A novel wideband magnetoelectric (ME) dipole antenna with dual circular polarization and unidirectional radiation is proposed in this letter. The proposed antenna is based on two perpendicular sub-ME dipoles realized by four V-shaped patches and four V-section columns, and each of them is composed of an electric dipole and a magnetic dipole in parallel. Fed by two simple Γ-shaped feeds, 90° phase difference between the electric dipole and the magnetic dipole in each of the sub-ME dipoles is achieved, hence the dual-circularly polarized radiation is generated. Wide impedance bandwidth is obtained in virtue of the two kinds of dipoles being excited simultaneously. The 3 dB axial-ratio (AR) bandwidth is enlarged by optimizing the V-section columns and a circular cavity. Besides, the port isolation is apparently enhanced by adding slits on the patches and elaborating different spacings between each feed and its two-sided columns. Measured results show that the proposed antenna has many appealing properties, such as a unidirectional radiation pattern, an impedance bandwidth (reflection coefficients ≤–10 dB and port isolation ≥ 10 dB) of 51.1% and a 3 dB AR bandwidth of 41.9%.

中文翻译：

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使用磁电偶极子开发具有简单馈电的宽带双圆极化天线

在这封信中提出了一种具有双圆极化和单向辐射的新型宽带磁电 (ME) 偶极天线。所提出的天线基于由四个 V 形贴片和四个 V 形截面柱实现的两个垂直子 ME 偶极子，每个子极子由平行的电偶极子和磁偶极子组成。通过两个简单的Γ形馈源馈电，实现了每个sub-ME偶极子中的电偶极子和磁偶极子之间的90°相位差，从而产生了双圆极化辐射。由于两种偶极子同时被激发，因此获得了较宽的阻抗带宽。通过优化 V 形截面柱和圆形腔，扩大了 3 dB 轴比 (AR) 带宽。除了，通过在贴片上添加狭缝并在每个馈电及其两侧列之间制定不同的间距，显然增强了端口隔离。测量结果表明，所提出的天线具有许多吸引人的特性，例如单向辐射模式、51.1% 的阻抗带宽（反射系数≤–10 dB 和端口隔离度≥ 10 dB）和 3 dB 的 AR 带宽为 41.9%。