A novel planar omnidirectional circularly polarized (CP) antenna is presented. The omnidirectional circular polarization characteristics of the planar antenna are the result of the combined effect of a planar quasi-magnetic dipole (PQMD) and a printed electric dipole (PED) in this paper. The CP radiation pattern of the proposed antenna can be achieved by distributing appropriate current amplitude and phase to both elements, respectively. A power divider is used to adjust the amplitude and phase relationship between two basic components. In order to achieve a planar structure, coplanar waveguide (CPW) feed is adopted to feed the quasi-magnetic dipole for the first time. The overall electrical size of antenna is 1.61λ × 0.38λ. Finally, the correctness of our theoretical analysis is verified by processing and measuring this antenna. Through the analysis of the measurement results, we have obtained the following conclusions: the operating bandwidth of the proposed antenna obtained by measurement is from 5.67 to 5.86 GHz, in which the reflection coefficient is less than −10 dB and the axial ratio is less than 3 dB. Within the available bandwidth, the proposed antenna achieves omnidirectional radiation characteristics with a gain between 0.89 and 2.48 dBic.

中文翻译：

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CPW馈电平面全向圆极化天线的新颖设计

提出了一种新颖的平面全向圆极化（CP）天线。本文中平面天线的全向圆极化特性是平面准磁偶极子（PQMD）和印刷电偶极子（PED）共同作用的结果。可以通过分别向两个元件分配适当的电流幅度和相位来实现所提出天线的CP辐射方向图。功率分配器用于调整两个基本组件之间的幅度和相位关系。为了实现平面结构，首次采用共面波导（CPW）馈入准磁偶极子。的天线的总电尺寸是1.61 λ  ×0.38 λ。最后，通过处理和测量该天线来验证我们理论分析的正确性。通过对测量结果的分析，我们得出以下结论：通过测量获得的拟议天线的工作带宽为5.67至5.86 GHz，其中反射系数小于-10 dB，轴向比小于3分贝。在可用带宽内，拟议的天线实现了全向辐射特性，增益在0.89至2.48 dBic之间。