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This paper presents a novel design method for a single feed circularly polarized microstrip antenna. The key feature of the antenna design is the coupling feeding of a microstrip feeder with an angled cut and slot radiation patch, as well as the composite construction of a square ring with an inner cut angle and two symmetrical rectangular branches connected to the feed microstrip line. Experimental results demonstrate that within the frequency range of 2.59 GHz–3.18 GHz, S11 remains below −10 dB, achieving a relative bandwidth of 21.85%. The axial ratio remains below 3 dB between 2.92 GHz–2.97 GHz, resulting in a circular polarization bandwidth of 1.70% and outstanding left-handed circular polarization (LHCP) performance. The antenna exhibits strong directivity within its operational band and a gain of 3.45 dBi. Furthermore, it features a compact size and simple processing, offering new insights for research and design in S-band circular polarized antennas.

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Design of a Novel Circularly Polarized Microstrip Antenna with Tangential Square Ring

  • 会议论文

  • 发表日期：

    2025年

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  • Yuan Cao,
  • Bin Lin,
  • Songfeng Yin,
  • Baicheng Zhang

摘要

This paper presents a novel design method for a single feed circularly polarized microstrip antenna. The key feature of the antenna design is the coupling feeding of a microstrip feeder with an angled cut and slot radiation patch, as well as the composite construction of a square ring with an inner cut angle and two symmetrical rectangular branches connected to the feed microstrip line. Experimental results demonstrate that within the frequency range of 2.59 GHz–3.18 GHz, S11 remains below −10 dB, achieving a relative bandwidth of 21.85%. The axial ratio remains below 3 dB between 2.92 GHz–2.97 GHz, resulting in a circular polarization bandwidth of 1.70% and outstanding left-handed circular polarization (LHCP) performance. The antenna exhibits strong directivity within its operational band and a gain of 3.45 dBi. Furthermore, it features a compact size and simple processing, offering new insights for research and design in S-band circular polarized antennas.