHz to 5 GHz. The distinctive spiral design of the sinuous antenna provides substantial benefits with regard to overall frequency independence, enabling consistent performance over a wide range. An FR4 substrate has been chosen for the antenna's design considering its cost-effectiveness and favourable dielectric attributes. The substrate provides an ideal compromise between its strength and electrical performance with an overall thickness of 0.8 mm and a dielectric constant of 4.4. In order to obtain the requisite wideband characteristics while keeping a compact form factor, the antenna's diameter is chosen at 50 mm. The four-arm sinuous design ensures resonance at different frequencies within the designated range, allowing for consistent radiation patterns and effective impedance matching. Achieving a lower input impedance of 50 ohms, which greatly enhances impedance matching, together with high gain and a broader bandwidth, is the design's main novelty and also feed of balun structure is another breakthrough. The antenna has a broad bandwidth of 4.6 GHz and operates in the frequency range of 0.4 to 5 GHz. By effectively converting the balanced signal from the antenna to the unbalanced feed line, the wideband balun structure improves the antenna's performance even further. In addition to reducing signal reflection and increasing overall radiation efficiency, this also improves the VSWR. Simulations are used to assess the planned antenna's performance, including comparisons of various input impedances. Radiation efficiency, gain, VSWR, and return loss are measured in HFSS software to verify the antenna's functionality and feasibility for UWB applications. Furthermore, the sinuous antenna is a promising option for next-generation satellite communication systems due to its broad gain bandwidth and polarization variety.