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A metasurface‐based wideband bidirectional same‐sense circularly polarized antenna


Niamat Hussain, Syeda I. Naqvi, Wahaj A. Awan, Tuan T. Le*

Source title: 
International Journal of RF and Microwave Computer-Aided Engineering, 2020 (ISI)
Academic year of acceptance: 

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.