Abstract A circularly polarized (CP) CPW-fed (CoPlanar Waveguide) with two asymmetric U-shaped strips, patch antenna is described in this paper. The antenna consists of a radiating patch composed of a hexagonal-ring connected with two annular rings on the two corners, which provide wide CP. The CPW-fed antenna was constructed by etching out two L-shaped slots and adding two asymmetric U-shaped strips to the ground, which greatly enhanced both the impedance bandwidth (IBW) and axial ratio bandwidth (ARBW). The proposed antenna design yields a measured wide IBW = 5.637 GHz (4.484–10.121 GHz), which is about 80.53% with respect to the center frequency f c = 7.3 GHz. The simulated 3-dB axial ratio (AR) bandwidth for tri bands includes 95 MHz (1.37%), 186 MHz (2.35%) and 149 MHz (1.67%) resonating at 6.95, 7.93, and 8.91 GHz, respectively. The radiation characteristics of the implemented antenna have been analyzed and discussed in this paper. The maximum simulated peak gain is 5.968 dBi at 6.063 GHz. The proposed antenna can be suitable for C- and X-band wireless communication applications.

中文翻译：

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用于无线通信应用的三频圆极化单极天线

摘要 本文描述了一种圆极化(CP) CPW-fed (CoPlanar Waveguide) 具有两个不对称U 形条带的贴片天线。该天线由一个辐射贴片组成，该贴片由一个六角环与两个角上的两个环形环相连，提供宽的 CP。CPW馈电天线通过蚀刻两个L形槽并在地面上增加两个不对称U形条带构成，大大提高了阻抗带宽（IBW）和轴比带宽（ARBW）。建议的天线设计产生测量的宽 IBW = 5.637 GHz (4.484–10.121 GHz)，相对于中心频率 fc = 7.3 GHz 约为 80.53%。三频段的模拟 3-dB 轴比 (AR) 带宽包括分别在 6.95、7.93 和 8.91 GHz 谐振的 95 MHz (1.37%)、186 MHz (2.35%) 和 149 MHz (1.67%)。本文对实现的天线的辐射特性进行了分析和讨论。最大模拟峰值增益在 6.063 GHz 时为 5.968 dBi。建议的天线适用于 C 波段和 X 波段无线通信应用。