This article presents a wideband bidirectional same‐sense circularly polarized (CP) antenna based on metasurface structure. The antenna consists of a rectangular slot and two identical layers of periodic metallic plates as metasurfaces (MSs). The MS structure is formed by 16 unit cells of truncated‐corner patches arranged in 4 × 4 configuration. For bidirectional beam realization, the MSs are positioned on both the front and back sides of the primary radiating slot. In the proposed design, the MSs act as a polarization conversion structures, which convert the linearly polarized wave produced by the rectangular slot to the CP wave. The final antenna has a profile of 0.13λ _o and lateral dimensions of 0.86λ _o × 0.67λ _o at the center operating frequency. Measurements show that the proposed design radiates left‐hand CP radiation for both front and back directions over wide operating bandwidth of 14.3% (5.2‐6.0 GHz). In addition, the average gain value is about 4.2 dBi and the radiation efficiency is always better than 83% across the operating band. To the best of authors' knowledge, the proposed one shows a state‐of‐the‐art operating bandwidth in comparison with other reported designs.

中文翻译：

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基于超表面的宽带双向同感圆极化天线

本文介绍了一种基于超表面结构的宽带双向同感圆极化（CP）天线。天线由一个矩形缝隙和两个相同的周期性金属板层组成，作为超颖表面（MSs）。MS结构由以4×4配置排列的16个截角形贴片单元单元形成。为了实现双向光束，MS定位在主辐射槽的正面和背面。在建议的设计中，MS充当偏振转换结构，将矩形缝隙产生的线性偏振波转换为CP波。最终的天线具有0.13的轮廓λ _ö和0.86横向尺寸λ _ö  ×0.67 λ _ö 在中心工作频率。测量表明，建议的设计在14.3％（5.2-6.0 GHz）的宽工作带宽上向左右两个方向辐射左CP辐射。此外，平均增益值约为4.2 dBi，在整个工作频段内的辐射效率始终优于83％。据作者所知，与其他报告的设计相比，拟议中的技术显示了最新的工作带宽。