A Novel Broadband Circularly Polarized Monopole Antenna
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摘要: 该文设计了一种新颖的宽带圆极化单极子天线，该天线采用微带馈电模式。天线由C型贴片和改进的地板组成，整个天线尺寸仅为25×25×1 mm3。通过在C型贴片上切角和在地板上增加三角形微扰结构，可以有效增加天线的阻抗带宽和轴比带宽。该文给出了天线的设计流程，从表面电流分布分析了圆极化天线的工作机理。加工了天线实物，并对其进行了测量。仿真和实测结果表明天线具有超宽的阻抗带宽和轴比带宽。天线的工作频带为4.35～12 GHz(相对带宽为93.6%)，3 dB轴比带宽为4.15～11.8 GHz(相对带宽为95.9%)。测量了天线的辐射性能和增益特性，实测结果与仿真结果吻合较好，证明了该天线的有效性。该天线可以应用于超宽带无线通信系统和卫星通信系统中。Abstract: A novel broadband circularly polarized monopole antenna is proposed by microstrip feed line. The antenna is composed of C-shaped patch and an improved ground plane with the overall size of 25×25×1 mm3. The impedance bandwidth and axial ratio bandwidth of the antenna can be effectively widened by cutting the corner on the C-shaped patch and adding triangular stubs on the ground plane. The design procedure of the antenna is given, and the working mechanism of the circularly polarized antenna is analyzed from the surface current distributions. Besides, the antenna is fabricated and measured. Simulated and measured results show that the antenna has ultra wide impedance bandwidth and axial ratio bandwidth. The operating bandwidth of the antenna is 4.35～12 GHz (relative bandwidth 93.6%), and the 3 dB axial ratio bandwidth is 4.15～11.8 GHz (relative bandwidth 95.9%). At the same time, the radiation performance and gain characteristics of the antenna are measured and the measured results are in good agreement with the simulated results, which proves the effectiveness of the antenna. The antenna can be applied to Ultra-WideBand (UWB) wireless communication systems and satellite communication systems.
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Key words:
- Monopole antenna /
- Axial ratio /
- Ultra WideBand (UWB) /
- Circularly polarized
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表 1 优化后的天线单元尺寸(mm)
L L1 L2 L3 L4 L5 L6 25.0 6.0 2.5 2.6 2.86 5.45 5.0 W W1 Wf R R1 d 25.0 9.0 3.0 9.0 6.0 1.2 
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